tunefs.c revision 1.24
1 /* $NetBSD: tunefs.c,v 1.24 2001/09/06 02:16:01 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)tunefs.c 8.3 (Berkeley) 5/3/95"; 45 #else 46 __RCSID("$NetBSD: tunefs.c,v 1.24 2001/09/06 02:16:01 lukem Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 /* 51 * tunefs: change layout parameters to an existing file system. 52 */ 53 #include <sys/param.h> 54 #include <sys/stat.h> 55 56 #include <ufs/ufs/dinode.h> 57 #include <ufs/ffs/fs.h> 58 #include <ufs/ffs/ffs_extern.h> 59 60 #include <machine/bswap.h> 61 62 #include <err.h> 63 #include <errno.h> 64 #include <fcntl.h> 65 #include <fstab.h> 66 #include <paths.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <unistd.h> 71 72 /* the optimization warning string template */ 73 #define OPTWARN "should optimize for %s with minfree %s %d%%" 74 75 union { 76 struct fs sb; 77 char pad[MAXBSIZE]; 78 } sbun; 79 #define sblock sbun.sb 80 char buf[MAXBSIZE]; 81 82 int fi; 83 long dev_bsize = 1; 84 int needswap = 0; 85 86 static void bwrite(daddr_t, char *, int); 87 static int bread(daddr_t, char *, int); 88 static int getnum(const char *, const char *, int, int); 89 static void getsb(struct fs *, const char *); 90 static void usage(void); 91 int main(int, char *[]); 92 93 int 94 main(int argc, char *argv[]) 95 { 96 #ifdef TUNEFS_SOFTDEP 97 int softdep; 98 #define OPTSTRING "AFNa:d:e:g:h:k:m:n:o:t:" 99 #else 100 #define OPTSTRING "AFNa:d:e:g:h:k:m:o:t:" 101 #endif 102 struct stat st; 103 int i, ch, Aflag, Fflag, Nflag; 104 struct fstab *fs; 105 const char *special, *chg[2]; 106 char device[MAXPATHLEN]; 107 int maxbpg, maxcontig, minfree, rotdelay, optim, trackskew; 108 int avgfilesize, avgfpdir; 109 110 Aflag = Fflag = Nflag = 0; 111 maxbpg = maxcontig = minfree = rotdelay = optim = trackskew = -1; 112 avgfilesize = avgfpdir = -1; 113 #ifdef TUNEFS_SOFTDEP 114 softdep = -1; 115 #endif 116 chg[FS_OPTSPACE] = "space"; 117 chg[FS_OPTTIME] = "time"; 118 119 while ((ch = getopt(argc, argv, OPTSTRING)) != -1) { 120 switch (ch) { 121 122 case 'A': 123 Aflag++; 124 break; 125 126 case 'F': 127 Fflag++; 128 break; 129 130 case 'N': 131 Nflag++; 132 break; 133 134 case 'a': 135 maxcontig = getnum(optarg, 136 "maximum contiguous block count", 1, INT_MAX); 137 break; 138 139 case 'd': 140 rotdelay = getnum(optarg, 141 "rotational delay between contiguous blocks", 142 0, INT_MAX); 143 break; 144 145 case 'e': 146 maxbpg = getnum(optarg, 147 "maximum blocks per file in a cylinder group", 148 1, INT_MAX); 149 break; 150 151 case 'g': 152 avgfilesize = getnum(optarg, 153 "average file size", 1, INT_MAX); 154 break; 155 156 case 'h': 157 avgfpdir = getnum(optarg, 158 "expected number of files per directory", 159 1, INT_MAX); 160 break; 161 162 case 'm': 163 minfree = getnum(optarg, 164 "minimum percentage of free space", 0, 99); 165 break; 166 167 #ifdef TUNEFS_SOFTDEP 168 case 'n': 169 if (strcmp(optarg, "enable") == 0) 170 softdep = 1; 171 else if (strcmp(optarg, "disable") == 0) 172 softdep = 0; 173 else { 174 errx(10, "bad soft dependencies " 175 "(options are `enable' or `disable')"); 176 } 177 break; 178 #endif 179 180 case 'o': 181 if (strcmp(optarg, chg[FS_OPTSPACE]) == 0) 182 optim = FS_OPTSPACE; 183 else if (strcmp(optarg, chg[FS_OPTTIME]) == 0) 184 optim = FS_OPTTIME; 185 else 186 errx(10, 187 "bad %s (options are `space' or `time')", 188 "optimization preference"); 189 break; 190 191 case 'k': 192 case 't': /* for compatibility with old syntax */ 193 trackskew = getnum(optarg, 194 "track skew in sectors", 0, INT_MAX); 195 break; 196 197 default: 198 usage(); 199 } 200 } 201 argc -= optind; 202 argv += optind; 203 if (argc != 1) 204 usage(); 205 206 special = argv[0]; 207 fs = getfsfile(special); 208 if (fs) 209 special = fs->fs_spec; 210 again: 211 if (stat(special, &st) < 0) { 212 if (!Fflag && *special != '/') { 213 if (*special == 'r') 214 special++; 215 (void)snprintf(device, sizeof(device), "%s/%s", 216 _PATH_DEV, special); 217 special = device; 218 goto again; 219 } 220 err(1, "%s", special); 221 } 222 if (Fflag) { 223 if (!S_ISREG(st.st_mode)) 224 errx(10, "%s: not a regular file", special); 225 } else if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) 226 errx(10, "%s: not a block or character device", special); 227 getsb(&sblock, special); 228 229 #define CHANGEVAL(old, new, type, suffix) do \ 230 if ((new) != -1) { \ 231 if ((new) == (old)) \ 232 warnx("%s remains unchanged at %d%s", \ 233 (type), (old), (suffix)); \ 234 else { \ 235 warnx("%s changes from %d%s to %d%s", \ 236 (type), (old), (suffix), (new), (suffix)); \ 237 (old) = (new); \ 238 } \ 239 } while (/* CONSTCOND */0) 240 241 CHANGEVAL(sblock.fs_maxcontig, maxcontig, 242 "maximum contiguous block count", ""); 243 CHANGEVAL(sblock.fs_rotdelay, rotdelay, 244 "rotational delay between contiguous blocks", "ms"); 245 CHANGEVAL(sblock.fs_maxbpg, maxbpg, 246 "maximum blocks per file in a cylinder group", ""); 247 CHANGEVAL(sblock.fs_minfree, minfree, 248 "minimum percentage of free space", "%"); 249 if (minfree != -1) { 250 if (minfree >= MINFREE && 251 sblock.fs_optim == FS_OPTSPACE) 252 warnx(OPTWARN, "time", ">=", MINFREE); 253 if (minfree < MINFREE && 254 sblock.fs_optim == FS_OPTTIME) 255 warnx(OPTWARN, "space", "<", MINFREE); 256 } 257 #ifdef TUNEFS_SOFTDEP 258 if (softdep == 1) { 259 sblock.fs_flags |= FS_DOSOFTDEP; 260 warnx("soft dependencies set"); 261 } else if (softdep == 0) { 262 sblock.fs_flags &= ~FS_DOSOFTDEP; 263 warnx("soft dependencies cleared"); 264 } 265 #endif 266 if (optim != -1) { 267 if (sblock.fs_optim == optim) { 268 warnx("%s remains unchanged as %s", 269 "optimization preference", 270 chg[optim]); 271 } else { 272 warnx("%s changes from %s to %s", 273 "optimization preference", 274 chg[sblock.fs_optim], chg[optim]); 275 sblock.fs_optim = optim; 276 if (sblock.fs_minfree >= MINFREE && 277 optim == FS_OPTSPACE) 278 warnx(OPTWARN, "time", ">=", MINFREE); 279 if (sblock.fs_minfree < MINFREE && 280 optim == FS_OPTTIME) 281 warnx(OPTWARN, "space", "<", MINFREE); 282 } 283 } 284 CHANGEVAL(sblock.fs_trackskew, trackskew, 285 "track skew in sectors", ""); 286 CHANGEVAL(sblock.fs_avgfilesize, avgfilesize, 287 "average file size", ""); 288 CHANGEVAL(sblock.fs_avgfpdir, avgfpdir, 289 "expected number of files per directory", ""); 290 291 if (Nflag) { 292 fprintf(stdout, "tunefs: current settings of %s\n", special); 293 fprintf(stdout, "\tmaximum contiguous block count %d\n", 294 sblock.fs_maxcontig); 295 fprintf(stdout, 296 "\trotational delay between contiguous blocks %dms\n", 297 sblock.fs_rotdelay); 298 fprintf(stdout, 299 "\tmaximum blocks per file in a cylinder group %d\n", 300 sblock.fs_maxbpg); 301 fprintf(stdout, "\tminimum percentage of free space %d%%\n", 302 sblock.fs_minfree); 303 #ifdef TUNEFS_SOFTDEP 304 fprintf(stdout, "\tsoft dependencies: %s\n", 305 (sblock.fs_flags & FS_DOSOFTDEP) ? "on" : "off"); 306 #endif 307 fprintf(stdout, "\toptimization preference: %s\n", 308 chg[sblock.fs_optim]); 309 fprintf(stdout, "\taverage file size: %d\n", 310 sblock.fs_avgfilesize); 311 fprintf(stdout, 312 "\texpected number of files per directory: %d\n", 313 sblock.fs_avgfpdir); 314 fprintf(stdout, "\ttrack skew %d sectors\n", 315 sblock.fs_trackskew); 316 fprintf(stdout, "tunefs: no changes made\n"); 317 exit(0); 318 } 319 320 fi = open(special, 1); 321 if (fi < 0) 322 err(3, "cannot open %s for writing", special); 323 memcpy(buf, (char *)&sblock, SBSIZE); 324 if (needswap) 325 ffs_sb_swap((struct fs*)buf, (struct fs*)buf); 326 bwrite((daddr_t)SBOFF / dev_bsize, buf, SBSIZE); 327 if (Aflag) 328 for (i = 0; i < sblock.fs_ncg; i++) 329 bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)), 330 buf, SBSIZE); 331 close(fi); 332 exit(0); 333 } 334 335 static int 336 getnum(const char *num, const char *desc, int min, int max) 337 { 338 long n; 339 char *ep; 340 341 n = strtol(num, &ep, 10); 342 if (ep[0] != '\0') 343 errx(1, "Invalid number `%s' for %s", num, desc); 344 if ((int) n < min) 345 errx(1, "%s `%s' too small (minimum is %d)", desc, num, min); 346 if ((int) n > max) 347 errx(1, "%s `%s' too large (maximum is %d)", desc, num, max); 348 return ((int)n); 349 } 350 351 static void 352 usage(void) 353 { 354 355 fprintf(stderr, "Usage: tunefs [-AFN] tuneup-options special-device\n"); 356 fprintf(stderr, "where tuneup-options are:\n"); 357 fprintf(stderr, "\t-a maximum contiguous blocks\n"); 358 fprintf(stderr, "\t-d rotational delay between contiguous blocks\n"); 359 fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n"); 360 fprintf(stderr, "\t-g average file size\n"); 361 fprintf(stderr, "\t-h expected number of files per directory\n"); 362 fprintf(stderr, "\t-k track skew in sectors\n"); 363 fprintf(stderr, "\t-m minimum percentage of free space\n"); 364 #ifdef TUNEFS_SOFTDEP 365 fprintf(stderr, "\t-n soft dependencies (`enable' or `disable')\n"); 366 #endif 367 fprintf(stderr, "\t-o optimization preference (`space' or `time')\n"); 368 exit(2); 369 } 370 371 static void 372 getsb(struct fs *fs, const char *file) 373 { 374 375 fi = open(file, 0); 376 if (fi < 0) 377 err(3, "cannot open %s for reading", file); 378 if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE)) 379 err(4, "%s: bad super block", file); 380 if (fs->fs_magic != FS_MAGIC) { 381 if (fs->fs_magic == bswap32(FS_MAGIC)) { 382 warnx("%s: swapping byte order", file); 383 needswap = 1; 384 ffs_sb_swap(fs, fs); 385 } else 386 err(5, "%s: bad magic number", file); 387 } 388 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 389 close(fi); 390 } 391 392 static void 393 bwrite(daddr_t blk, char *buffer, int size) 394 { 395 396 if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0) 397 err(6, "FS SEEK"); 398 if (write(fi, buffer, size) != size) 399 err(7, "FS WRITE"); 400 } 401 402 static int 403 bread(daddr_t bno, char *buffer, int cnt) 404 { 405 int i; 406 407 if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0) 408 return(1); 409 if ((i = read(fi, buffer, cnt)) != cnt) { 410 for(i=0; i<sblock.fs_bsize; i++) 411 buf[i] = 0; 412 return (1); 413 } 414 return (0); 415 } 416
Indexes created Tue Sep 30 20:09:53 GMT 2025