191 lines
5.3 KiB
C
191 lines
5.3 KiB
C
/* $OpenBSD: badsect.c,v 1.29 2022/10/12 23:11:32 krw Exp $ */
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/* $NetBSD: badsect.c,v 1.10 1995/03/18 14:54:28 cgd Exp $ */
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/*
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* Copyright (c) 1981, 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions 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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* badsect
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*
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* Badsect takes a list of file-system relative sector numbers
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* and makes files containing the blocks of which these sectors are a part.
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* It can be used to contain sectors which have problems. For instance,
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* this program can be used if the driver for the file system in question
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* does not support bad block forwarding.
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*/
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#include <sys/param.h> /* MAXBSIZE DEV_BSIZE isclr */
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#include <sys/stat.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ufs/dinode.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <limits.h>
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#include <err.h>
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static int chkuse(daddr_t, int);
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static void rdfs(daddr_t, int, char *);
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static union {
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struct fs fs;
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char fsx[SBSIZE];
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} ufs;
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#define sblock ufs.fs
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static union {
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struct cg cg;
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char cgx[MAXBSIZE];
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} ucg;
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#define acg ucg.cg
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static struct fs *fs;
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static int fsi;
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static int errs;
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int
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main(int argc, char *argv[])
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{
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daddr_t number;
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struct stat stbuf, devstat;
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struct dirent *dp;
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DIR *dirp;
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char name[BUFSIZ];
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int len;
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if (argc < 3) {
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fprintf(stderr, "usage: badsect bbdir sector ...\n");
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exit(1);
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}
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if (chdir(argv[1]) == -1 || stat(".", &stbuf) == -1)
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err(2, "%s", argv[1]);
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strlcpy(name, _PATH_DEV, sizeof name);
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len = strlen(name);
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if ((dirp = opendir(name)) == NULL)
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err(3, "%s", name);
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while ((dp = readdir(dirp)) != NULL) {
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strlcpy(&name[len], dp->d_name, sizeof name - len);
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if (stat(name, &devstat) == -1)
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err(4, "%s", name);
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if (stbuf.st_dev == devstat.st_rdev &&
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S_ISBLK(devstat.st_mode))
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break;
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}
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/*
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* We've found the block device, but since the filesystem
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* is mounted, we must write to the raw (character) device
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* instead. This is not guaranteed to work if someone has a
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* /dev that doesn't follow standard naming conventions, but
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* it's all we've got.
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*/
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name[len] = 'r';
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strlcpy(&name[len+1], dp->d_name, sizeof name - (len+1));
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closedir(dirp);
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if (dp == NULL)
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err(5, "Cannot find dev 0%o corresponding to %s",
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stbuf.st_rdev, argv[1]);
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if ((fsi = open(name, O_RDONLY)) == -1)
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err(6, "%s", name);
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fs = &sblock;
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rdfs(SBOFF, SBSIZE, (char *)fs);
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for (argc -= 2, argv += 2; argc > 0; argc--, argv++) {
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number = strtonum(*argv, 0, QUAD_MAX, NULL);
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if (chkuse(number, 1))
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continue;
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if (mknod(*argv, S_IFMT|S_IRUSR|S_IWUSR,
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dbtofsb(fs, number)) < 0) {
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warn("%s", *argv);
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errs++;
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}
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}
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printf("Don't forget to run ``fsck %s''\n", name);
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exit(errs);
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}
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static int
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chkuse(daddr_t blkno, int cnt)
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{
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int cg;
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daddr_t fsbn, bn;
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fsbn = dbtofsb(fs, blkno);
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if (fsbn+cnt > fs->fs_ffs1_size) {
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fprintf(stderr, "block %lld out of range of file system\n",
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(long long)blkno);
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return (1);
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}
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cg = dtog(fs, fsbn);
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if (fsbn < cgdmin(fs, cg)) {
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if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
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fprintf(stderr, "block %lld in non-data area: cannot "
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"attach\n", (long long)blkno);
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return (1);
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}
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} else {
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if ((fsbn+cnt) > cgbase(fs, cg+1)) {
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fprintf(stderr, "block %lld in non-data area: cannot "
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"attach\n", (long long)blkno);
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return (1);
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}
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}
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rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
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(char *)&acg);
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if (!cg_chkmagic(&acg)) {
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fprintf(stderr, "cg %d: bad magic number\n", cg);
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errs++;
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return (1);
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}
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bn = dtogd(fs, fsbn);
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if (isclr(cg_blksfree(&acg), bn))
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fprintf(stderr, "Warning: sector %lld is in use\n",
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(long long)blkno);
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return (0);
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}
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/*
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* read a block from the file system
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*/
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static void
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rdfs(daddr_t bno, int size, char *bf)
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{
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if (pread(fsi, bf, size, bno * DEV_BSIZE) != size) {
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fprintf(stderr, "read error: %lld\n", (long long)bno);
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err(1, "rdfs");
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}
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}
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