fsirand.c revision 1.19
1 /* $NetBSD: fsirand.c,v 1.19 2002/01/08 05:01:50 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 1.19 2002/01/08 05:01:50 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/ufs/dinode.h> 63 #include <ufs/ffs/fs.h> 64 #include <ufs/ffs/ffs_extern.h> 65 66 static void usage(void); 67 static void getsblock(int, const char *, struct fs *); 68 static void fixinodes(int, struct fs *, struct disklabel *, int, long); 69 static void statussig(int); 70 71 int main(int, char *[]); 72 73 int needswap, ino, imax; 74 time_t tstart; 75 76 77 static void 78 usage(void) 79 { 80 81 (void) fprintf(stderr, 82 "Usage: %s [-F] [-p] [-x <constant>] <special>\n", 83 getprogname()); 84 exit(1); 85 } 86 87 88 /* 89 * getsblock(): 90 * Return the superblock 91 */ 92 static void 93 getsblock(int fd, const char *name, struct fs *fs) 94 { 95 96 if (lseek(fd, (off_t) SBOFF , SEEK_SET) == (off_t) -1) 97 err(1, "%s: cannot seek to superblock", name); 98 99 if (read(fd, fs, SBSIZE) != SBSIZE) 100 err(1, "%s: cannot read superblock", name); 101 102 if (fs->fs_magic != FS_MAGIC) { 103 if(fs->fs_magic == bswap32(FS_MAGIC)) { 104 needswap = 1; 105 ffs_sb_swap(fs, fs); 106 } else 107 errx(1, "%s: bad superblock magic number", name); 108 } 109 110 if (fs->fs_ncg < 1) 111 errx(1, "%s: bad ncg in superblock", name); 112 113 if (fs->fs_cpg < 1) 114 errx(1, "%s: bad cpg in superblock", name); 115 116 if (fs->fs_ncg * fs->fs_cpg < fs->fs_ncyl || 117 (fs->fs_ncg - 1) * fs->fs_cpg >= fs->fs_ncyl) 118 errx(1, "%s: bad number of cylinders in superblock", name); 119 120 if (fs->fs_sbsize > SBSIZE) 121 errx(1, "%s: superblock too large", name); 122 } 123 124 125 /* 126 * fixinodes(): 127 * Randomize the inode generation numbers 128 */ 129 static void 130 fixinodes(int fd, struct fs *fs, struct disklabel *lab, int pflag, long xorval) 131 { 132 int inopb = INOPB(fs); 133 int size = inopb * DINODE_SIZE; 134 caddr_t buf; 135 struct dinode *dip; 136 int i; 137 138 if ((buf = malloc(size)) == NULL) 139 err(1, "Out of memory"); 140 141 for (ino = 0, imax = fs->fs_ipg * fs->fs_ncg; ino < imax;) { 142 off_t sp; 143 sp = (off_t) fsbtodb(fs, ino_to_fsba(fs, ino)) * 144 (off_t) lab->d_secsize; 145 146 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 147 err(1, "Seeking to inode %d failed", ino); 148 149 if (read(fd, buf, size) != size) 150 err(1, "Reading inodes %d+%d failed", ino, inopb); 151 152 for (i = 0; i < inopb; i++) { 153 dip = (struct dinode *)(buf + (i * DINODE_SIZE)); 154 if (pflag) 155 printf("inode %10d gen 0x%08x\n", ino, 156 ufs_rw32(dip->di_gen, needswap)); 157 else 158 dip->di_gen = ufs_rw32(random() ^ xorval, 159 needswap); 160 if (++ino > imax) 161 errx(1, "Exceeded number of inodes"); 162 } 163 164 if (pflag) 165 continue; 166 167 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 168 err(1, "Seeking to inode %d failed", ino); 169 170 if (write(fd, buf, size) != size) 171 err(1, "Writing inodes %d+%d failed", ino, inopb); 172 } 173 free(buf); 174 } 175 176 /* 177 * statussig(): 178 * display current status 179 */ 180 void 181 statussig(int dummy) 182 { 183 char msgbuf[256]; 184 int len, deltat; 185 time_t tnow, elapsed; 186 187 (void)time(&tnow); 188 elapsed = tnow - tstart; 189 len = snprintf(msgbuf, sizeof(msgbuf), 190 "fsirand: completed inode %d of %d (%3.2f%%)", 191 ino, imax, (ino * 100.0) / imax); 192 if (imax - ino) { 193 deltat = tstart - tnow + (1.0 * (tnow - tstart)) / ino * imax; 194 len += snprintf(msgbuf + len, sizeof(msgbuf) - len, 195 ", finished in %d:%02d\n", deltat / 60, deltat % 60); 196 } else { 197 len += snprintf(msgbuf + len, sizeof(msgbuf) - len, "\n"); 198 } 199 write(STDERR_FILENO, msgbuf, len); 200 } 201 202 int 203 main(int argc, char *argv[]) 204 { 205 const char *special; 206 char buf[SBSIZE], device[MAXPATHLEN]; 207 struct fs *fs = (struct fs *) buf; 208 struct disklabel lab; 209 long xorval; 210 char *ep; 211 struct timeval tv; 212 int fd, c, Fflag, pflag, openflags; 213 214 xorval = 0; 215 Fflag = pflag = 0; 216 217 while ((c = getopt(argc, argv, "Fpx:")) != -1) 218 switch (c) { 219 case 'F': 220 Fflag++; 221 break; 222 case 'p': 223 pflag++; 224 break; 225 case 'x': 226 xorval = strtol(optarg, &ep, 0); 227 if ((xorval == LONG_MIN || xorval == LONG_MAX) && 228 errno == ERANGE) 229 err(1, "Out of range constant"); 230 if (*ep) 231 errx(1, "Bad constant"); 232 break; 233 default: 234 usage(); 235 } 236 237 argv += optind; 238 argc -= optind; 239 240 if (argc != 1) 241 usage(); 242 243 (void) gettimeofday(&tv, NULL); 244 srandom((unsigned) tv.tv_usec); 245 246 special = argv[0]; 247 openflags = pflag ? O_RDONLY : O_RDWR; 248 if (Fflag) 249 fd = open(special, openflags); 250 else { 251 fd = opendisk(special, openflags, device, sizeof(device), 0); 252 special = device; 253 } 254 if (fd == -1) 255 err(1, "Cannot open `%s'", special); 256 257 if (Fflag) { 258 memset(&lab, 0, sizeof(lab)); 259 lab.d_secsize = DEV_BSIZE; /* XXX */ 260 } else { 261 if (ioctl(fd, DIOCGDINFO, &lab) == -1) 262 err(1, "%s: cannot get disklabel information", special); 263 } 264 265 time(&tstart); 266 (void)signal(SIGINFO, statussig); 267 getsblock(fd, special, fs); 268 fixinodes(fd, fs, &lab, pflag, xorval); 269 270 (void) close(fd); 271 return 0; 272 } 273
Indexes created Sun Sep 28 16:09:52 GMT 2025