fsirand.c revision 1.24
1 /* $NetBSD: fsirand.c,v 1.24 2004/03/21 20:12:16 dsl 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 1.24 2004/03/21 20:12:16 dsl 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, is_ufs2; 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 static const off_t sblock_try[] = SBLOCKSEARCH; 89 90 /* 91 * getsblock(): 92 * Return the superblock 93 */ 94 static void 95 getsblock(int fd, const char *name, struct fs *fs) 96 { 97 int i; 98 99 for (i = 0; ; i++) { 100 if (sblock_try[i] == -1) 101 errx(1, "%s: can't find superblock", name); 102 if (pread(fd, fs, SBLOCKSIZE, sblock_try[i]) != SBLOCKSIZE) 103 continue; 104 105 switch(fs->fs_magic) { 106 case FS_UFS2_MAGIC: 107 is_ufs2 = 1; 108 /* FALLTHROUGH */ 109 case FS_UFS1_MAGIC: 110 break; 111 case FS_UFS2_MAGIC_SWAPPED: 112 is_ufs2 = 1; 113 /* FALLTHROUGH */ 114 case FS_UFS1_MAGIC_SWAPPED: 115 needswap = 1; 116 ffs_sb_swap(fs, fs); 117 break; 118 default: 119 continue; 120 } 121 122 if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2) 123 continue; 124 break; 125 } 126 127 if (fs->fs_ncg < 1) 128 errx(1, "%s: bad ncg in superblock", name); 129 130 if (fs->fs_sbsize > SBLOCKSIZE) 131 errx(1, "%s: superblock too large", name); 132 } 133 134 135 /* 136 * fixinodes(): 137 * Randomize the inode generation numbers 138 */ 139 static void 140 fixinodes(int fd, struct fs *fs, struct disklabel *lab, int pflag, long xorval) 141 { 142 int inopb = INOPB(fs); 143 int size; 144 caddr_t buf; 145 struct ufs1_dinode *dp1; 146 struct ufs2_dinode *dp2; 147 int i; 148 149 size = is_ufs2 ? inopb * sizeof (struct ufs2_dinode) : 150 inopb * sizeof (struct ufs1_dinode); 151 152 if ((buf = malloc(size)) == NULL) 153 err(1, "Out of memory"); 154 155 if (is_ufs2) 156 dp2 = (struct ufs2_dinode *)buf; 157 else 158 dp1 = (struct ufs1_dinode *)buf; 159 160 for (ino = 0, imax = fs->fs_ipg * fs->fs_ncg; ino < imax;) { 161 off_t sp; 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 if (is_ufs2) { 173 if (pflag) 174 printf("inode %10d gen 0x%08x\n", 175 ino, 176 ufs_rw32(dp2[i].di_gen, needswap)); 177 else 178 dp2[i].di_gen = 179 ufs_rw32((arc4random() & INT32_MAX)^ xorval, 180 needswap); 181 } else { 182 if (pflag) 183 printf("inode %10d gen 0x%08x\n", 184 ino, 185 ufs_rw32(dp1[i].di_gen, needswap)); 186 else 187 dp1[i].di_gen = 188 ufs_rw32((arc4random() & INT32_MAX) ^ xorval, 189 needswap); 190 } 191 if (++ino > imax) 192 errx(1, "Exceeded number of inodes"); 193 } 194 195 if (pflag) 196 continue; 197 198 if (lseek(fd, sp, SEEK_SET) == (off_t) -1) 199 err(1, "Seeking to inode %d failed", ino); 200 201 if (write(fd, buf, size) != size) 202 err(1, "Writing inodes %d+%d failed", ino, inopb); 203 } 204 free(buf); 205 } 206 207 /* 208 * statussig(): 209 * display current status 210 */ 211 void 212 statussig(int dummy) 213 { 214 char msgbuf[256]; 215 int len, deltat; 216 time_t tnow, elapsed; 217 218 (void)time(&tnow); 219 elapsed = tnow - tstart; 220 len = snprintf(msgbuf, sizeof(msgbuf), 221 "fsirand: completed inode %d of %d (%3.2f%%)", 222 ino, imax, (ino * 100.0) / imax); 223 if (imax - ino) { 224 deltat = tstart - tnow + (1.0 * (tnow - tstart)) / ino * imax; 225 len += snprintf(msgbuf + len, sizeof(msgbuf) - len, 226 ", finished in %d:%02d\n", deltat / 60, deltat % 60); 227 } else { 228 len += snprintf(msgbuf + len, sizeof(msgbuf) - len, "\n"); 229 } 230 write(STDERR_FILENO, msgbuf, len); 231 } 232 233 int 234 main(int argc, char *argv[]) 235 { 236 const char *special; 237 char buf[SBLOCKSIZE], device[MAXPATHLEN]; 238 struct fs *fs = (struct fs *) buf; 239 struct disklabel lab; 240 long xorval; 241 char *ep; 242 int fd, c, Fflag, pflag, openflags; 243 244 xorval = 0; 245 Fflag = pflag = 0; 246 247 while ((c = getopt(argc, argv, "Fpx:")) != -1) 248 switch (c) { 249 case 'F': 250 Fflag++; 251 break; 252 case 'p': 253 pflag++; 254 break; 255 case 'x': 256 errno = 0; 257 xorval = strtol(optarg, &ep, 0); 258 if ((xorval == LONG_MIN || xorval == LONG_MAX) && 259 errno == ERANGE) 260 err(1, "Out of range constant"); 261 if (*ep) 262 errx(1, "Bad constant"); 263 break; 264 default: 265 usage(); 266 } 267 268 argv += optind; 269 argc -= optind; 270 271 if (argc != 1) 272 usage(); 273 274 special = argv[0]; 275 openflags = pflag ? O_RDONLY : O_RDWR; 276 if (Fflag) 277 fd = open(special, openflags); 278 else { 279 fd = opendisk(special, openflags, device, sizeof(device), 0); 280 special = device; 281 } 282 if (fd == -1) 283 err(1, "Cannot open `%s'", special); 284 285 if (Fflag) { 286 memset(&lab, 0, sizeof(lab)); 287 lab.d_secsize = DEV_BSIZE; /* XXX */ 288 } else { 289 if (ioctl(fd, DIOCGDINFO, &lab) == -1) 290 err(1, "%s: cannot get disklabel information", special); 291 } 292 293 time(&tstart); 294 (void)signal(SIGINFO, statussig); 295 getsblock(fd, special, fs); 296 fixinodes(fd, fs, &lab, pflag, xorval); 297 298 (void) close(fd); 299 return 0; 300 } 301
Indexes created Sun Sep 28 07:09:56 GMT 2025