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 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 char copyright[] = 13 "@(#) Copyright (c) 1990 The Regents of the University of California.\n\ 14 All rights reserved.\n"; 15 #endif /* not lint */ 16 17 #ifndef lint 18 static char sccsid[] = "@(#)clri.c 5.5 (Berkeley) 05/28/92"; 19 #endif /* not lint */ 20 21 #include <sys/param.h> 22 #include <sys/time.h> 23 #include <ufs/ufs/dinode.h> 24 #include <ufs/ffs/fs.h> 25 #include <unistd.h> 26 #include <stdio.h> 27 #include <fcntl.h> 28 #include <errno.h> 29 30 char *fs; 31 32 main(argc, argv) 33 int argc; 34 char **argv; 35 { 36 register struct fs *sbp; 37 register struct dinode *ip; 38 register int fd; 39 struct dinode ibuf[MAXBSIZE / sizeof (struct dinode)]; 40 long generation, offset, bsize; 41 int inonum; 42 char sblock[SBSIZE]; 43 44 if (argc < 3) { 45 (void)fprintf(stderr, "usage: clri filesystem inode ...\n"); 46 exit(1); 47 } 48 49 fs = *++argv; 50 51 /* get the superblock. */ 52 if ((fd = open(fs, O_RDWR, 0)) < 0) 53 error(); 54 if (lseek(fd, SBLOCK * DEV_BSIZE, SEEK_SET) < 0) 55 error(); 56 if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock)) { 57 (void)fprintf(stderr, 58 "clri: %s: can't read the superblock.\n", fs); 59 exit(1); 60 } 61 62 sbp = (struct fs *)sblock; 63 if (sbp->fs_magic != FS_MAGIC) { 64 (void)fprintf(stderr, 65 "clri: %s: superblock magic number 0x%x, not 0x%x.\n", 66 fs, sbp->fs_magic, FS_MAGIC); 67 exit(1); 68 } 69 bsize = sbp->fs_bsize; 70 71 /* remaining arguments are inode numbers. */ 72 while (*++argv) { 73 /* get the inode number. */ 74 if ((inonum = atoi(*argv)) <= 0) { 75 (void)fprintf(stderr, 76 "clri: %s is not a valid inode number.\n", *argv); 77 exit(1); 78 } 79 (void)printf("clearing %d\n", inonum); 80 81 /* read in the appropriate block. */ 82 offset = itod(sbp, inonum); /* inode to fs block */ 83 offset = fsbtodb(sbp, offset); /* fs block to disk block */ 84 offset *= DEV_BSIZE; /* disk block to disk bytes */ 85 86 /* seek and read the block */ 87 if (lseek(fd, offset, SEEK_SET) < 0) 88 error(); 89 if (read(fd, (char *)ibuf, bsize) != bsize) 90 error(); 91 92 /* get the inode within the block. */ 93 ip = &ibuf[itoo(sbp, inonum)]; 94 95 /* clear the inode, and bump the generation count. */ 96 generation = ip->di_gen + 1; 97 bzero((char *)ip, sizeof *ip); 98 ip->di_gen = generation; 99 100 /* backup and write the block */ 101 if (lseek(fd, -bsize, SEEK_CUR) < 0) 102 error(); 103 if (write(fd, (char *)ibuf, bsize) != bsize) 104 error(); 105 (void)fsync(fd); 106 } 107 (void)close(fd); 108 exit(0); 109 } 110 111 error() 112 { 113 (void)fprintf(stderr, "clri: %s: %s\n", fs, strerror(errno)); 114 exit(1); 115 } 116