fsirand.c revision 1.11
1 /* $NetBSD: fsirand.c,v 1.11 2001/02/04 20:04:02 christos 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 1.11 2001/02/04 20:04:02 christos 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 extern char *__progname; 76 77 static void 78 usage() 79 { 80 (void) fprintf(stderr, "Usage: %s [-x <constant>] [-p] <special>\n", 81 __progname); 82 exit(1); 83 } 84 85 86 /* getsblock(): 87 * Return the superblock 88 */ 89 static void 90 getsblock(fd, name, lab, fs) 91 int fd; 92 const char *name; 93 struct disklabel *lab; 94 struct fs *fs; 95 { 96 struct partition *pp = NULL; 97 char p = name[strlen(name) - 1]; 98 99 if (p >= 'a' && p <= 'h') 100 pp = &lab->d_partitions[p - 'a']; 101 else if (isdigit((unsigned char) p)) 102 pp = &lab->d_partitions[0]; 103 else 104 errx(1, "Invalid partition `%c'", p); 105 106 if (pp->p_fstype != FS_BSDFFS) 107 errx(1, "Not an FFS partition"); 108 109 if (lseek(fd, (off_t) SBOFF , SEEK_SET) == (off_t) -1) 110 err(1, "Cannot seek to superblock"); 111 112 if (read(fd, fs, SBSIZE) != SBSIZE) 113 err(1, "Cannot read superblock"); 114 115 if (fs->fs_magic != FS_MAGIC) { 116 if(fs->fs_magic == bswap32(FS_MAGIC)) { 117 needswap = 1; 118 ffs_sb_swap(fs, fs, 0); 119 } else 120 errx(1, "Bad superblock magic number"); 121 } 122 123 if (fs->fs_ncg < 1) 124 errx(1, "Bad ncg in superblock"); 125 126 if (fs->fs_cpg < 1) 127 errx(1, "Bad cpg in superblock"); 128 129 if (fs->fs_ncg * fs->fs_cpg < fs->fs_ncyl || 130 (fs->fs_ncg - 1) * fs->fs_cpg >= fs->fs_ncyl) 131 errx(1, "Bad number of cylinders in superblock"); 132 133 if (fs->fs_sbsize > SBSIZE) 134 errx(1, "Superblock too large"); 135 } 136 137 /* fixinodes(): 138 * Randomize the inode generation numbers 139 */ 140 static void 141 fixinodes(fd, fs, lab, pflag, xorval) 142 int fd; 143 struct fs *fs; 144 struct disklabel *lab; 145 int pflag; 146 long xorval; 147 { 148 int inopb = INOPB(fs); 149 int size = inopb * DINODE_SIZE; 150 caddr_t buf; 151 struct dinode *dip; 152 int i, ino, imax; 153 154 if ((buf = malloc(size)) == NULL) 155 err(1, "Out of memory"); 156 157 for (ino = 0, imax = fs->fs_ipg * fs->fs_ncg; ino < imax;) { 158 off_t sp; 159 #if __GNUC__ /* XXX work around lame compiler problem (gcc 2.7.2) */ 160 (void)&sp; 161 #endif 162 sp = (off_t) fsbtodb(fs, ino_to_fsba(fs, ino)) * 163 (off_t) lab->d_secsize; 164 165 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 166 err(1, "Seeking to inode %d failed", ino); 167 168 if (read(fd, buf, size) != size) 169 err(1, "Reading inodes %d+%d failed", ino, inopb); 170 171 for (i = 0; i < inopb; i++) { 172 dip = (struct dinode *)(buf + (i * DINODE_SIZE)); 173 if (pflag) 174 printf("ino %d gen 0x%x\n", ino, 175 ufs_rw32(dip->di_gen, needswap)); 176 else 177 dip->di_gen = ufs_rw32(random() ^ xorval, needswap); 178 if (++ino > imax) 179 errx(1, "Exceeded number of inodes"); 180 } 181 182 if (pflag) 183 continue; 184 185 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 186 err(1, "Seeking to inode %d failed", ino); 187 188 if (write(fd, buf, size) != size) 189 err(1, "Writing inodes %d+%d failed", ino, inopb); 190 } 191 free(buf); 192 } 193 194 int 195 main(argc, argv) 196 int argc; 197 char *argv[]; 198 { 199 char buf[SBSIZE]; 200 struct fs *fs = (struct fs *) buf; 201 struct disklabel lab; 202 int fd, c; 203 long xorval = 0; 204 char *ep; 205 struct timeval tv; 206 207 int pflag = 0; 208 209 while ((c = getopt(argc, argv, "px:")) != -1) 210 switch (c) { 211 case 'p': 212 pflag++; 213 break; 214 case 'x': 215 xorval = strtol(optarg, &ep, 0); 216 if ((xorval == LONG_MIN || xorval == LONG_MAX) && 217 errno == ERANGE) 218 err(1, "Out of range constant"); 219 if (*ep) 220 errx(1, "Bad constant"); 221 break; 222 default: 223 usage(); 224 } 225 226 argv += optind; 227 argc -= optind; 228 229 if (argc != 1) 230 usage(); 231 232 (void) gettimeofday(&tv, NULL); 233 srandom((unsigned) tv.tv_usec); 234 235 if ((fd = open(argv[0], pflag ? O_RDONLY : O_RDWR)) == -1) 236 err(1, "Cannot open `%s'", argv[0]); 237 238 if (ioctl(fd, DIOCGDINFO, &lab) == -1) 239 err(1, "Cannot get label information"); 240 241 getsblock(fd, argv[0], &lab, fs); 242 fixinodes(fd, fs, &lab, pflag, xorval); 243 244 (void) close(fd); 245 return 0; 246 } 247
Indexes created Sun Sep 28 16:09:52 GMT 2025