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freebsd-nq/lib/libufs/sblock.c

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Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
/*
* Copyright (c) 2002 Juli Mallett. All rights reserved.
*
* This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
* FreeBSD project. Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that the following
* conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/disklabel.h>
#include <sys/stat.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <libufs.h>
static int superblocks[] = SBLOCKSEARCH;
int
sbread(struct uufsd *disk)
{
struct fs *fs;
int sb, superblock;
Nuke dumb error reporting code, people can just use disk::d_error. Unify the DEBUG and d_error initialisation into an ERROR macro, which can both trace and set the d_error field. Much a more meaningful thing, I should say.
2003-01-18 04:22:14 +00:00
ERROR(disk, NULL);
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
fs = &disk->d_fs;
superblock = superblocks[0];
for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) {
Nuke dumb error reporting code, people can just use disk::d_error. Unify the DEBUG and d_error initialisation into an ERROR macro, which can both trace and set the d_error field. Much a more meaningful thing, I should say.
2003-01-18 04:22:14 +00:00
ERROR(disk, "non-existent or truncated superblock");
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
return -1;
}
if (fs->fs_magic == FS_UFS1_MAGIC)
disk->d_ufs = 1;
if ((fs->fs_magic == FS_UFS2_MAGIC) &&
Create a new 32-bit fs_flags word in the superblock. Add code to move 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.
2002-11-27 02:18:58 +00:00
(fs->fs_sblockloc == superblock))
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
disk->d_ufs = 2;
if ((fs->fs_bsize <= MAXBSIZE) &&
(fs->fs_bsize >= sizeof(*fs))) {
if (disk->d_ufs)
break;
}
disk->d_ufs = 0;
}
if (superblock == -1 || disk->d_ufs == 0) {
/*
* Other error cases will result in errno being set, here we
* must set it to indicate no superblock could be found with
* which to associate this disk/filesystem.
*/
Nuke dumb error reporting code, people can just use disk::d_error. Unify the DEBUG and d_error initialisation into an ERROR macro, which can both trace and set the d_error field. Much a more meaningful thing, I should say.
2003-01-18 04:22:14 +00:00
ERROR(disk, "no usable known superblock found");
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
errno = ENOENT;
return -1;
}
disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1);
disk->d_sblock = superblock / disk->d_bsize;
return 0;
}
int
sbwrite(struct uufsd *disk, int all)
{
struct fs *fs;
bwrite, not sbwrite, needs to open for writing and write.
2003-01-23 23:58:22 +00:00
int i;
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
Nuke dumb error reporting code, people can just use disk::d_error. Unify the DEBUG and d_error initialisation into an ERROR macro, which can both trace and set the d_error field. Much a more meaningful thing, I should say.
2003-01-18 04:22:14 +00:00
ERROR(disk, NULL);
In getino, have our DEBUG message in the unhandled case mention that it does not know what sort of UFS filesystem this is. Add some DEBUG(NULL)'s to function entry points.
2002-07-01 18:19:20 +00:00
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
fs = &disk->d_fs;
If we don't know where the sblock is (e.g. filling out a blank disk), then 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.
2003-01-27 01:57:15 +00:00
if (!disk->d_sblock) {
disk->d_sblock = disk->d_fs.fs_sblockloc / disk->d_bsize;
}
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) {
Nuke dumb error reporting code, people can just use disk::d_error. Unify the DEBUG and d_error initialisation into an ERROR macro, which can both trace and set the d_error field. Much a more meaningful thing, I should say.
2003-01-18 04:22:14 +00:00
ERROR(disk, "failed to write superblock");
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
return -1;
}
if (all) {
for (i = 0; i < fs->fs_ncg; i++)
if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)),
fs, SBLOCKSIZE) == -1) {
Nuke dumb error reporting code, people can just use disk::d_error. Unify the DEBUG and d_error initialisation into an ERROR macro, which can both trace and set the d_error field. Much a more meaningful thing, I should say.
2003-01-18 04:22:14 +00:00
ERROR(disk, "failed to update a superblock");
Add libufs, a library for dealing with UFS filesystems from userland to the build. It is here to compartmentalise functionality currently duplicated in many notable programs in the base system. It currently handles block reads and writes, as well as reading and writing of the filesystem superblock, and the reading/lookup of inode data. It supports both UFS and UFS2. I will be maintaining it, and porting programs to use it, however for now, it is simply being built as part of world.
2002-07-01 01:45:03 +00:00
return -1;
}
}
return 0;
}
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