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 5.6 (Berkeley) 02/15/93"; 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, bsize; 41 off_t offset; 42 int inonum; 43 char sblock[SBSIZE]; 44 45 if (argc < 3) { 46 (void)fprintf(stderr, "usage: clri filesystem inode ...\n"); 47 exit(1); 48 } 49 50 fs = *++argv; 51 52 /* get the superblock. */ 53 if ((fd = open(fs, O_RDWR, 0)) < 0) 54 error(); 55 if (lseek(fd, (off_t)(SBLOCK * DEV_BSIZE), SEEK_SET) < 0) 56 error(); 57 if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock)) { 58 (void)fprintf(stderr, 59 "clri: %s: can't read the superblock.\n", fs); 60 exit(1); 61 } 62 63 sbp = (struct fs *)sblock; 64 if (sbp->fs_magic != FS_MAGIC) { 65 (void)fprintf(stderr, 66 "clri: %s: superblock magic number 0x%x, not 0x%x.\n", 67 fs, sbp->fs_magic, FS_MAGIC); 68 exit(1); 69 } 70 bsize = sbp->fs_bsize; 71 72 /* remaining arguments are inode numbers. */ 73 while (*++argv) { 74 /* get the inode number. */ 75 if ((inonum = atoi(*argv)) <= 0) { 76 (void)fprintf(stderr, 77 "clri: %s is not a valid inode number.\n", *argv); 78 exit(1); 79 } 80 (void)printf("clearing %d\n", inonum); 81 82 /* read in the appropriate block. */ 83 offset = itod(sbp, inonum); /* inode to fs block */ 84 offset = fsbtodb(sbp, offset); /* fs block to disk block */ 85 offset *= DEV_BSIZE; /* disk block to disk bytes */ 86 87 /* seek and read the block */ 88 if (lseek(fd, offset, SEEK_SET) < 0) 89 error(); 90 if (read(fd, (char *)ibuf, bsize) != bsize) 91 error(); 92 93 /* get the inode within the block. */ 94 ip = &ibuf[itoo(sbp, inonum)]; 95 96 /* clear the inode, and bump the generation count. */ 97 generation = ip->di_gen + 1; 98 bzero((char *)ip, sizeof *ip); 99 ip->di_gen = generation; 100 101 /* backup and write the block */ 102 if (lseek(fd, (off_t)-bsize, SEEK_CUR) < 0) 103 error(); 104 if (write(fd, (char *)ibuf, bsize) != bsize) 105 error(); 106 (void)fsync(fd); 107 } 108 (void)close(fd); 109 exit(0); 110 } 111 112 error() 113 { 114 (void)fprintf(stderr, "clri: %s: %s\n", fs, strerror(errno)); 115 exit(1); 116 } 117