tunefs.c revision 1.20
1 /* $NetBSD: tunefs.c,v 1.20 2000/06/15 22:37:17 fvdl 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 1.20 2000/06/15 22:37:17 fvdl 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 <errno.h> 63 #include <err.h> 64 #include <fcntl.h> 65 #include <fstab.h> 66 #include <stdio.h> 67 #include <paths.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 void bwrite __P((daddr_t, char *, int)); 87 int bread __P((daddr_t, char *, int)); 88 void getsb __P((struct fs *, const char *)); 89 int main __P((int, char *[])); 90 void usage __P((void)); 91 92 int 93 main(argc, argv) 94 int argc; 95 char *argv[]; 96 { 97 char *cp, *name; 98 #ifdef TUNEFS_SOFTDEP 99 char *action; 100 #endif 101 const char *special; 102 struct stat st; 103 int i; 104 int Aflag = 0, Nflag = 0; 105 struct fstab *fs; 106 char *chg[2], device[MAXPATHLEN]; 107 108 argc--, argv++; 109 if (argc < 2) 110 usage(); 111 special = argv[argc - 1]; 112 fs = getfsfile(special); 113 if (fs) 114 special = fs->fs_spec; 115 again: 116 if (stat(special, &st) < 0) { 117 if (*special != '/') { 118 if (*special == 'r') 119 special++; 120 (void)snprintf(device, sizeof(device), "%s/%s", 121 _PATH_DEV, special); 122 special = device; 123 goto again; 124 } 125 err(1, "%s", special); 126 } 127 if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode)) 128 errx(10, "%s: not a block or character device", special); 129 getsb(&sblock, special); 130 chg[FS_OPTSPACE] = "space"; 131 chg[FS_OPTTIME] = "time"; 132 for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) { 133 for (cp = &argv[0][1]; *cp; cp++) 134 switch (*cp) { 135 136 case 'A': 137 Aflag++; 138 continue; 139 140 case 'N': 141 Nflag++; 142 continue; 143 144 case 'a': 145 name = "maximum contiguous block count"; 146 if (argc < 1) 147 errx(10, "-a: missing %s", name); 148 argc--, argv++; 149 i = atoi(*argv); 150 if (i < 1) 151 errx(10, "%s must be >= 1 (was %s)", 152 name, *argv); 153 warnx("%s changes from %d to %d", 154 name, sblock.fs_maxcontig, i); 155 sblock.fs_maxcontig = i; 156 continue; 157 158 case 'd': 159 name = 160 "rotational delay between contiguous blocks"; 161 if (argc < 1) 162 errx(10, "-d: missing %s", name); 163 argc--, argv++; 164 i = atoi(*argv); 165 warnx("%s changes from %dms to %dms", 166 name, sblock.fs_rotdelay, i); 167 sblock.fs_rotdelay = i; 168 continue; 169 170 case 'e': 171 name = 172 "maximum blocks per file in a cylinder group"; 173 if (argc < 1) 174 errx(10, "-e: missing %s", name); 175 argc--, argv++; 176 i = atoi(*argv); 177 if (i < 1) 178 errx(10, "%s must be >= 1 (was %s)", 179 name, *argv); 180 warnx("%s changes from %d to %d", 181 name, sblock.fs_maxbpg, i); 182 sblock.fs_maxbpg = i; 183 continue; 184 185 case 'm': 186 name = "minimum percentage of free space"; 187 if (argc < 1) 188 errx(10, "-m: missing %s", name); 189 argc--, argv++; 190 i = atoi(*argv); 191 if (i < 0 || i > 99) 192 errx(10, "bad %s (%s)", name, *argv); 193 warnx("%s changes from %d%% to %d%%", 194 name, sblock.fs_minfree, i); 195 sblock.fs_minfree = i; 196 if (i >= MINFREE && 197 sblock.fs_optim == FS_OPTSPACE) 198 warnx(OPTWARN, "time", ">=", MINFREE); 199 if (i < MINFREE && 200 sblock.fs_optim == FS_OPTTIME) 201 warnx(OPTWARN, "space", "<", MINFREE); 202 continue; 203 #ifdef TUNEFS_SOFTDEP 204 case 'n': 205 name = "soft dependencies"; 206 if (argc < 1) 207 errx(10, "-n: missing %s", name); 208 argc--, argv++; 209 if (strcmp(*argv, "enable") == 0) { 210 sblock.fs_flags |= FS_DOSOFTDEP; 211 action = "set"; 212 } else if (strcmp(*argv, "disable") == 0) { 213 sblock.fs_flags &= ~FS_DOSOFTDEP; 214 action = "cleared"; 215 } else { 216 errx(10, "bad %s (options are %s)", 217 name, "`enable' or `disable'"); 218 } 219 warnx("%s %s", name, action); 220 continue; 221 #endif 222 223 case 'o': 224 name = "optimization preference"; 225 if (argc < 1) 226 errx(10, "-o: missing %s", name); 227 argc--, argv++; 228 if (strcmp(*argv, chg[FS_OPTSPACE]) == 0) 229 i = FS_OPTSPACE; 230 else if (strcmp(*argv, chg[FS_OPTTIME]) == 0) 231 i = FS_OPTTIME; 232 else 233 errx(10, "bad %s (options are `space' or `time')", 234 name); 235 if (sblock.fs_optim == i) { 236 warnx("%s remains unchanged as %s", 237 name, chg[i]); 238 continue; 239 } 240 warnx("%s changes from %s to %s", 241 name, chg[sblock.fs_optim], chg[i]); 242 sblock.fs_optim = i; 243 if (sblock.fs_minfree >= MINFREE && 244 i == FS_OPTSPACE) 245 warnx(OPTWARN, "time", ">=", MINFREE); 246 if (sblock.fs_minfree < MINFREE && 247 i == FS_OPTTIME) 248 warnx(OPTWARN, "space", "<", MINFREE); 249 continue; 250 251 case 't': 252 name = "track skew in sectors"; 253 if (argc < 1) 254 errx(10, "-t: missing %s", name); 255 argc--, argv++; 256 i = atoi(*argv); 257 if (i < 0) 258 errx(10, "%s: %s must be >= 0", 259 *argv, name); 260 warnx("%s changes from %d to %d", 261 name, sblock.fs_trackskew, i); 262 sblock.fs_trackskew = i; 263 continue; 264 265 default: 266 usage(); 267 } 268 } 269 if (argc != 1) 270 usage(); 271 if (Nflag) { 272 fprintf(stdout, "tunefs: current settings\n"); 273 fprintf(stdout, "\tmaximum contiguous block count %d\n", 274 sblock.fs_maxcontig); 275 fprintf(stdout, 276 "\trotational delay between contiguous blocks %dms\n", 277 sblock.fs_rotdelay); 278 fprintf(stdout, 279 "\tmaximum blocks per file in a cylinder group %d\n", 280 sblock.fs_maxbpg); 281 fprintf(stdout, "\tminimum percentage of free space %d%%\n", 282 sblock.fs_minfree); 283 #ifdef TUNEFS_SOFTDEP 284 fprintf(stdout, "\tsoft dependencies: %s\n", 285 (sblock.fs_flags & FS_DOSOFTDEP) ? "on" : "off"); 286 #endif 287 fprintf(stdout, "\toptimization preference: %s\n", 288 chg[sblock.fs_optim]); 289 fprintf(stdout, "\ttrack skew %d sectors\n", 290 sblock.fs_trackskew); 291 fprintf(stdout, "tunefs: no changes made\n"); 292 exit(0); 293 } 294 fi = open(special, 1); 295 if (fi < 0) 296 err(3, "cannot open %s for writing", special); 297 memcpy(buf, (char *)&sblock, SBSIZE); 298 if (needswap) 299 ffs_sb_swap((struct fs*)buf, (struct fs*)buf, 1); 300 bwrite((daddr_t)SBOFF / dev_bsize, buf, SBSIZE); 301 if (Aflag) 302 for (i = 0; i < sblock.fs_ncg; i++) 303 bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)), 304 buf, SBSIZE); 305 close(fi); 306 exit(0); 307 } 308 309 void 310 usage() 311 { 312 313 fprintf(stderr, "Usage: tunefs [-AN] tuneup-options special-device\n"); 314 fprintf(stderr, "where tuneup-options are:\n"); 315 fprintf(stderr, "\t-d rotational delay between contiguous blocks\n"); 316 fprintf(stderr, "\t-a maximum contiguous blocks\n"); 317 fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n"); 318 fprintf(stderr, "\t-m minimum percentage of free space\n"); 319 fprintf(stderr, "\t-o optimization preference (`space' or `time')\n"); 320 #ifdef TUNEFS_SOFTDEP 321 fprintf(stderr, "\t-n soft dependencies (`enable' or `disable')\n"); 322 #endif 323 fprintf(stderr, "\t-t track skew in sectors\n"); 324 exit(2); 325 } 326 327 void 328 getsb(fs, file) 329 struct fs *fs; 330 const char *file; 331 { 332 333 fi = open(file, 0); 334 if (fi < 0) 335 err(3, "cannot open %s for reading", file); 336 if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE)) 337 err(4, "%s: bad super block", file); 338 if (fs->fs_magic != FS_MAGIC) { 339 if (fs->fs_magic == bswap32(FS_MAGIC)) { 340 needswap = 1; 341 ffs_sb_swap(fs, fs, 0); 342 } else 343 err(5, "%s: bad magic number", file); 344 } 345 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 346 close(fi); 347 } 348 349 void 350 bwrite(blk, buf, size) 351 daddr_t blk; 352 char *buf; 353 int size; 354 { 355 356 if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0) 357 err(6, "FS SEEK"); 358 if (write(fi, buf, size) != size) 359 err(7, "FS WRITE"); 360 } 361 362 int 363 bread(bno, buf, cnt) 364 daddr_t bno; 365 char *buf; 366 int cnt; 367 { 368 int i; 369 370 if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0) 371 return(1); 372 if ((i = read(fi, buf, cnt)) != cnt) { 373 for(i=0; i<sblock.fs_bsize; i++) 374 buf[i] = 0; 375 return (1); 376 } 377 return (0); 378 } 379
Indexes created Tue Sep 30 20:09:53 GMT 2025