fsirand.c revision 1.18
1 /* $NetBSD: fsirand.c,v 1.18 2001/11/16 14:33:37 lukem 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 1.18 2001/11/16 14:33:37 lukem Exp $"); 42 #endif /* lint */ 43 44 #include <sys/param.h> 45 #include <sys/time.h> 46 #include <sys/vnode.h> 47 #include <sys/disklabel.h> 48 #include <sys/ioctl.h> 49 50 #include <ctype.h> 51 #include <err.h> 52 #include <errno.h> 53 #include <fcntl.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 #include <util.h> 59 60 #include <ufs/ufs/ufs_bswap.h> 61 62 #include <ufs/ffs/fs.h> 63 #include <ufs/ffs/ffs_extern.h> 64 65 static void usage(void); 66 static void getsblock(int, const char *, struct fs *); 67 static void fixinodes(int, struct fs *, struct disklabel *, int, long); 68 static void statussig(int); 69 70 int main(int, char *[]); 71 72 int needswap, ino, imax; 73 time_t tstart; 74 75 76 static void 77 usage(void) 78 { 79 80 (void) fprintf(stderr, 81 "Usage: %s [-F] [-p] [-x <constant>] <special>\n", 82 getprogname()); 83 exit(1); 84 } 85 86 87 /* 88 * getsblock(): 89 * Return the superblock 90 */ 91 static void 92 getsblock(int fd, const char *name, struct fs *fs) 93 { 94 95 if (lseek(fd, (off_t) SBOFF , SEEK_SET) == (off_t) -1) 96 err(1, "%s: cannot seek to superblock", name); 97 98 if (read(fd, fs, SBSIZE) != SBSIZE) 99 err(1, "%s: cannot read superblock", name); 100 101 if (fs->fs_magic != FS_MAGIC) { 102 if(fs->fs_magic == bswap32(FS_MAGIC)) { 103 needswap = 1; 104 ffs_sb_swap(fs, fs); 105 } else 106 errx(1, "%s: bad superblock magic number", name); 107 } 108 109 if (fs->fs_ncg < 1) 110 errx(1, "%s: bad ncg in superblock", name); 111 112 if (fs->fs_cpg < 1) 113 errx(1, "%s: bad cpg in superblock", name); 114 115 if (fs->fs_ncg * fs->fs_cpg < fs->fs_ncyl || 116 (fs->fs_ncg - 1) * fs->fs_cpg >= fs->fs_ncyl) 117 errx(1, "%s: bad number of cylinders in superblock", name); 118 119 if (fs->fs_sbsize > SBSIZE) 120 errx(1, "%s: superblock too large", name); 121 } 122 123 124 /* 125 * fixinodes(): 126 * Randomize the inode generation numbers 127 */ 128 static void 129 fixinodes(int fd, struct fs *fs, struct disklabel *lab, int pflag, long xorval) 130 { 131 int inopb = INOPB(fs); 132 int size = inopb * DINODE_SIZE; 133 caddr_t buf; 134 struct dinode *dip; 135 int i; 136 137 if ((buf = malloc(size)) == NULL) 138 err(1, "Out of memory"); 139 140 for (ino = 0, imax = fs->fs_ipg * fs->fs_ncg; ino < imax;) { 141 off_t sp; 142 sp = (off_t) fsbtodb(fs, ino_to_fsba(fs, ino)) * 143 (off_t) lab->d_secsize; 144 145 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 146 err(1, "Seeking to inode %d failed", ino); 147 148 if (read(fd, buf, size) != size) 149 err(1, "Reading inodes %d+%d failed", ino, inopb); 150 151 for (i = 0; i < inopb; i++) { 152 dip = (struct dinode *)(buf + (i * DINODE_SIZE)); 153 if (pflag) 154 printf("inode %10d gen 0x%08x\n", ino, 155 ufs_rw32(dip->di_gen, needswap)); 156 else 157 dip->di_gen = ufs_rw32(random() ^ xorval, 158 needswap); 159 if (++ino > imax) 160 errx(1, "Exceeded number of inodes"); 161 } 162 163 if (pflag) 164 continue; 165 166 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 167 err(1, "Seeking to inode %d failed", ino); 168 169 if (write(fd, buf, size) != size) 170 err(1, "Writing inodes %d+%d failed", ino, inopb); 171 } 172 free(buf); 173 } 174 175 /* 176 * statussig(): 177 * display current status 178 */ 179 void 180 statussig(int dummy) 181 { 182 char msgbuf[256]; 183 int len, deltat; 184 time_t tnow, elapsed; 185 186 (void)time(&tnow); 187 elapsed = tnow - tstart; 188 len = snprintf(msgbuf, sizeof(msgbuf), 189 "fsirand: completed inode %d of %d (%3.2f%%)", 190 ino, imax, (ino * 100.0) / imax); 191 if (imax - ino) { 192 deltat = tstart - tnow + (1.0 * (tnow - tstart)) / ino * imax; 193 len += snprintf(msgbuf + len, sizeof(msgbuf) - len, 194 ", finished in %d:%02d\n", deltat / 60, deltat % 60); 195 } else { 196 len += snprintf(msgbuf + len, sizeof(msgbuf) - len, "\n"); 197 } 198 write(STDERR_FILENO, msgbuf, len); 199 } 200 201 int 202 main(int argc, char *argv[]) 203 { 204 const char *special; 205 char buf[SBSIZE], device[MAXPATHLEN]; 206 struct fs *fs = (struct fs *) buf; 207 struct disklabel lab; 208 long xorval; 209 char *ep; 210 struct timeval tv; 211 int fd, c, Fflag, pflag, openflags; 212 213 xorval = 0; 214 Fflag = pflag = 0; 215 216 while ((c = getopt(argc, argv, "Fpx:")) != -1) 217 switch (c) { 218 case 'F': 219 Fflag++; 220 break; 221 case 'p': 222 pflag++; 223 break; 224 case 'x': 225 xorval = strtol(optarg, &ep, 0); 226 if ((xorval == LONG_MIN || xorval == LONG_MAX) && 227 errno == ERANGE) 228 err(1, "Out of range constant"); 229 if (*ep) 230 errx(1, "Bad constant"); 231 break; 232 default: 233 usage(); 234 } 235 236 argv += optind; 237 argc -= optind; 238 239 if (argc != 1) 240 usage(); 241 242 (void) gettimeofday(&tv, NULL); 243 srandom((unsigned) tv.tv_usec); 244 245 special = argv[0]; 246 openflags = pflag ? O_RDONLY : O_RDWR; 247 if (Fflag) 248 fd = open(special, openflags); 249 else { 250 fd = opendisk(special, openflags, device, sizeof(device), 0); 251 special = device; 252 } 253 if (fd == -1) 254 err(1, "Cannot open `%s'", special); 255 256 if (Fflag) { 257 memset(&lab, 0, sizeof(lab)); 258 lab.d_secsize = DEV_BSIZE; /* XXX */ 259 } else { 260 if (ioctl(fd, DIOCGDINFO, &lab) == -1) 261 err(1, "%s: cannot get disklabel information", special); 262 } 263 264 time(&tstart); 265 (void)signal(SIGINFO, statussig); 266 getsblock(fd, special, fs); 267 fixinodes(fd, fs, &lab, pflag, xorval); 268 269 (void) close(fd); 270 return 0; 271 } 272
Indexes created Fri Oct 31 11:10:07 GMT 2025