ada981b228
the old 8-bit fs_old_flags to the new location the first time that the filesystem is mounted by a new kernel. One of the unused flags in fs_old_flags is used to indicate that the flags have been moved. Leave the fs_old_flags word intact so that it will work properly if used on an old kernel. Change the fs_sblockloc superblock location field to be in units of bytes instead of in units of filesystem fragments. The old units did not work properly when the fragment size exceeeded the superblock size (8192). Update old fs_sblockloc values at the same time that the flags are moved. Suggested by: BOUWSMA Barry <freebsd-misuser@netscum.dyndns.dk> Sponsored by: DARPA & NAI Labs.
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 == 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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