tunefs.c revision 42873
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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char copyright[] = 36"@(#) Copyright (c) 1983, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38#endif /* not lint */ 39 40#ifndef lint 41#if 0 42static char sccsid[] = "@(#)tunefs.c 8.2 (Berkeley) 4/19/94"; 43#endif 44static const char rcsid[] = 45 "$Id: tunefs.c,v 1.6 1998/08/03 06:41:20 charnier Exp $"; 46#endif /* not lint */ 47 48/* 49 * tunefs: change layout parameters to an existing file system. 50 */ 51#include <sys/param.h> 52#include <sys/mount.h> 53#include <sys/stat.h> 54 55#include <ufs/ffs/fs.h> 56#include <ufs/ufs/ufsmount.h> 57 58#include <err.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 67/* the optimization warning string template */ 68#define OPTWARN "should optimize for %s with minfree %s %d%%" 69 70union { 71 struct fs sb; 72 char pad[MAXBSIZE]; 73} sbun; 74#define sblock sbun.sb 75 76int fi; 77long dev_bsize = 1; 78 79void bwrite(daddr_t, char *, int); 80int bread(daddr_t, char *, int); 81void getsb(struct fs *, char *); 82void usage __P((void)); 83void printfs __P((void)); 84char *rawname __P((char *, char *)); 85 86int 87main(argc, argv) 88 int argc; 89 char *argv[]; 90{ 91 char *cp, *special, *name, *action; 92 struct stat st; 93 int i; 94 int Aflag = 0, active = 0; 95 struct fstab *fs; 96 char *chg[2], device[MAXPATHLEN]; 97 struct ufs_args args; 98 struct statfs stfs; 99 100 argc--, argv++; 101 if (argc < 2) 102 usage(); 103 special = argv[argc - 1]; 104 fs = getfsfile(special); 105 if (fs) { 106 if (statfs(special, &stfs) == 0) { 107 if ((stfs.f_flags & MNT_RDONLY) == 0) { 108 errx(1, "cannot work on read-write mounted file system"); 109 } 110 active = 1; 111 special = rawname(fs->fs_spec, device); 112 } else 113 special = fs->fs_spec; 114 } 115again: 116 if (stat(special, &st) < 0) { 117 if (*special != '/') { 118 if (*special == 'r') 119 special++; 120 (void)sprintf(device, "%s/%s", _PATH_DEV, special); 121 special = device; 122 goto again; 123 } 124 err(1, "%s", special); 125 } 126 if ((st.st_mode & S_IFMT) != S_IFBLK && 127 (st.st_mode & S_IFMT) != S_IFCHR) 128 errx(10, "%s: not a block or character device", special); 129 getsb(&sblock, special); 130 for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) { 131 for (cp = &argv[0][1]; *cp; cp++) 132 switch (*cp) { 133 134 case 'A': 135 Aflag++; 136 continue; 137 138 case 'p': 139 printfs(); 140 exit(0); 141 142 case 'a': 143 name = "maximum contiguous block count"; 144 if (argc < 1) 145 errx(10, "-a: missing %s", name); 146 argc--, argv++; 147 i = atoi(*argv); 148 if (i < 1) 149 errx(10, "%s must be >= 1 (was %s)", 150 name, *argv); 151 warnx("%s changes from %d to %d", 152 name, sblock.fs_maxcontig, i); 153 sblock.fs_maxcontig = i; 154 continue; 155 156 case 'd': 157 name = 158 "rotational delay between contiguous blocks"; 159 if (argc < 1) 160 errx(10, "-d: missing %s", name); 161 argc--, argv++; 162 i = atoi(*argv); 163 warnx("%s changes from %dms to %dms", 164 name, sblock.fs_rotdelay, i); 165 sblock.fs_rotdelay = i; 166 continue; 167 168 case 'e': 169 name = 170 "maximum blocks per file in a cylinder group"; 171 if (argc < 1) 172 errx(10, "-e: missing %s", name); 173 argc--, argv++; 174 i = atoi(*argv); 175 if (i < 1) 176 errx(10, "%s must be >= 1 (was %s)", 177 name, *argv); 178 warnx("%s changes from %d to %d", 179 name, sblock.fs_maxbpg, i); 180 sblock.fs_maxbpg = i; 181 continue; 182 183 case 'm': 184 name = "minimum percentage of free space"; 185 if (argc < 1) 186 errx(10, "-m: missing %s", name); 187 argc--, argv++; 188 i = atoi(*argv); 189 if (i < 0 || i > 99) 190 errx(10, "bad %s (%s)", name, *argv); 191 warnx("%s changes from %d%% to %d%%", 192 name, sblock.fs_minfree, i); 193 sblock.fs_minfree = i; 194 if (i >= MINFREE && 195 sblock.fs_optim == FS_OPTSPACE) 196 warnx(OPTWARN, "time", ">=", MINFREE); 197 if (i < MINFREE && 198 sblock.fs_optim == FS_OPTTIME) 199 warnx(OPTWARN, "space", "<", MINFREE); 200 continue; 201 202 case 'n': 203 name = "soft updates"; 204 if (argc < 1) 205 errx(10, "-s: missing %s", name); 206 argc--, argv++; 207 if (strcmp(*argv, "enable") == 0) { 208 sblock.fs_flags |= FS_DOSOFTDEP; 209 action = "set"; 210 } else if (strcmp(*argv, "disable") == 0) { 211 sblock.fs_flags &= ~FS_DOSOFTDEP; 212 action = "cleared"; 213 } else { 214 errx(10, "bad %s (options are %s)", 215 name, "`enable' or `disable'"); 216 } 217 warnx("%s %s", name, action); 218 continue; 219 220 case 'o': 221 name = "optimization preference"; 222 if (argc < 1) 223 errx(10, "-o: missing %s", name); 224 argc--, argv++; 225 chg[FS_OPTSPACE] = "space"; 226 chg[FS_OPTTIME] = "time"; 227 if (strcmp(*argv, chg[FS_OPTSPACE]) == 0) 228 i = FS_OPTSPACE; 229 else if (strcmp(*argv, chg[FS_OPTTIME]) == 0) 230 i = FS_OPTTIME; 231 else 232 errx(10, "bad %s (options are `space' or `time')", 233 name); 234 if (sblock.fs_optim == i) { 235 warnx("%s remains unchanged as %s", 236 name, chg[i]); 237 continue; 238 } 239 warnx("%s changes from %s to %s", 240 name, chg[sblock.fs_optim], chg[i]); 241 sblock.fs_optim = i; 242 if (sblock.fs_minfree >= MINFREE && 243 i == FS_OPTSPACE) 244 warnx(OPTWARN, "time", ">=", MINFREE); 245 if (sblock.fs_minfree < MINFREE && 246 i == FS_OPTTIME) 247 warnx(OPTWARN, "space", "<", MINFREE); 248 continue; 249 250 default: 251 usage(); 252 } 253 } 254 if (argc != 1) 255 usage(); 256 bwrite((daddr_t)SBOFF / dev_bsize, (char *)&sblock, SBSIZE); 257 if (Aflag) 258 for (i = 0; i < sblock.fs_ncg; i++) 259 bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)), 260 (char *)&sblock, SBSIZE); 261 close(fi); 262 if (active) { 263 bzero(&args, sizeof(args)); 264 if (mount("ufs", fs->fs_file, 265 stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0) 266 err(9, "%s: reload", special); 267 warnx("file system reloaded"); 268 } 269 exit(0); 270} 271 272void 273usage() 274{ 275 fprintf(stderr, "%s\n%s\n%s\n", 276"usage: tunefs [-A] [-a maxcontig] [-d rotdelay] [-e maxbpg] [-m minfree]", 277" [-p] [-n enable | disable] [-o optimize_preference]", 278" [special | filesystem]"); 279 exit(2); 280} 281 282void 283getsb(fs, file) 284 register struct fs *fs; 285 char *file; 286{ 287 288 fi = open(file, 2); 289 if (fi < 0) 290 err(3, "cannot open %s", file); 291 if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE)) 292 err(4, "%s: bad super block", file); 293 if (fs->fs_magic != FS_MAGIC) 294 err(5, "%s: bad magic number", file); 295 dev_bsize = fs->fs_fsize / fsbtodb(fs, 1); 296} 297 298void 299printfs() 300{ 301 warnx("soft updates: (-n) %s", 302 (sblock.fs_flags & FS_DOSOFTDEP)? "enabled" : "disabled"); 303 warnx("maximum contiguous block count: (-a) %d", 304 sblock.fs_maxcontig); 305 warnx("rotational delay between contiguous blocks: (-d) %d ms", 306 sblock.fs_rotdelay); 307 warnx("maximum blocks per file in a cylinder group: (-e) %d", 308 sblock.fs_maxbpg); 309 warnx("minimum percentage of free space: (-m) %d%%", 310 sblock.fs_minfree); 311 warnx("optimization preference: (-o) %s", 312 sblock.fs_optim == FS_OPTSPACE ? "space" : "time"); 313 if (sblock.fs_minfree >= MINFREE && 314 sblock.fs_optim == FS_OPTSPACE) 315 warnx(OPTWARN, "time", ">=", MINFREE); 316 if (sblock.fs_minfree < MINFREE && 317 sblock.fs_optim == FS_OPTTIME) 318 warnx(OPTWARN, "space", "<", MINFREE); 319} 320 321void 322bwrite(blk, buf, size) 323 daddr_t blk; 324 char *buf; 325 int size; 326{ 327 328 if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0) 329 err(6, "FS SEEK"); 330 if (write(fi, buf, size) != size) 331 err(7, "FS WRITE"); 332} 333 334int 335bread(bno, buf, cnt) 336 daddr_t bno; 337 char *buf; 338 int cnt; 339{ 340 int i; 341 342 if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0) 343 return(1); 344 if ((i = read(fi, buf, cnt)) != cnt) { 345 for(i=0; i<sblock.fs_bsize; i++) 346 buf[i] = 0; 347 return (1); 348 } 349 return (0); 350} 351 352char * 353rawname(special, pathbuf) 354 char *special; 355 char *pathbuf; 356{ 357 char *p; 358 int n; 359 360 p = strrchr(special, '/'); 361 if (p) { 362 n = ++p - special; 363 bcopy(special, pathbuf, n); 364 } else { 365 strcpy(pathbuf, _PATH_DEV); 366 n = strlen(pathbuf); 367 p = special; 368 } 369 pathbuf[n++] = 'r'; 370 strcpy(pathbuf + n, p); 371 return pathbuf; 372} 373