tunefs.c revision 1.23
1 /* $NetBSD: tunefs.c,v 1.23 2001/09/03 15:04:39 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 1.23 2001/09/03 15:04:39 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:k:m:n:o:t:" 99 #else 100 #define OPTSTRING "AFNa:d:e: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; 108 109 Aflag = Fflag = Nflag = 0; 110 maxbpg = maxcontig = minfree = rotdelay = optim = trackskew = -1; 111 #ifdef TUNEFS_SOFTDEP 112 softdep = -1; 113 #endif 114 chg[FS_OPTSPACE] = "space"; 115 chg[FS_OPTTIME] = "time"; 116 117 while ((ch = getopt(argc, argv, OPTSTRING)) != -1) { 118 switch (ch) { 119 120 case 'A': 121 Aflag++; 122 break; 123 124 case 'F': 125 Fflag++; 126 break; 127 128 case 'N': 129 Nflag++; 130 break; 131 132 case 'a': 133 maxcontig = getnum(optarg, 134 "maximum contiguous block count", 1, INT_MAX); 135 break; 136 137 case 'd': 138 rotdelay = getnum(optarg, 139 "rotational delay between contiguous blocks", 140 0, INT_MAX); 141 break; 142 143 case 'e': 144 maxbpg = getnum(optarg, 145 "maximum blocks per file in a cylinder group", 146 1, INT_MAX); 147 break; 148 149 150 case 'm': 151 minfree = getnum(optarg, 152 "minimum percentage of free space", 0, 99); 153 break; 154 155 #ifdef TUNEFS_SOFTDEP 156 case 'n': 157 if (strcmp(optarg, "enable") == 0) 158 softdep = 1; 159 else if (strcmp(optarg, "disable") == 0) 160 softdep = 0; 161 else { 162 errx(10, "bad soft dependencies " 163 "(options are `enable' or `disable')"); 164 } 165 break; 166 #endif 167 168 case 'o': 169 if (strcmp(optarg, chg[FS_OPTSPACE]) == 0) 170 optim = FS_OPTSPACE; 171 else if (strcmp(optarg, chg[FS_OPTTIME]) == 0) 172 optim = FS_OPTTIME; 173 else 174 errx(10, 175 "bad %s (options are `space' or `time')", 176 "optimization preference"); 177 break; 178 179 case 'k': 180 case 't': /* for compatibility with old syntax */ 181 trackskew = getnum(optarg, 182 "track skew in sectors", 0, INT_MAX); 183 break; 184 185 default: 186 usage(); 187 } 188 } 189 argc -= optind; 190 argv += optind; 191 if (argc != 1) 192 usage(); 193 194 special = argv[0]; 195 fs = getfsfile(special); 196 if (fs) 197 special = fs->fs_spec; 198 again: 199 if (stat(special, &st) < 0) { 200 if (!Fflag && *special != '/') { 201 if (*special == 'r') 202 special++; 203 (void)snprintf(device, sizeof(device), "%s/%s", 204 _PATH_DEV, special); 205 special = device; 206 goto again; 207 } 208 err(1, "%s", special); 209 } 210 if (Fflag) { 211 if (!S_ISREG(st.st_mode)) 212 errx(10, "%s: not a regular file", special); 213 } else if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) 214 errx(10, "%s: not a block or character device", special); 215 getsb(&sblock, special); 216 217 #define CHANGEVAL(old, new, type, suffix) do \ 218 if ((new) != -1) { \ 219 if ((new) == (old)) \ 220 warnx("%s remains unchanged at %d%s", \ 221 (type), (old), (suffix)); \ 222 else { \ 223 warnx("%s changes from %d%s to %d%s", \ 224 (type), (old), (suffix), (new), (suffix)); \ 225 (old) = (new); \ 226 } \ 227 } while (/* CONSTCOND */0) 228 229 CHANGEVAL(sblock.fs_maxcontig, maxcontig, 230 "maximum contiguous block count", ""); 231 CHANGEVAL(sblock.fs_rotdelay, rotdelay, 232 "rotational delay between contiguous blocks", "ms"); 233 CHANGEVAL(sblock.fs_maxbpg, maxbpg, 234 "maximum blocks per file in a cylinder group", ""); 235 CHANGEVAL(sblock.fs_minfree, minfree, 236 "minimum percentage of free space", "%"); 237 if (minfree != -1) { 238 if (minfree >= MINFREE && 239 sblock.fs_optim == FS_OPTSPACE) 240 warnx(OPTWARN, "time", ">=", MINFREE); 241 if (minfree < MINFREE && 242 sblock.fs_optim == FS_OPTTIME) 243 warnx(OPTWARN, "space", "<", MINFREE); 244 } 245 #ifdef TUNEFS_SOFTDEP 246 if (softdep == 1) { 247 sblock.fs_flags |= FS_DOSOFTDEP; 248 warnx("soft dependencies set"); 249 } else if (softdep == 0) { 250 sblock.fs_flags &= ~FS_DOSOFTDEP; 251 warnx("soft dependencies cleared"); 252 } 253 #endif 254 if (optim != -1) { 255 if (sblock.fs_optim == optim) { 256 warnx("%s remains unchanged as %s", 257 "optimization preference", 258 chg[optim]); 259 } else { 260 warnx("%s changes from %s to %s", 261 "optimization preference", 262 chg[sblock.fs_optim], chg[optim]); 263 sblock.fs_optim = optim; 264 if (sblock.fs_minfree >= MINFREE && 265 optim == FS_OPTSPACE) 266 warnx(OPTWARN, "time", ">=", MINFREE); 267 if (sblock.fs_minfree < MINFREE && 268 optim == FS_OPTTIME) 269 warnx(OPTWARN, "space", "<", MINFREE); 270 } 271 } 272 CHANGEVAL(sblock.fs_trackskew, trackskew, 273 "track skew in sectors", ""); 274 275 if (Nflag) { 276 fprintf(stdout, "tunefs: current settings of %s\n", special); 277 fprintf(stdout, "\tmaximum contiguous block count %d\n", 278 sblock.fs_maxcontig); 279 fprintf(stdout, 280 "\trotational delay between contiguous blocks %dms\n", 281 sblock.fs_rotdelay); 282 fprintf(stdout, 283 "\tmaximum blocks per file in a cylinder group %d\n", 284 sblock.fs_maxbpg); 285 fprintf(stdout, "\tminimum percentage of free space %d%%\n", 286 sblock.fs_minfree); 287 #ifdef TUNEFS_SOFTDEP 288 fprintf(stdout, "\tsoft dependencies: %s\n", 289 (sblock.fs_flags & FS_DOSOFTDEP) ? "on" : "off"); 290 #endif 291 fprintf(stdout, "\toptimization preference: %s\n", 292 chg[sblock.fs_optim]); 293 fprintf(stdout, "\ttrack skew %d sectors\n", 294 sblock.fs_trackskew); 295 fprintf(stdout, "tunefs: no changes made\n"); 296 exit(0); 297 } 298 299 fi = open(special, 1); 300 if (fi < 0) 301 err(3, "cannot open %s for writing", special); 302 memcpy(buf, (char *)&sblock, SBSIZE); 303 if (needswap) 304 ffs_sb_swap((struct fs*)buf, (struct fs*)buf); 305 bwrite((daddr_t)SBOFF / dev_bsize, buf, SBSIZE); 306 if (Aflag) 307 for (i = 0; i < sblock.fs_ncg; i++) 308 bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)), 309 buf, SBSIZE); 310 close(fi); 311 exit(0); 312 } 313 314 static int 315 getnum(const char *num, const char *desc, int min, int max) 316 { 317 long n; 318 char *ep; 319 320 n = strtol(num, &ep, 10); 321 if (ep[0] != '\0') 322 errx(1, "Invalid number `%s' for %s", num, desc); 323 if ((int) n < min) 324 errx(1, "%s `%s' too small (minimum is %d)", desc, num, min); 325 if ((int) n > max) 326 errx(1, "%s `%s' too large (maximum is %d)", desc, num, max); 327 return ((int)n); 328 } 329 330 static void 331 usage(void) 332 { 333 334 fprintf(stderr, "Usage: tunefs [-AFN] tuneup-options special-device\n"); 335 fprintf(stderr, "where tuneup-options are:\n"); 336 fprintf(stderr, "\t-a maximum contiguous blocks\n"); 337 fprintf(stderr, "\t-d rotational delay between contiguous blocks\n"); 338 fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n"); 339 fprintf(stderr, "\t-k track skew in sectors\n"); 340 fprintf(stderr, "\t-m minimum percentage of free space\n"); 341 #ifdef TUNEFS_SOFTDEP 342 fprintf(stderr, "\t-n soft dependencies (`enable' or `disable')\n"); 343 #endif 344 fprintf(stderr, "\t-o optimization preference (`space' or `time')\n"); 345 exit(2); 346 } 347 348 static void 349 getsb(struct fs *fs, const char *file) 350 { 351 352 fi = open(file, 0); 353 if (fi < 0) 354 err(3, "cannot open %s for reading", file); 355 if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE)) 356 err(4, "%s: bad super block", file); 357 if (fs->fs_magic != FS_MAGIC) { 358 if (fs->fs_magic == bswap32(FS_MAGIC)) { 359 warnx("%s: swapping byte order", file); 360 needswap = 1; 361 ffs_sb_swap(fs, fs); 362 } else 363 err(5, "%s: bad magic number", file); 364 } 365 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 366 close(fi); 367 } 368 369 static void 370 bwrite(daddr_t blk, char *buffer, int size) 371 { 372 373 if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0) 374 err(6, "FS SEEK"); 375 if (write(fi, buffer, size) != size) 376 err(7, "FS WRITE"); 377 } 378 379 static int 380 bread(daddr_t bno, char *buffer, int cnt) 381 { 382 int i; 383 384 if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0) 385 return(1); 386 if ((i = read(fi, buffer, cnt)) != cnt) { 387 for(i=0; i<sblock.fs_bsize; i++) 388 buf[i] = 0; 389 return (1); 390 } 391 return (0); 392 } 393
Indexes created Tue Sep 30 20:09:53 GMT 2025