tunefs.c revision 1.30
1 /* $NetBSD: tunefs.c,v 1.30 2004/03/21 20:38:08 dsl 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\ 35 The Regents of the University of California. All rights reserved.\n"); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)tunefs.c 8.3 (Berkeley) 5/3/95"; 41 #else 42 __RCSID("$NetBSD: tunefs.c,v 1.30 2004/03/21 20:38:08 dsl Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 /* 47 * tunefs: change layout parameters to an existing file system. 48 */ 49 #include <sys/param.h> 50 51 #include <ufs/ufs/dinode.h> 52 #include <ufs/ffs/fs.h> 53 #include <ufs/ffs/ffs_extern.h> 54 55 #include <machine/bswap.h> 56 57 #include <err.h> 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <fstab.h> 61 #include <paths.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <unistd.h> 66 #include <util.h> 67 68 /* the optimization warning string template */ 69 #define OPTWARN "should optimize for %s with minfree %s %d%%" 70 71 union { 72 struct fs sb; 73 char pad[MAXBSIZE]; 74 } sbun; 75 #define sblock sbun.sb 76 char buf[MAXBSIZE]; 77 78 int fi; 79 long dev_bsize = 512; 80 int needswap = 0; 81 int is_ufs2 = 0; 82 off_t sblockloc; 83 84 static off_t sblock_try[] = SBLOCKSEARCH; 85 86 static void bwrite(daddr_t, char *, int, const char *); 87 static void bread(daddr_t, char *, int, const char *); 88 static int getnum(const char *, const char *, int, int); 89 static void getsb(struct fs *, const char *); 90 static int openpartition(const char *, int, char *, size_t); 91 static void usage(void); 92 int main(int, char *[]); 93 94 int 95 main(int argc, char *argv[]) 96 { 97 #define OPTSTRINGBASE "AFNe:g:h:m:o:" 98 #ifdef TUNEFS_SOFTDEP 99 int softdep; 100 #define OPTSTRING OPTSTRINGBASE ## "n:" 101 #else 102 #define OPTSTRING OPTSTRINGBASE 103 #endif 104 int i, ch, Aflag, Fflag, Nflag, openflags; 105 const char *special, *chg[2]; 106 char device[MAXPATHLEN]; 107 int maxbpg, minfree, optim; 108 int avgfilesize, avgfpdir; 109 110 Aflag = Fflag = Nflag = 0; 111 maxbpg = minfree = optim = -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 'e': 135 maxbpg = getnum(optarg, 136 "maximum blocks per file in a cylinder group", 137 1, INT_MAX); 138 break; 139 140 case 'g': 141 avgfilesize = getnum(optarg, 142 "average file size", 1, INT_MAX); 143 break; 144 145 case 'h': 146 avgfpdir = getnum(optarg, 147 "expected number of files per directory", 148 1, INT_MAX); 149 break; 150 151 case 'm': 152 minfree = getnum(optarg, 153 "minimum percentage of free space", 0, 99); 154 break; 155 156 #ifdef TUNEFS_SOFTDEP 157 case 'n': 158 if (strcmp(optarg, "enable") == 0) 159 softdep = 1; 160 else if (strcmp(optarg, "disable") == 0) 161 softdep = 0; 162 else { 163 errx(10, "bad soft dependencies " 164 "(options are `enable' or `disable')"); 165 } 166 break; 167 #endif 168 169 case 'o': 170 if (strcmp(optarg, chg[FS_OPTSPACE]) == 0) 171 optim = FS_OPTSPACE; 172 else if (strcmp(optarg, chg[FS_OPTTIME]) == 0) 173 optim = FS_OPTTIME; 174 else 175 errx(10, 176 "bad %s (options are `space' or `time')", 177 "optimization preference"); 178 break; 179 180 default: 181 usage(); 182 } 183 } 184 argc -= optind; 185 argv += optind; 186 if (argc != 1) 187 usage(); 188 189 special = argv[0]; 190 openflags = Nflag ? O_RDONLY : O_RDWR; 191 if (Fflag) 192 fi = open(special, openflags); 193 else { 194 fi = openpartition(special, openflags, device, sizeof(device)); 195 special = device; 196 } 197 if (fi == -1) 198 err(1, "%s", special); 199 getsb(&sblock, special); 200 201 #define CHANGEVAL(old, new, type, suffix) do \ 202 if ((new) != -1) { \ 203 if ((new) == (old)) \ 204 warnx("%s remains unchanged at %d%s", \ 205 (type), (old), (suffix)); \ 206 else { \ 207 warnx("%s changes from %d%s to %d%s", \ 208 (type), (old), (suffix), (new), (suffix)); \ 209 (old) = (new); \ 210 } \ 211 } while (/* CONSTCOND */0) 212 213 warnx("tuning %s", special); 214 CHANGEVAL(sblock.fs_maxbpg, maxbpg, 215 "maximum blocks per file in a cylinder group", ""); 216 CHANGEVAL(sblock.fs_minfree, minfree, 217 "minimum percentage of free space", "%"); 218 if (minfree != -1) { 219 if (minfree >= MINFREE && 220 sblock.fs_optim == FS_OPTSPACE) 221 warnx(OPTWARN, "time", ">=", MINFREE); 222 if (minfree < MINFREE && 223 sblock.fs_optim == FS_OPTTIME) 224 warnx(OPTWARN, "space", "<", MINFREE); 225 } 226 #ifdef TUNEFS_SOFTDEP 227 if (softdep == 1) { 228 sblock.fs_flags |= FS_DOSOFTDEP; 229 warnx("soft dependencies set"); 230 } else if (softdep == 0) { 231 sblock.fs_flags &= ~FS_DOSOFTDEP; 232 warnx("soft dependencies cleared"); 233 } 234 #endif 235 if (optim != -1) { 236 if (sblock.fs_optim == optim) { 237 warnx("%s remains unchanged as %s", 238 "optimization preference", 239 chg[optim]); 240 } else { 241 warnx("%s changes from %s to %s", 242 "optimization preference", 243 chg[sblock.fs_optim], chg[optim]); 244 sblock.fs_optim = optim; 245 if (sblock.fs_minfree >= MINFREE && 246 optim == FS_OPTSPACE) 247 warnx(OPTWARN, "time", ">=", MINFREE); 248 if (sblock.fs_minfree < MINFREE && 249 optim == FS_OPTTIME) 250 warnx(OPTWARN, "space", "<", MINFREE); 251 } 252 } 253 CHANGEVAL(sblock.fs_avgfilesize, avgfilesize, 254 "average file size", ""); 255 CHANGEVAL(sblock.fs_avgfpdir, avgfpdir, 256 "expected number of files per directory", ""); 257 258 if (Nflag) { 259 fprintf(stdout, "tunefs: current settings of %s\n", special); 260 fprintf(stdout, "\tmaximum contiguous block count %d\n", 261 sblock.fs_maxcontig); 262 fprintf(stdout, 263 "\tmaximum blocks per file in a cylinder group %d\n", 264 sblock.fs_maxbpg); 265 fprintf(stdout, "\tminimum percentage of free space %d%%\n", 266 sblock.fs_minfree); 267 #ifdef TUNEFS_SOFTDEP 268 fprintf(stdout, "\tsoft dependencies: %s\n", 269 (sblock.fs_flags & FS_DOSOFTDEP) ? "on" : "off"); 270 #endif 271 fprintf(stdout, "\toptimization preference: %s\n", 272 chg[sblock.fs_optim]); 273 fprintf(stdout, "\taverage file size: %d\n", 274 sblock.fs_avgfilesize); 275 fprintf(stdout, 276 "\texpected number of files per directory: %d\n", 277 sblock.fs_avgfpdir); 278 fprintf(stdout, "tunefs: no changes made\n"); 279 exit(0); 280 } 281 282 memcpy(buf, (char *)&sblock, SBLOCKSIZE); 283 if (needswap) 284 ffs_sb_swap((struct fs*)buf, (struct fs*)buf); 285 bwrite(sblockloc, buf, SBLOCKSIZE, special); 286 if (Aflag) 287 for (i = 0; i < sblock.fs_ncg; i++) 288 bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)), 289 buf, SBLOCKSIZE, special); 290 close(fi); 291 exit(0); 292 } 293 294 static int 295 getnum(const char *num, const char *desc, int min, int max) 296 { 297 long n; 298 char *ep; 299 300 n = strtol(num, &ep, 10); 301 if (ep[0] != '\0') 302 errx(1, "Invalid number `%s' for %s", num, desc); 303 if ((int) n < min) 304 errx(1, "%s `%s' too small (minimum is %d)", desc, num, min); 305 if ((int) n > max) 306 errx(1, "%s `%s' too large (maximum is %d)", desc, num, max); 307 return ((int)n); 308 } 309 310 static void 311 usage(void) 312 { 313 314 fprintf(stderr, "usage: tunefs [-AFN] tuneup-options special-device\n"); 315 fprintf(stderr, "where tuneup-options are:\n"); 316 fprintf(stderr, "\t-a maximum contiguous blocks\n"); 317 fprintf(stderr, "\t-d rotational delay between contiguous blocks\n"); 318 fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n"); 319 fprintf(stderr, "\t-g average file size\n"); 320 fprintf(stderr, "\t-h expected number of files per directory\n"); 321 fprintf(stderr, "\t-k track skew in sectors\n"); 322 fprintf(stderr, "\t-m minimum percentage of free space\n"); 323 #ifdef TUNEFS_SOFTDEP 324 fprintf(stderr, "\t-n soft dependencies (`enable' or `disable')\n"); 325 #endif 326 fprintf(stderr, "\t-o optimization preference (`space' or `time')\n"); 327 exit(2); 328 } 329 330 static void 331 getsb(struct fs *fs, const char *file) 332 { 333 int i; 334 335 for (i = 0; ; i++) { 336 if (sblock_try[i] == -1) 337 errx(5, "cannot find filesystem superblock"); 338 bread(sblock_try[i] / dev_bsize, (char *)fs, SBLOCKSIZE, file); 339 switch(fs->fs_magic) { 340 case FS_UFS2_MAGIC: 341 is_ufs2 = 1; 342 /*FALLTHROUGH*/ 343 case FS_UFS1_MAGIC: 344 break; 345 case FS_UFS2_MAGIC_SWAPPED: 346 is_ufs2 = 1; 347 /*FALLTHROUGH*/ 348 case FS_UFS1_MAGIC_SWAPPED: 349 warnx("%s: swapping byte order", file); 350 needswap = 1; 351 ffs_sb_swap(fs, fs); 352 break; 353 default: 354 continue; 355 } 356 if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2) 357 continue; 358 if (fs->fs_old_flags & FS_FLAGS_UPDATED 359 && fs->fs_sblockloc != sblock_try[i]) 360 continue; 361 break; 362 } 363 364 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 365 sblockloc = sblock_try[i] / dev_bsize; 366 } 367 368 static void 369 bwrite(daddr_t blk, char *buffer, int size, const char *file) 370 { 371 off_t offset; 372 373 offset = (off_t)blk * dev_bsize; 374 if (lseek(fi, offset, SEEK_SET) == -1) 375 err(6, "%s: seeking to %lld", file, (long long)offset); 376 if (write(fi, buffer, size) != size) 377 err(7, "%s: writing %d bytes", file, size); 378 } 379 380 static void 381 bread(daddr_t blk, char *buffer, int cnt, const char *file) 382 { 383 off_t offset; 384 int i; 385 386 offset = (off_t)blk * dev_bsize; 387 if (lseek(fi, offset, SEEK_SET) == -1) 388 err(4, "%s: seeking to %lld", file, (long long)offset); 389 if ((i = read(fi, buffer, cnt)) != cnt) 390 errx(5, "%s: short read", file); 391 } 392 393 static int 394 openpartition(const char *name, int flags, char *device, size_t devicelen) 395 { 396 char rawspec[MAXPATHLEN], *p; 397 struct fstab *fs; 398 int fd, oerrno; 399 400 fs = getfsfile(name); 401 if (fs) { 402 if ((p = strrchr(fs->fs_spec, '/')) != NULL) { 403 snprintf(rawspec, sizeof(rawspec), "%.*s/r%s", 404 (int)(p - fs->fs_spec), fs->fs_spec, p + 1); 405 name = rawspec; 406 } else 407 name = fs->fs_spec; 408 } 409 fd = opendisk(name, flags, device, devicelen, 0); 410 if (fd == -1 && errno == ENOENT) { 411 oerrno = errno; 412 strlcpy(device, name, devicelen); 413 errno = oerrno; 414 } 415 return (fd); 416 } 417
Indexes created Tue Sep 30 11:09:46 GMT 2025