0b72fdc81b
superblock. Submitted by: kkenn Can't use it verbatim, at least I hate to, as the ", skipped" bit doesn't make much sense in a library, to me.
130 lines
3.5 KiB
C
130 lines
3.5 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 <fcntl.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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DEBUG(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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disk->d_error = "non-existent or truncated superblock";
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DEBUG(NULL);
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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 == numfrags(fs, 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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DEBUG("no superblock found");
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disk->d_error = "no 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, rofd;
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DEBUG(NULL);
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fs = &disk->d_fs;
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rofd = disk->d_fd;
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disk->d_fd = open(disk->d_name, O_WRONLY);
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if (disk->d_fd < 0) {
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DEBUG("open");
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disk->d_error = "failed to open disk";
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return -1;
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}
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if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) {
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DEBUG(NULL);
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disk->d_error = "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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DEBUG(NULL);
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disk->d_error = "failed to update a superblock";
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return -1;
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}
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}
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close(disk->d_fd);
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disk->d_fd = rofd;
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return 0;
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}
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