fsirand.c revision 1.12
1 /* $NetBSD: fsirand.c,v 1.12 2001/02/19 22:56:20 cgd Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __RCSID("$NetBSD: fsirand.c,v 1.12 2001/02/19 22:56:20 cgd Exp $"); 42 #endif /* lint */ 43 44 #include <stdio.h> 45 #include <string.h> 46 #include <ctype.h> 47 #include <fcntl.h> 48 #include <errno.h> 49 #include <err.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 53 #include <sys/types.h> 54 #include <sys/param.h> 55 #include <sys/time.h> 56 #include <sys/vnode.h> 57 #include <sys/disklabel.h> 58 #include <sys/ioctl.h> 59 60 #include <ufs/ufs/quota.h> 61 #include <ufs/ufs/inode.h> 62 #include <ufs/ufs/ufs_bswap.h> 63 64 #include <ufs/ffs/fs.h> 65 #include <ufs/ffs/ffs_extern.h> 66 67 static void usage __P((void)); 68 static void getsblock __P((int, const char *, struct disklabel *, struct fs *)); 69 static void fixinodes __P((int, struct fs *, struct disklabel *, int, long)); 70 71 int main __P((int, char *[])); 72 73 int needswap = 0; 74 75 static void 76 usage() 77 { 78 79 (void) fprintf(stderr, "Usage: %s [-x <constant>] [-p] <special>\n", 80 getprogname()); 81 exit(1); 82 } 83 84 85 /* getsblock(): 86 * Return the superblock 87 */ 88 static void 89 getsblock(fd, name, lab, fs) 90 int fd; 91 const char *name; 92 struct disklabel *lab; 93 struct fs *fs; 94 { 95 struct partition *pp = NULL; 96 char p = name[strlen(name) - 1]; 97 98 if (p >= 'a' && p <= 'h') 99 pp = &lab->d_partitions[p - 'a']; 100 else if (isdigit((unsigned char) p)) 101 pp = &lab->d_partitions[0]; 102 else 103 errx(1, "Invalid partition `%c'", p); 104 105 if (pp->p_fstype != FS_BSDFFS) 106 errx(1, "Not an FFS partition"); 107 108 if (lseek(fd, (off_t) SBOFF , SEEK_SET) == (off_t) -1) 109 err(1, "Cannot seek to superblock"); 110 111 if (read(fd, fs, SBSIZE) != SBSIZE) 112 err(1, "Cannot read superblock"); 113 114 if (fs->fs_magic != FS_MAGIC) { 115 if(fs->fs_magic == bswap32(FS_MAGIC)) { 116 needswap = 1; 117 ffs_sb_swap(fs, fs, 0); 118 } else 119 errx(1, "Bad superblock magic number"); 120 } 121 122 if (fs->fs_ncg < 1) 123 errx(1, "Bad ncg in superblock"); 124 125 if (fs->fs_cpg < 1) 126 errx(1, "Bad cpg in superblock"); 127 128 if (fs->fs_ncg * fs->fs_cpg < fs->fs_ncyl || 129 (fs->fs_ncg - 1) * fs->fs_cpg >= fs->fs_ncyl) 130 errx(1, "Bad number of cylinders in superblock"); 131 132 if (fs->fs_sbsize > SBSIZE) 133 errx(1, "Superblock too large"); 134 } 135 136 /* fixinodes(): 137 * Randomize the inode generation numbers 138 */ 139 static void 140 fixinodes(fd, fs, lab, pflag, xorval) 141 int fd; 142 struct fs *fs; 143 struct disklabel *lab; 144 int pflag; 145 long xorval; 146 { 147 int inopb = INOPB(fs); 148 int size = inopb * DINODE_SIZE; 149 caddr_t buf; 150 struct dinode *dip; 151 int i, ino, imax; 152 153 if ((buf = malloc(size)) == NULL) 154 err(1, "Out of memory"); 155 156 for (ino = 0, imax = fs->fs_ipg * fs->fs_ncg; ino < imax;) { 157 off_t sp; 158 #if __GNUC__ /* XXX work around lame compiler problem (gcc 2.7.2) */ 159 (void)&sp; 160 #endif 161 sp = (off_t) fsbtodb(fs, ino_to_fsba(fs, ino)) * 162 (off_t) lab->d_secsize; 163 164 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 165 err(1, "Seeking to inode %d failed", ino); 166 167 if (read(fd, buf, size) != size) 168 err(1, "Reading inodes %d+%d failed", ino, inopb); 169 170 for (i = 0; i < inopb; i++) { 171 dip = (struct dinode *)(buf + (i * DINODE_SIZE)); 172 if (pflag) 173 printf("ino %d gen 0x%x\n", ino, 174 ufs_rw32(dip->di_gen, needswap)); 175 else 176 dip->di_gen = ufs_rw32(random() ^ xorval, needswap); 177 if (++ino > imax) 178 errx(1, "Exceeded number of inodes"); 179 } 180 181 if (pflag) 182 continue; 183 184 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 185 err(1, "Seeking to inode %d failed", ino); 186 187 if (write(fd, buf, size) != size) 188 err(1, "Writing inodes %d+%d failed", ino, inopb); 189 } 190 free(buf); 191 } 192 193 int 194 main(argc, argv) 195 int argc; 196 char *argv[]; 197 { 198 char buf[SBSIZE]; 199 struct fs *fs = (struct fs *) buf; 200 struct disklabel lab; 201 int fd, c; 202 long xorval = 0; 203 char *ep; 204 struct timeval tv; 205 206 int pflag = 0; 207 208 while ((c = getopt(argc, argv, "px:")) != -1) 209 switch (c) { 210 case 'p': 211 pflag++; 212 break; 213 case 'x': 214 xorval = strtol(optarg, &ep, 0); 215 if ((xorval == LONG_MIN || xorval == LONG_MAX) && 216 errno == ERANGE) 217 err(1, "Out of range constant"); 218 if (*ep) 219 errx(1, "Bad constant"); 220 break; 221 default: 222 usage(); 223 } 224 225 argv += optind; 226 argc -= optind; 227 228 if (argc != 1) 229 usage(); 230 231 (void) gettimeofday(&tv, NULL); 232 srandom((unsigned) tv.tv_usec); 233 234 if ((fd = open(argv[0], pflag ? O_RDONLY : O_RDWR)) == -1) 235 err(1, "Cannot open `%s'", argv[0]); 236 237 if (ioctl(fd, DIOCGDINFO, &lab) == -1) 238 err(1, "Cannot get label information"); 239 240 getsblock(fd, argv[0], &lab, fs); 241 fixinodes(fd, fs, &lab, pflag, xorval); 242 243 (void) close(fd); 244 return 0; 245 } 246
Indexes created Mon Sep 29 21:09:56 GMT 2025