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 5.2 (Berkeley) 06/11/90"; 19 #endif /* not lint */ 20 21 /* 22 * clri(8) 23 */ 24 25 #include <sys/param.h> 26 #include <sys/time.h> 27 #include <sys/vnode.h> 28 #include <ufs/quota.h> 29 #include <ufs/inode.h> 30 #include <ufs/fs.h> 31 #include <unistd.h> 32 #include <stdio.h> 33 #include <fcntl.h> 34 #include <errno.h> 35 36 char *fs; 37 38 main(argc, argv) 39 int argc; 40 char **argv; 41 { 42 register struct fs *sbp; 43 register struct dinode *ip; 44 register int fd; 45 struct dinode ibuf[MAXBSIZE / sizeof (struct dinode)]; 46 long generation, offset, bsize; 47 int inonum; 48 char sblock[SBSIZE]; 49 50 if (argc < 3) { 51 (void)fprintf(stderr, "usage: clri filesystem inode ...\n"); 52 exit(1); 53 } 54 55 fs = *++argv; 56 57 /* get the superblock. */ 58 if ((fd = open(fs, O_RDWR, 0)) < 0) 59 error(); 60 if (lseek(fd, SBLOCK * DEV_BSIZE, SEEK_SET) < 0) 61 error(); 62 if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock)) { 63 (void)fprintf(stderr, 64 "clri: %s: can't read the superblock.\n", fs); 65 exit(1); 66 } 67 68 sbp = (struct fs *)sblock; 69 if (sbp->fs_magic != FS_MAGIC) { 70 (void)fprintf(stderr, 71 "clri: %s: superblock magic number 0x%x, not 0x%x.\n", 72 fs, sbp->fs_magic, FS_MAGIC); 73 exit(1); 74 } 75 bsize = sbp->fs_bsize; 76 77 /* remaining arguments are inode numbers. */ 78 while (*++argv) { 79 /* get the inode number. */ 80 if ((inonum = atoi(*argv)) <= 0) { 81 (void)fprintf(stderr, 82 "clri: %s is not a valid inode number.\n", *argv); 83 exit(1); 84 } 85 (void)printf("clearing %d\n", inonum); 86 87 /* read in the appropriate block. */ 88 offset = itod(sbp, inonum); /* inode to fs block */ 89 offset = fsbtodb(sbp, offset); /* fs block to disk block */ 90 offset *= DEV_BSIZE; /* disk block to disk bytes */ 91 92 /* seek and read the block */ 93 if (lseek(fd, offset, SEEK_SET) < 0) 94 error(); 95 if (read(fd, (char *)ibuf, bsize) != bsize) 96 error(); 97 98 /* get the inode within the block. */ 99 ip = &ibuf[itoo(sbp, inonum)]; 100 101 /* clear the inode, and bump the generation count. */ 102 generation = ip->di_gen + 1; 103 bzero((char *)ip, sizeof *ip); 104 ip->di_gen = generation; 105 106 /* backup and write the block */ 107 if (lseek(fd, -bsize, SEEK_CUR) < 0) 108 error(); 109 if (write(fd, (char *)ibuf, bsize) != bsize) 110 error(); 111 (void)fsync(fd); 112 } 113 (void)close(fd); 114 exit(0); 115 } 116 117 error() 118 { 119 (void)fprintf(stderr, "clri: %s: %s\n", fs, strerror(errno)); 120 exit(1); 121 } 122