1 /* $OpenBSD: clri.c,v 1.19 2016/03/07 21:47:04 natano 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, imax, inonum; 72 73 if (argc < 3) 74 usage(); 75 76 fs = *++argv; 77 sbp = NULL; 78 79 /* get the superblock. */ 80 if ((fd = opendev(fs, O_RDWR, 0, NULL)) < 0) 81 err(1, "%s", fs); 82 83 if (pledge("stdio", NULL) == -1) 84 err(1, "pledge"); 85 86 for (i = 0; sblock_try[i] != -1; i++) { 87 offset = (off_t)(sblock_try[i]); 88 if (pread(fd, sblock, sizeof(sblock), offset) != sizeof(sblock)) 89 err(1, "%s: can't read superblock", fs); 90 sbp = (struct fs *)sblock; 91 if ((sbp->fs_magic == FS_UFS1_MAGIC || 92 (sbp->fs_magic == FS_UFS2_MAGIC && 93 sbp->fs_sblockloc == sblock_try[i])) && 94 sbp->fs_bsize <= MAXBSIZE && 95 sbp->fs_bsize >= (int)sizeof(struct fs)) 96 break; 97 } 98 if (sblock_try[i] == -1) 99 errx(2, "cannot find file system superblock"); 100 bsize = sbp->fs_bsize; 101 102 /* check that inode numbers are valid */ 103 imax = sbp->fs_ncg * sbp->fs_ipg; 104 for (i = 1; i < (argc - 1); i++) { 105 const char *errstr; 106 strtonum(argv[i], 1, imax, &errstr); 107 if (errstr) 108 errx(1, "%s is not a valid inode number: %s", argv[i], errstr); 109 } 110 111 /* clear the clean flag in the superblock */ 112 if (sbp->fs_inodefmt >= FS_44INODEFMT) { 113 sbp->fs_clean = 0; 114 if (pwrite(fd, sblock, sizeof(sblock), offset) != sizeof(sblock)) 115 err(1, "%s: can't update superblock", fs); 116 (void)fsync(fd); 117 } 118 119 /* remaining arguments are inode numbers. */ 120 while (*++argv) { 121 /* get the inode number. */ 122 inonum = strtonum(*argv, 1, imax, NULL); 123 (void)printf("clearing %u\n", inonum); 124 125 /* read in the appropriate block. */ 126 offset = ino_to_fsba(sbp, inonum); /* inode to fs blk */ 127 offset = fsbtodb(sbp, offset); /* fs blk disk blk */ 128 offset *= DEV_BSIZE; /* disk blk to bytes */ 129 130 /* seek and read the block */ 131 if (pread(fd, ibuf, bsize, offset) != bsize) 132 err(1, "%s", fs); 133 134 if (sbp->fs_magic == FS_UFS2_MAGIC) { 135 /* get the inode within the block. */ 136 dp2 = &(((struct ufs2_dinode *)ibuf) 137 [ino_to_fsbo(sbp, inonum)]); 138 139 /* clear the inode, and bump the generation count. */ 140 memset(dp2, 0, sizeof(*dp2)); 141 dp2->di_gen = arc4random(); 142 } else { 143 /* get the inode within the block. */ 144 dp1 = &(((struct ufs1_dinode *)ibuf) 145 [ino_to_fsbo(sbp, inonum)]); 146 147 /* clear the inode, and bump the generation count. */ 148 memset(dp1, 0, sizeof(*dp1)); 149 dp1->di_gen = arc4random(); 150 } 151 152 /* backup and write the block */ 153 if (pwrite(fd, ibuf, bsize, offset) != bsize) 154 err(1, "%s", fs); 155 (void)fsync(fd); 156 } 157 (void)close(fd); 158 exit(0); 159 } 160