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clri.c revision 1.4 
      1 /*
      2  * Copyright (c) 1990 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Rich $alz of BBN Inc.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 char copyright[] =
     39 "@(#) Copyright (c) 1990 The Regents of the University of California.\n\
     40  All rights reserved.\n";
     41 #endif /* not lint */
     42 
     43 #ifndef lint
     44 /*static char sccsid[] = "from: @(#)clri.c	5.3 (Berkeley) 6/29/91";*/
     45 static char rcsid[] = "$Id: clri.c,v 1.4 1993/08/01 18:28:09 mycroft Exp $";
     46 #endif /* not lint */
     47 
     48 /*
     49  * clri(8)
     50  */
     51 
     52 #include <sys/param.h>
     53 #include <ufs/quota.h>
     54 #include <ufs/inode.h>
     55 #include <ufs/fs.h>
     56 #include <unistd.h>
     57 #include <stdio.h>
     58 #include <fcntl.h>
     59 #include <errno.h>
     60 
     61 char *fs;
     62 
     63 main(argc, argv)
     64 	int argc;
     65 	char **argv;
     66 {
     67 	register struct fs *sbp;
     68 	register struct dinode *ip;
     69 	register int fd;
     70 	struct dinode ibuf[MAXBSIZE / sizeof (struct dinode)];
     71 	long generation, offset, bsize;
     72 	int inonum;
     73 	char sblock[SBSIZE];
     74 
     75 	if (argc < 3) {
     76 		(void)fprintf(stderr, "usage: clri filesystem inode ...\n");
     77 		exit(1);
     78 	}
     79 
     80 	fs = *++argv;
     81 
     82 	/* get the superblock. */
     83 	if ((fd = open(fs, O_RDWR, 0)) < 0)
     84 		error();
     85 	if (lseek(fd, SBLOCK * DEV_BSIZE, SEEK_SET) < 0)
     86 		error();
     87 	if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock)) {
     88 		(void)fprintf(stderr,
     89 		    "clri: %s: can't read the superblock.\n", fs);
     90 		exit(1);
     91 	}
     92 
     93 	sbp = (struct fs *)sblock;
     94 	if (sbp->fs_magic != FS_MAGIC) {
     95 		(void)fprintf(stderr,
     96 		    "clri: %s: superblock magic number 0x%x, not 0x%x.\n",
     97 		    fs, sbp->fs_magic, FS_MAGIC);
     98 		exit(1);
     99 	}
    100 	bsize = sbp->fs_bsize;
    101 
    102 	/* remaining arguments are inode numbers. */
    103 	while (*++argv) {
    104 		/* get the inode number. */
    105 		if ((inonum = atoi(*argv)) <= 0) {
    106 			(void)fprintf(stderr,
    107 			    "clri: %s is not a valid inode number.\n", *argv);
    108 			exit(1);
    109 		}
    110 		(void)printf("clearing %d\n", inonum);
    111 
    112 		/* read in the appropriate block. */
    113 		offset = itod(sbp, inonum);	/* inode to fs block */
    114 		offset = fsbtodb(sbp, offset);	/* fs block to disk block */
    115 		offset *= DEV_BSIZE;		/* disk block to disk bytes */
    116 
    117 		/* seek and read the block */
    118 		if (lseek(fd, offset, SEEK_SET) < 0)
    119 			error();
    120 		if (read(fd, (char *)ibuf, bsize) != bsize)
    121 			error();
    122 
    123 		/* get the inode within the block. */
    124 		ip = &ibuf[itoo(sbp, inonum)];
    125 
    126 		/* clear the inode, and bump the generation count. */
    127 		generation = ip->di_gen + 1;
    128 		bzero((char *)ip, sizeof *ip);
    129 		ip->di_gen = generation;
    130 
    131 		/* backup and write the block */
    132 		if (lseek(fd, -bsize, SEEK_CUR) < 0)
    133 			error();
    134 		if (write(fd, (char *)ibuf, bsize) != bsize)
    135 			error();
    136 		(void)fsync(fd);
    137 	}
    138 	(void)close(fd);
    139 	exit(0);
    140 }
    141 
    142 error()
    143 {
    144 	(void)fprintf(stderr, "clri: %s: %s\n", fs, strerror(errno));
    145 	exit(1);
    146 }
    147