NetBSD-5.0.2/sbin/badsect/badsect.c
/* $NetBSD: badsect.c,v 1.30 2008/07/20 01:20:21 lukem Exp $ */
/*
* Copyright (c) 1981, 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1981, 1983, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)badsect.c 8.2 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: badsect.c,v 1.30 2008/07/20 01:20:21 lukem Exp $");
#endif
#endif /* not lint */
/*
* badsect
*
* Badsect takes a list of file-system relative sector numbers
* and makes files containing the blocks of which these sectors are a part.
* It can be used to contain sectors which have problems if these sectors
* are not part of the bad file for the pack (see bad144). For instance,
* this program can be used if the driver for the file system in question
* does not support bad block forwarding.
*/
#include <sys/param.h>
#include <sys/dir.h>
#include <sys/stat.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>
static union {
struct fs fs;
char fsx[SBLOCKSIZE];
} ufs;
#define sblock ufs.fs
static union {
struct cg cg;
char cgx[MAXBSIZE];
} ucg;
#define acg ucg.cg
static struct fs *fs;
static int fsi;
static int errs;
static off_t dev_bsize = 1;
static int needswap = 0;
static int is_ufs2;
static void rdfs(off_t, size_t, void *);
static int chkuse(daddr_t, int);
int main(int, char *[]);
static const off_t sblock_try[] = SBLOCKSEARCH;
int
main(int argc, char *argv[])
{
daddr_t number;
struct stat stbuf, devstat;
struct direct *dp;
int i, did = 0;
DIR *dirp;
char name[MAXPATHLEN];
size_t dl = sizeof(_PATH_DEV);
if (argc < 3) {
(void)fprintf(stderr, "usage: %s bbdir blkno [ blkno ]\n",
getprogname());
exit(1);
}
if (chdir(argv[1]) == -1)
err(1, "Cannot change directory to `%s'", argv[1]);
if (stat(".", &stbuf) == -1)
err(1, "Cannot stat `%s'", argv[1]);
(void)strlcpy(name, _PATH_DEV, sizeof(name));
if ((dirp = opendir(name)) == NULL)
err(1, "Cannot opendir `%s'", argv[1]);
while ((dp = readdir(dirp)) != NULL) {
(void)strlcpy(name + dl - 1, dp->d_name, sizeof(name) - dl + 1);
if (stat(name, &devstat) == -1)
err(1, "Cannot stat `%s'", name);
if (stbuf.st_dev == devstat.st_rdev &&
S_ISBLK(devstat.st_mode))
break;
}
if (dp == NULL)
errx(1, "Cannot find dev 0%o corresponding to %s",
stbuf.st_rdev, argv[1]);
/*
* The filesystem is mounted; use the character device instead.
* XXX - Assume that prepending an `r' will give us the name of
* the character device.
*/
name[dl - 1] = 'r';
(void)strlcpy(name + dl, dp->d_name, sizeof(name) - dl);
(void)closedir(dirp); /* now *dp is invalid */
if ((fsi = open(name, O_RDONLY)) == -1)
err(1, "Cannot open `%s'", argv[1]);
fs = &sblock;
for (i = 0; ; i++) {
if (sblock_try[i] == -1)
errx(1, "%s: bad superblock", name);
rdfs(sblock_try[i], SBLOCKSIZE, fs);
switch (fs->fs_magic) {
case FS_UFS2_MAGIC:
is_ufs2 = 1;
/* FALLTHROUGH */
case FS_UFS1_MAGIC:
break;
case FS_UFS2_MAGIC_SWAPPED:
is_ufs2 = 1;
/* FALLTHROUGH */
case FS_UFS1_MAGIC_SWAPPED:
needswap = 1;
ffs_sb_swap(fs, fs);
break;
default:
continue;
}
/* Ensure we don't use 1st alternate if ffsv1 and bs=64k */
if (is_ufs2 || fs->fs_old_flags & FS_FLAGS_UPDATED) {
if (fs->fs_sblockloc != sblock_try[i])
continue;
} else {
if (sblock_try[i] == SBLOCK_UFS2)
continue;
}
break;
}
dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
number = atoi(*argv);
if (chkuse(number, 1))
continue;
if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
(dev_t)dbtofsb(fs, number)) == -1) {
warn("Cannot mknod `%s'", *argv);
errs++;
continue;
}
did++;
}
if (did)
warnx("Don't forget to run `fsck %s'", name);
else
warnx("File system `%s' was not modified", name);
return errs;
}
static int
chkuse(off_t blkno, int cnt)
{
int cg;
off_t fsbn, bn, fsbe;
fsbn = dbtofsb(fs, blkno);
fsbe = fsbn + cnt;
if (fsbe > fs->fs_size) {
warnx("block %lld out of range of file system",
(long long)blkno);
return 1;
}
cg = (int)dtog(fs, fsbn);
if (fsbn < cgdmin(fs, cg)) {
if (cg == 0 || fsbe > cgsblock(fs, cg)) {
warnx("block %lld in superblock area: cannot attach",
(long long)blkno);
return 1;
}
} else {
if (fsbe > cgbase(fs, cg + 1)) {
warnx("block %lld in beyond end of cylinder group: "
"cannot attach", (long long)blkno);
return 1;
}
}
rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize, &acg);
if (!cg_chkmagic(&acg, needswap)) {
warnx("cg %d: bad magic number", cg);
errs++;
return 1;
}
bn = dtogd(fs, fsbn);
if (isclr(cg_blksfree(&acg, needswap), bn))
warnx("Warning: sector %lld is in use", (long long)blkno);
return 0;
}
/*
* read a block from the file system
*/
static void
rdfs(off_t bno, size_t size, void *bf)
{
int n;
if (lseek(fsi, bno * dev_bsize, SEEK_SET) == -1)
err(1, "seek error at block %lld", (long long)bno);
switch (n = read(fsi, bf, size)) {
case -1:
err(1, "read error at block %lld", (long long)bno);
break;
default:
if (n == size)
return;
errx(1, "incomplete read at block %lld", (long long)bno);
}
}