1 /* $OpenBSD: clri.c,v 1.22 2020/06/24 05:46:07 otto Exp $ */ 2 /* $NetBSD: clri.c,v 1.19 2005/01/20 15:50:47 xtraeme Exp $ */ 3 4 /* 5 * Copyright (c) 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rich $alz of BBN Inc. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/param.h> /* MAXBSIZE DEV_BSIZE */ 37 38 #include <ufs/ufs/dinode.h> 39 #include <ufs/ffs/fs.h> 40 41 #include <err.h> 42 #include <fcntl.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <stdio.h> 46 #include <unistd.h> 47 #include <util.h> 48 49 /* 50 * Possible superblock locations ordered from most to least likely. 51 */ 52 static int sblock_try[] = SBLOCKSEARCH; 53 54 static void 55 usage(void) 56 { 57 (void)fprintf(stderr, "usage: clri special_device inode_number ...\n"); 58 exit(1); 59 } 60 61 int 62 main(int argc, char *argv[]) 63 { 64 struct ufs1_dinode *dp1; 65 struct ufs2_dinode *dp2; 66 struct fs *sbp; 67 char *ibuf[MAXBSIZE]; 68 char *fs, sblock[SBLOCKSIZE]; 69 size_t bsize; 70 off_t offset; 71 int i, fd; 72 ino_t imax, inonum; 73 74 if (argc < 3) 75 usage(); 76 77 fs = *++argv; 78 sbp = NULL; 79 80 /* get the superblock. */ 81 if ((fd = opendev(fs, O_RDWR, 0, NULL)) == -1) 82 err(1, "%s", fs); 83 84 if (pledge("stdio", NULL) == -1) 85 err(1, "pledge"); 86 87 for (i = 0; sblock_try[i] != -1; i++) { 88 offset = (off_t)(sblock_try[i]); 89 if (pread(fd, sblock, sizeof(sblock), offset) != sizeof(sblock)) 90 err(1, "%s: can't read superblock", fs); 91 sbp = (struct fs *)sblock; 92 if ((sbp->fs_magic == FS_UFS1_MAGIC || 93 (sbp->fs_magic == FS_UFS2_MAGIC && 94 sbp->fs_sblockloc == sblock_try[i])) && 95 sbp->fs_bsize <= MAXBSIZE && 96 sbp->fs_bsize >= (int)sizeof(struct fs)) 97 break; 98 } 99 if (sblock_try[i] == -1) 100 errx(2, "cannot find file system superblock"); 101 bsize = sbp->fs_bsize; 102 103 /* check that inode numbers are valid */ 104 imax = sbp->fs_ncg * sbp->fs_ipg; 105 for (i = 1; i < (argc - 1); i++) { 106 const char *errstr; 107 strtonum(argv[i], 1, imax, &errstr); 108 if (errstr) 109 errx(1, "%s is not a valid inode number: %s", argv[i], errstr); 110 } 111 112 /* clear the clean flag in the superblock */ 113 if (sbp->fs_inodefmt >= FS_44INODEFMT) { 114 sbp->fs_clean = 0; 115 if (pwrite(fd, sblock, sizeof(sblock), offset) != sizeof(sblock)) 116 err(1, "%s: can't update superblock", fs); 117 (void)fsync(fd); 118 } 119 120 /* remaining arguments are inode numbers. */ 121 while (*++argv) { 122 /* get the inode number. */ 123 inonum = strtonum(*argv, 1, imax, NULL); 124 (void)printf("clearing %llu\n", inonum); 125 126 /* read in the appropriate block. */ 127 offset = ino_to_fsba(sbp, inonum); /* inode to fs blk */ 128 offset = fsbtodb(sbp, offset); /* fs blk disk blk */ 129 offset *= DEV_BSIZE; /* disk blk to bytes */ 130 131 /* seek and read the block */ 132 if (pread(fd, ibuf, bsize, offset) != bsize) 133 err(1, "%s", fs); 134 135 if (sbp->fs_magic == FS_UFS2_MAGIC) { 136 /* get the inode within the block. */ 137 dp2 = &(((struct ufs2_dinode *)ibuf) 138 [ino_to_fsbo(sbp, inonum)]); 139 140 /* clear the inode, and bump the generation count. */ 141 memset(dp2, 0, sizeof(*dp2)); 142 dp2->di_gen = arc4random(); 143 } else { 144 /* get the inode within the block. */ 145 dp1 = &(((struct ufs1_dinode *)ibuf) 146 [ino_to_fsbo(sbp, inonum)]); 147 148 /* clear the inode, and bump the generation count. */ 149 memset(dp1, 0, sizeof(*dp1)); 150 dp1->di_gen = arc4random(); 151 } 152 153 /* backup and write the block */ 154 if (pwrite(fd, ibuf, bsize, offset) != bsize) 155 err(1, "%s", fs); 156 (void)fsync(fd); 157 } 158 (void)close(fd); 159 exit(0); 160 } 161