1 /* $NetBSD: fsirand.c,v 1.10 1998/10/23 01:27:51 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Christos Zoulas. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Christos Zoulas. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __RCSID("$NetBSD: fsirand.c,v 1.10 1998/10/23 01:27:51 thorpej Exp $"); 35 #endif /* lint */ 36 37 #include <stdio.h> 38 #include <string.h> 39 #include <ctype.h> 40 #include <fcntl.h> 41 #include <errno.h> 42 #include <err.h> 43 #include <stdlib.h> 44 #include <unistd.h> 45 46 #include <sys/types.h> 47 #include <sys/param.h> 48 #include <sys/time.h> 49 #include <sys/vnode.h> 50 #include <sys/disklabel.h> 51 #include <sys/ioctl.h> 52 53 #include <ufs/ufs/quota.h> 54 #include <ufs/ufs/inode.h> 55 #include <ufs/ufs/ufs_bswap.h> 56 57 #include <ufs/ffs/fs.h> 58 #include <ufs/ffs/ffs_extern.h> 59 60 static void usage __P((void)); 61 static void getsblock __P((int, const char *, struct disklabel *, struct fs *)); 62 static void fixinodes __P((int, struct fs *, struct disklabel *, int, long)); 63 64 int main __P((int, char *[])); 65 66 int needswap = 0; 67 68 static void 69 usage() 70 { 71 extern char *__progname; 72 73 (void) fprintf(stderr, "%s: [-x <constant>] [-p] <special>\n", 74 __progname); 75 exit(1); 76 } 77 78 79 /* getsblock(): 80 * Return the superblock 81 */ 82 static void 83 getsblock(fd, name, lab, fs) 84 int fd; 85 const char *name; 86 struct disklabel *lab; 87 struct fs *fs; 88 { 89 struct partition *pp = NULL; 90 char p = name[strlen(name) - 1]; 91 92 if (p >= 'a' && p <= 'h') 93 pp = &lab->d_partitions[p - 'a']; 94 else if (isdigit((unsigned char) p)) 95 pp = &lab->d_partitions[0]; 96 else 97 errx(1, "Invalid partition `%c'", p); 98 99 if (pp->p_fstype != FS_BSDFFS) 100 errx(1, "Not an FFS partition"); 101 102 if (lseek(fd, (off_t) SBOFF , SEEK_SET) == (off_t) -1) 103 err(1, "Cannot seek to superblock"); 104 105 if (read(fd, fs, SBSIZE) != SBSIZE) 106 err(1, "Cannot read superblock"); 107 108 if (fs->fs_magic != FS_MAGIC) { 109 if(fs->fs_magic == bswap32(FS_MAGIC)) { 110 needswap = 1; 111 ffs_sb_swap(fs, fs, 0); 112 } else 113 errx(1, "Bad superblock magic number"); 114 } 115 116 if (fs->fs_ncg < 1) 117 errx(1, "Bad ncg in superblock"); 118 119 if (fs->fs_cpg < 1) 120 errx(1, "Bad cpg in superblock"); 121 122 if (fs->fs_ncg * fs->fs_cpg < fs->fs_ncyl || 123 (fs->fs_ncg - 1) * fs->fs_cpg >= fs->fs_ncyl) 124 errx(1, "Bad number of cylinders in superblock"); 125 126 if (fs->fs_sbsize > SBSIZE) 127 errx(1, "Superblock too large"); 128 } 129 130 /* fixinodes(): 131 * Randomize the inode generation numbers 132 */ 133 static void 134 fixinodes(fd, fs, lab, pflag, xorval) 135 int fd; 136 struct fs *fs; 137 struct disklabel *lab; 138 int pflag; 139 long xorval; 140 { 141 int inopb = INOPB(fs); 142 int size = inopb * DINODE_SIZE; 143 caddr_t buf; 144 struct dinode *dip; 145 int i, ino, imax; 146 147 if ((buf = malloc(size)) == NULL) 148 err(1, "Out of memory"); 149 150 for (ino = 0, imax = fs->fs_ipg * fs->fs_ncg; ino < imax;) { 151 off_t sp; 152 #if __GNUC__ /* XXX work around lame compiler problem (gcc 2.7.2) */ 153 (void)&sp; 154 #endif 155 sp = (off_t) fsbtodb(fs, ino_to_fsba(fs, ino)) * 156 (off_t) lab->d_secsize; 157 158 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 159 err(1, "Seeking to inode %d failed", ino); 160 161 if (read(fd, buf, size) != size) 162 err(1, "Reading inodes %d+%d failed", ino, inopb); 163 164 for (i = 0; i < inopb; i++) { 165 dip = (struct dinode *)(buf + (i * DINODE_SIZE)); 166 if (pflag) 167 printf("ino %d gen 0x%x\n", ino, 168 ufs_rw32(dip->di_gen, needswap)); 169 else 170 dip->di_gen = ufs_rw32(random() ^ xorval, needswap); 171 if (++ino > imax) 172 errx(1, "Exceeded number of inodes"); 173 } 174 175 if (pflag) 176 continue; 177 178 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 179 err(1, "Seeking to inode %d failed", ino); 180 181 if (write(fd, buf, size) != size) 182 err(1, "Writing inodes %d+%d failed", ino, inopb); 183 } 184 free(buf); 185 } 186 187 int 188 main(argc, argv) 189 int argc; 190 char *argv[]; 191 { 192 char buf[SBSIZE]; 193 struct fs *fs = (struct fs *) buf; 194 struct disklabel lab; 195 int fd, c; 196 long xorval = 0; 197 char *ep; 198 struct timeval tv; 199 200 int pflag = 0; 201 202 while ((c = getopt(argc, argv, "px:")) != -1) 203 switch (c) { 204 case 'p': 205 pflag++; 206 break; 207 case 'x': 208 xorval = strtol(optarg, &ep, 0); 209 if ((xorval == LONG_MIN || xorval == LONG_MAX) && 210 errno == ERANGE) 211 err(1, "Out of range constant"); 212 if (*ep) 213 errx(1, "Bad constant"); 214 break; 215 default: 216 usage(); 217 } 218 219 argv += optind; 220 argc -= optind; 221 222 if (argc != 1) 223 usage(); 224 225 (void) gettimeofday(&tv, NULL); 226 srandom((unsigned) tv.tv_usec); 227 228 if ((fd = open(argv[0], pflag ? O_RDONLY : O_RDWR)) == -1) 229 err(1, "Cannot open `%s'", argv[0]); 230 231 if (ioctl(fd, DIOCGDINFO, &lab) == -1) 232 err(1, "Cannot get label information"); 233 234 getsblock(fd, argv[0], &lab, fs); 235 fixinodes(fd, fs, &lab, pflag, xorval); 236 237 (void) close(fd); 238 return 0; 239 } 240