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freebsd/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");
Reduce diffs with code in Perforce: Parenthesise return values.
2003-06-09 09:32:29 +00:00
return (-1);
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 (fs->fs_magic == FS_UFS1_MAGIC)
disk->d_ufs = 1;
Clean up error reporting in block.c, so that it gives honest error strings for the sorts of errors we run into[1]. This also gives us room to put in a vaguely appropriate casts to silence warnings since our compiler doesn't like when we compare ssize_t to size_t[2]. Add a cast in sblock.c[3] to silence a warning because of signed vs. size_t hell (again). Clean up nearby excessive parenthemutilation[4]. Reviewed by: bde [2] [3] Suggested by: bde, many [1] Submitted by: bde [4] An aside about [4], bde notes that we do not check for a negative value for the fs bsize. I'm nto going to do that in every situation we use it, one must expect a reasonable program to pass down reasonable values. Some foot shooting protection I will tolerate, some I will not. Also he suggests some possible conditional improvements there, which I may take to heart. PS: For me at least, this is now WARNS=5 clean...
2003-02-19 00:32:48 +00:00
if (fs->fs_magic == FS_UFS2_MAGIC &&
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;
Clean up error reporting in block.c, so that it gives honest error strings for the sorts of errors we run into[1]. This also gives us room to put in a vaguely appropriate casts to silence warnings since our compiler doesn't like when we compare ssize_t to size_t[2]. Add a cast in sblock.c[3] to silence a warning because of signed vs. size_t hell (again). Clean up nearby excessive parenthemutilation[4]. Reviewed by: bde [2] [3] Suggested by: bde, many [1] Submitted by: bde [4] An aside about [4], bde notes that we do not check for a negative value for the fs bsize. I'm nto going to do that in every situation we use it, one must expect a reasonable program to pass down reasonable values. Some foot shooting protection I will tolerate, some I will not. Also he suggests some possible conditional improvements there, which I may take to heart. PS: For me at least, this is now WARNS=5 clean...
2003-02-19 00:32:48 +00:00
if (fs->fs_bsize <= MAXBSIZE &&
(size_t)fs->fs_bsize >= sizeof(*fs)) {
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 (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;
Reduce diffs with code in Perforce: Parenthesise return values.
2003-06-09 09:32:29 +00:00
return (-1);
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_bsize = fs->fs_fsize / fsbtodb(fs, 1);
disk->d_sblock = superblock / disk->d_bsize;
Reduce diffs with code in Perforce: Parenthesise return values.
2003-06-09 09:32:29 +00:00
return (0);
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
}
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");
Reduce diffs with code in Perforce: Parenthesise return values.
2003-06-09 09:32:29 +00:00
return (-1);
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 (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");
Reduce diffs with code in Perforce: Parenthesise return values.
2003-06-09 09:32:29 +00:00
return (-1);
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
}
}
Reduce diffs with code in Perforce: Parenthesise return values.
2003-06-09 09:32:29 +00:00
return (0);
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
}
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