fe8b86a06d
get it from the fs structure. Really libufs should have interfaces to generate both what we export, and what we import, based on eachother, and this should be full of redundant code to make sure everything is right... But really, we don't even deal with checksums, so plenty of room to improve.
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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* Copyright (c) 2002 Juli Mallett. All rights reserved.
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*
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* This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
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* FreeBSD project. Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the following
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* conditions are met:
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*
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* 1. Redistribution of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistribution in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <sys/disklabel.h>
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#include <sys/stat.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <libufs.h>
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static int superblocks[] = SBLOCKSEARCH;
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int
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sbread(struct uufsd *disk)
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{
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struct fs *fs;
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int sb, superblock;
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ERROR(disk, NULL);
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fs = &disk->d_fs;
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superblock = superblocks[0];
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for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
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if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) {
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ERROR(disk, "non-existent or truncated superblock");
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return -1;
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}
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if (fs->fs_magic == FS_UFS1_MAGIC)
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disk->d_ufs = 1;
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if ((fs->fs_magic == FS_UFS2_MAGIC) &&
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(fs->fs_sblockloc == superblock))
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disk->d_ufs = 2;
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if ((fs->fs_bsize <= MAXBSIZE) &&
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(fs->fs_bsize >= sizeof(*fs))) {
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if (disk->d_ufs)
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break;
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}
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disk->d_ufs = 0;
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}
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if (superblock == -1 || disk->d_ufs == 0) {
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/*
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* Other error cases will result in errno being set, here we
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* must set it to indicate no superblock could be found with
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* which to associate this disk/filesystem.
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*/
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ERROR(disk, "no usable known superblock found");
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errno = ENOENT;
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return -1;
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}
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disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1);
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disk->d_sblock = superblock / disk->d_bsize;
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return 0;
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}
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int
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sbwrite(struct uufsd *disk, int all)
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{
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struct fs *fs;
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int i;
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ERROR(disk, NULL);
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fs = &disk->d_fs;
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if (!disk->d_sblock) {
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disk->d_sblock = disk->d_fs.fs_sblockloc / disk->d_bsize;
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}
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if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) {
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ERROR(disk, "failed to write superblock");
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return -1;
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}
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if (all) {
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for (i = 0; i < fs->fs_ncg; i++)
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if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)),
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fs, SBLOCKSIZE) == -1) {
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ERROR(disk, "failed to update a superblock");
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return -1;
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}
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}
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return 0;
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}
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