InfoMagic Source Code 1993 July/THE_SOURCE_CODE_CD_ROM.iso/bsd_srcs/sbin/badsect/badsect.c

C/C++ Source or Header | 1991-04-16 | 5.2 KB | 200 lines

/*
 * Copyright (c) 1981, 1983 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1981, 1983 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)badsect.c    5.9 (Berkeley) 6/1/90";
#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/fs.h>
#include <ufs/dinode.h>
#include <stdio.h>
#include <paths.h>

union {
    struct    fs fs;
    char    fsx[SBSIZE];
} ufs;
#define sblock    ufs.fs
union {
    struct    cg cg;
    char    cgx[MAXBSIZE];
} ucg;
#define    acg    ucg.cg
struct    fs *fs;
int    fso, fsi;
int    errs;
long    dev_bsize = 1;

char buf[MAXBSIZE];


main(argc, argv)
    int argc;
    char *argv[];
{
    daddr_t number;
    struct stat stbuf, devstat;
    register struct direct *dp;
    DIR *dirp;
    int fd;
    char name[BUFSIZ];

    if (argc < 3) {
        fprintf(stderr, "usage: badsect bbdir blkno [ blkno ]\n");
        exit(1);
    }
    if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0) {
        perror(argv[1]);
        exit(2);
    }
    strcpy(name, _PATH_DEV);
    if ((dirp = opendir(name)) == NULL) {
        perror(name);
        exit(3);
    }
    while ((dp = readdir(dirp)) != NULL) {
        strcpy(&name[5], dp->d_name);
        if (stat(name, &devstat) < 0) {
            perror(name);
            exit(4);
        }
        if (stbuf.st_dev == devstat.st_rdev &&
            (devstat.st_mode & IFMT) == IFBLK)
            break;
    }
    closedir(dirp);
    if (dp == NULL) {
        printf("Cannot find dev 0%o corresponding to %s\n",
            stbuf.st_rdev, argv[1]);
        exit(5);
    }
    if ((fsi = open(name, 0)) < 0) {
        perror(name);
        exit(6);
    }
    fs = &sblock;
    rdfs(SBOFF, SBSIZE, (char *)fs);
    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, IFMT|0600, dbtofsb(fs, number)) < 0) {
            perror(*argv);
            errs++;
        }
    }
    printf("Don't forget to run ``fsck %s''\n", name);
    exit(errs);
}

chkuse(blkno, cnt)
    daddr_t blkno;
    int cnt;
{
    int cg;
    daddr_t fsbn, bn;

    fsbn = dbtofsb(fs, blkno);
    if ((unsigned)(fsbn+cnt) > fs->fs_size) {
        printf("block %d out of range of file system\n", blkno);
        return (1);
    }
    cg = dtog(fs, fsbn);
    if (fsbn < cgdmin(fs, cg)) {
        if (cg == 0 || (fsbn+cnt) > cgsblock(fs, cg)) {
            printf("block %d in non-data area: cannot attach\n",
                blkno);
            return (1);
        }
    } else {
        if ((fsbn+cnt) > cgbase(fs, cg+1)) {
            printf("block %d in non-data area: cannot attach\n",
                blkno);
            return (1);
        }
    }
    rdfs(fsbtodb(fs, cgtod(fs, cg)), (int)sblock.fs_cgsize,
        (char *)&acg);
    if (!cg_chkmagic(&acg)) {
        fprintf(stderr, "cg %d: bad magic number\n", cg);
        errs++;
        return (1);
    }
    bn = dtogd(fs, fsbn);
    if (isclr(cg_blksfree(&acg), bn))
        printf("Warning: sector %d is in use\n", blkno);
    return (0);
}

/*
 * read a block from the file system
 */
rdfs(bno, size, bf)
    int bno, size;
    char *bf;
{
    int n;

    if (lseek(fsi, bno * dev_bsize, 0) < 0) {
        printf("seek error: %ld\n", bno);
        perror("rdfs");
        exit(1);
    }
    n = read(fsi, bf, size);
    if(n != size) {
        printf("read error: %ld\n", bno);
        perror("rdfs");
        exit(1);
    }
}