1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1983, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)tunefs.c 8.2 (Berkeley) 4/19/94 31 * $FreeBSD: src/sbin/tunefs/tunefs.c,v 1.11.2.5 2001/10/14 21:50:39 iedowse Exp $ 32 */ 33 34 /* 35 * tunefs: change layout parameters to an existing file system. 36 */ 37 #include <sys/param.h> 38 #include <sys/mount.h> 39 #include <sys/stat.h> 40 41 #include <vfs/ufs/dinode.h> 42 #include <vfs/ufs/fs.h> 43 #include <vfs/ufs/ufsmount.h> 44 45 #include <err.h> 46 #include <fcntl.h> 47 #include <fstab.h> 48 #include <paths.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <unistd.h> 53 54 /* the optimization warning string template */ 55 #define OPTWARN "should optimize for %s with minfree %s %d%%" 56 57 union { 58 struct fs sb; 59 char pad[MAXBSIZE]; 60 } sbun; 61 #define sblock sbun.sb 62 63 int fi; 64 long dev_bsize = 1; 65 66 void bwrite(daddr_t, const char *, int); 67 int bread(daddr_t, char *, int); 68 void getsb(struct fs *, const char *); 69 void putsb(struct fs *, const char *, int); 70 void usage(void) __dead2; 71 void printfs(void); 72 73 int 74 main(int argc, char **argv) 75 { 76 char *cp, *special; 77 const char *name, *action; 78 struct stat st; 79 int i; 80 int Aflag = 0, active = 0; 81 struct fstab *fs; 82 const char *chg[2]; 83 char device[MAXPATHLEN]; 84 struct ufs_args args; 85 struct statfs stfs; 86 87 argc--, argv++; 88 if (argc < 2) 89 usage(); 90 special = argv[argc - 1]; 91 fs = getfsfile(special); 92 if (fs) { 93 if (statfs(special, &stfs) == 0 && 94 strcmp(special, stfs.f_mntonname) == 0) { 95 active = 1; 96 } 97 special = fs->fs_spec; 98 } 99 again: 100 if (stat(special, &st) < 0) { 101 if (*special != '/') { 102 if (*special == 'r') 103 special++; 104 snprintf(device, sizeof(device), "%s%s", 105 _PATH_DEV, special); 106 special = device; 107 goto again; 108 } 109 err(1, "%s", special); 110 } 111 if (fs == NULL && (st.st_mode & S_IFMT) == S_IFDIR) 112 errx(10, "%s: unknown file system", special); 113 getsb(&sblock, special); 114 for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) { 115 for (cp = &argv[0][1]; *cp; cp++) 116 switch (*cp) { 117 118 case 'A': 119 Aflag++; 120 continue; 121 122 case 'p': 123 printfs(); 124 exit(0); 125 126 case 'a': 127 name = "maximum contiguous block count"; 128 if (argc < 1) 129 errx(10, "-a: missing %s", name); 130 argc--, argv++; 131 i = atoi(*argv); 132 if (i < 1) 133 errx(10, "%s must be >= 1 (was %s)", 134 name, *argv); 135 warnx("%s changes from %d to %d", 136 name, sblock.fs_maxcontig, i); 137 sblock.fs_maxcontig = i; 138 continue; 139 140 case 'd': 141 name = 142 "rotational delay between contiguous blocks"; 143 if (argc < 1) 144 errx(10, "-d: missing %s", name); 145 argc--, argv++; 146 i = atoi(*argv); 147 warnx("%s changes from %dms to %dms", 148 name, sblock.fs_rotdelay, i); 149 sblock.fs_rotdelay = i; 150 continue; 151 152 case 'e': 153 name = 154 "maximum blocks per file in a cylinder group"; 155 if (argc < 1) 156 errx(10, "-e: missing %s", name); 157 argc--, argv++; 158 i = atoi(*argv); 159 if (i < 1) 160 errx(10, "%s must be >= 1 (was %s)", 161 name, *argv); 162 warnx("%s changes from %d to %d", 163 name, sblock.fs_maxbpg, i); 164 sblock.fs_maxbpg = i; 165 continue; 166 167 case 'f': 168 name = "average file size"; 169 if (argc < 1) 170 errx(10, "-a: missing %s", name); 171 argc--, argv++; 172 i = atoi(*argv); 173 if (i < 1) 174 errx(10, "%s must be >= 1 (was %s)", name, *argv); 175 if (sblock.fs_avgfilesize == i) { 176 warnx("%s remains unchanged as %d", 177 name, i); 178 } else { 179 warnx("%s changes from %d to %d", 180 name, sblock.fs_avgfilesize, i); 181 sblock.fs_avgfilesize = i; 182 } 183 break; 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; 203 204 case 'n': 205 name = "soft updates"; 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; 221 222 case 'o': 223 name = "optimization preference"; 224 if (argc < 1) 225 errx(10, "-o: missing %s", name); 226 argc--, argv++; 227 chg[FS_OPTSPACE] = "space"; 228 chg[FS_OPTTIME] = "time"; 229 if (strcmp(*argv, chg[FS_OPTSPACE]) == 0) 230 i = FS_OPTSPACE; 231 else if (strcmp(*argv, chg[FS_OPTTIME]) == 0) 232 i = FS_OPTTIME; 233 else 234 errx(10, "bad %s (options are `space' or `time')", 235 name); 236 if (sblock.fs_optim == i) { 237 warnx("%s remains unchanged as %s", 238 name, chg[i]); 239 continue; 240 } 241 warnx("%s changes from %s to %s", 242 name, chg[sblock.fs_optim], chg[i]); 243 sblock.fs_optim = i; 244 if (sblock.fs_minfree >= MINFREE && 245 i == FS_OPTSPACE) 246 warnx(OPTWARN, "time", ">=", MINFREE); 247 if (sblock.fs_minfree < MINFREE && 248 i == FS_OPTTIME) 249 warnx(OPTWARN, "space", "<", MINFREE); 250 continue; 251 252 case 's': 253 name = "expected number of files per directory"; 254 if (argc < 1) 255 errx(10, "-a: missing %s", name); 256 argc--, argv++; 257 i = atoi(*argv); 258 if (i < 1) 259 errx(10, "%s must be >= 1 (was %s)", name, *argv); 260 if (sblock.fs_avgfpdir == i) { 261 warnx("%s remains unchanged as %d", 262 name, i); 263 } else { 264 warnx("%s changes from %d to %d", 265 name, sblock.fs_avgfpdir, i); 266 sblock.fs_avgfpdir = i; 267 } 268 break; 269 270 default: 271 usage(); 272 } 273 } 274 if (argc != 1) 275 usage(); 276 putsb(&sblock, special, Aflag); 277 if (active) { 278 bzero(&args, sizeof(args)); 279 if (mount("ufs", fs->fs_file, 280 stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0) 281 err(9, "%s: reload", special); 282 warnx("file system reloaded"); 283 } 284 exit(0); 285 } 286 287 void 288 usage(void) 289 { 290 fprintf(stderr, "%s\n%s\n%s\n", 291 "usage: tunefs [-Ap] [-a maxcontig] [-d rotdelay] [-e maxbpg] [-f avgfilesize]", 292 " [-m minfree] [-n enable | disable] [-o space | time]", 293 " [-s filesperdir] {special | filesystem}"); 294 exit(2); 295 } 296 297 void 298 getsb(struct fs *fs, const char *file) 299 { 300 301 fi = open(file, O_RDONLY); 302 if (fi < 0) 303 err(3, "cannot open %s", file); 304 if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE)) 305 err(4, "%s: bad super block", file); 306 if (fs->fs_magic != FS_MAGIC) 307 errx(5, "%s: bad magic number", file); 308 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 309 } 310 311 void 312 putsb(struct fs *fs, const char *file, int all) 313 { 314 int i; 315 316 /* 317 * Re-open the device read-write. Use the read-only file 318 * descriptor as an interlock to prevent the device from 319 * being mounted while we are switching mode. 320 */ 321 i = fi; 322 fi = open(file, O_RDWR); 323 close(i); 324 if (fi < 0) 325 err(3, "cannot open %s", file); 326 bwrite((daddr_t)SBOFF / dev_bsize, (const char *)fs, SBSIZE); 327 if (all) 328 for (i = 0; i < fs->fs_ncg; i++) 329 bwrite(fsbtodb(fs, cgsblock(fs, i)), 330 (const char *)fs, SBSIZE); 331 close(fi); 332 } 333 334 void 335 printfs(void) 336 { 337 warnx("soft updates: (-n) %s", 338 (sblock.fs_flags & FS_DOSOFTDEP)? "enabled" : "disabled"); 339 warnx("maximum contiguous block count: (-a) %d", 340 sblock.fs_maxcontig); 341 warnx("rotational delay between contiguous blocks: (-d) %d ms", 342 sblock.fs_rotdelay); 343 warnx("maximum blocks per file in a cylinder group: (-e) %d", 344 sblock.fs_maxbpg); 345 warnx("average file size: (-f) %d", 346 sblock.fs_avgfilesize); 347 warnx("average number of files in a directory: (-s) %d", 348 sblock.fs_avgfpdir); 349 warnx("minimum percentage of free space: (-m) %d%%", 350 sblock.fs_minfree); 351 warnx("optimization preference: (-o) %s", 352 sblock.fs_optim == FS_OPTSPACE ? "space" : "time"); 353 if (sblock.fs_minfree >= MINFREE && 354 sblock.fs_optim == FS_OPTSPACE) 355 warnx(OPTWARN, "time", ">=", MINFREE); 356 if (sblock.fs_minfree < MINFREE && 357 sblock.fs_optim == FS_OPTTIME) 358 warnx(OPTWARN, "space", "<", MINFREE); 359 } 360 361 void 362 bwrite(daddr_t blk, const char *buf, int size) 363 { 364 365 if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0) 366 err(6, "FS SEEK"); 367 if (write(fi, buf, size) != size) 368 err(7, "FS WRITE"); 369 } 370 371 int 372 bread(daddr_t bno, char *buf, int cnt) 373 { 374 int i; 375 376 if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0) 377 return(1); 378 if ((i = read(fi, buf, cnt)) != cnt) { 379 for(i=0; i<sblock.fs_bsize; i++) 380 buf[i] = 0; 381 return (1); 382 } 383 return (0); 384 } 385