1 /* 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rich $alz of BBN Inc. 7 * 8 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 static char copyright[] = 13 "@(#) Copyright (c) 1990, 1993\n\ 14 The Regents of the University of California. All rights reserved.\n"; 15 #endif /* not lint */ 16 17 #ifndef lint 18 static char sccsid[] = "@(#)clri.c 8.1 (Berkeley) 06/05/93"; 19 #endif /* not lint */ 20 21 #include <sys/param.h> 22 #include <sys/time.h> 23 24 #include <ufs/ufs/dinode.h> 25 #include <ufs/ffs/fs.h> 26 27 #include <err.h> 28 #include <errno.h> 29 #include <fcntl.h> 30 #include <stdlib.h> 31 #include <string.h> 32 #include <stdio.h> 33 #include <unistd.h> 34 35 int 36 main(argc, argv) 37 int argc; 38 char *argv[]; 39 { 40 register struct fs *sbp; 41 register struct dinode *ip; 42 register int fd; 43 struct dinode ibuf[MAXBSIZE / sizeof (struct dinode)]; 44 long generation, bsize; 45 off_t offset; 46 int inonum; 47 char *fs, sblock[SBSIZE]; 48 49 if (argc < 3) { 50 (void)fprintf(stderr, "usage: clri filesystem inode ...\n"); 51 exit(1); 52 } 53 54 fs = *++argv; 55 56 /* get the superblock. */ 57 if ((fd = open(fs, O_RDWR, 0)) < 0) 58 err(1, "%s", fs); 59 if (lseek(fd, (off_t)(SBLOCK * DEV_BSIZE), SEEK_SET) < 0) 60 err(1, "%s", fs); 61 if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock)) { 62 (void)fprintf(stderr, 63 "clri: %s: can't read the superblock.\n", fs); 64 exit(1); 65 } 66 67 sbp = (struct fs *)sblock; 68 if (sbp->fs_magic != FS_MAGIC) { 69 (void)fprintf(stderr, 70 "clri: %s: superblock magic number 0x%x, not 0x%x.\n", 71 fs, sbp->fs_magic, FS_MAGIC); 72 exit(1); 73 } 74 bsize = sbp->fs_bsize; 75 76 /* remaining arguments are inode numbers. */ 77 while (*++argv) { 78 /* get the inode number. */ 79 if ((inonum = atoi(*argv)) <= 0) { 80 (void)fprintf(stderr, 81 "clri: %s is not a valid inode number.\n", *argv); 82 exit(1); 83 } 84 (void)printf("clearing %d\n", inonum); 85 86 /* read in the appropriate block. */ 87 offset = itod(sbp, inonum); /* inode to fs block */ 88 offset = fsbtodb(sbp, offset); /* fs block to disk block */ 89 offset *= DEV_BSIZE; /* disk block to disk bytes */ 90 91 /* seek and read the block */ 92 if (lseek(fd, offset, SEEK_SET) < 0) 93 err(1, "%s", fs); 94 if (read(fd, ibuf, bsize) != bsize) 95 err(1, "%s", fs); 96 97 /* get the inode within the block. */ 98 ip = &ibuf[itoo(sbp, inonum)]; 99 100 /* clear the inode, and bump the generation count. */ 101 generation = ip->di_gen + 1; 102 memset(ip, 0, sizeof(*ip)); 103 ip->di_gen = generation; 104 105 /* backup and write the block */ 106 if (lseek(fd, (off_t)-bsize, SEEK_CUR) < 0) 107 err(1, "%s", fs); 108 if (write(fd, ibuf, bsize) != bsize) 109 err(1, "%s", fs); 110 (void)fsync(fd); 111 } 112 (void)close(fd); 113 exit(0); 114 } 115