sbin/tunefs/tunefs.c

   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  * $DragonFly: src/sbin/tunefs/tunefs.c,v 1.7 2006/04/03 01:58:49 dillon Exp $
  33  */
  34
  35 /*
  36  * tunefs: change layout parameters to an existing file system.
  37  */
  38 #include <sys/param.h>
  39 #include <sys/mount.h>
  40 #include <sys/stat.h>
  41
  42 #include <vfs/ufs/dinode.h>
  43 #include <vfs/ufs/fs.h>
  44 #include <vfs/ufs/ufsmount.h>
  45
  46 #include <err.h>
  47 #include <fcntl.h>
  48 #include <fstab.h>
  49 #include <paths.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54
  55 /* the optimization warning string template */
  56 #define OPTWARN "should optimize for %s with minfree %s %d%%"
  57
  58 union {
  59         struct  fs sb;
  60         char pad[MAXBSIZE];
  61 } sbun;
  62 #define sblock sbun.sb
  63
  64 int fi;
  65 long dev_bsize = 1;
  66
  67 void bwrite(daddr_t, const char *, int);
  68 int bread(daddr_t, char *, int);
  69 void getsb(struct fs *, const char *);
  70 void putsb(struct fs *, const char *, int);
  71 void usage(void);
  72 void printfs(void);
  73
  74 int
  75 main(int argc, char **argv)
  76 {
  77         char *cp, *special;
  78         const char *name, *action;
  79         struct stat st;
  80         int i;
  81         int Aflag = 0, active = 0;
  82         struct fstab *fs;
  83         const char *chg[2];
  84         char device[MAXPATHLEN];
  85         struct ufs_args args;
  86         struct statfs stfs;
  87
  88         argc--, argv++;
  89         if (argc < 2)
  90                 usage();
  91         special = argv[argc - 1];
  92         fs = getfsfile(special);
  93         if (fs) {
  94                 if (statfs(special, &stfs) == 0 &&
  95                     strcmp(special, stfs.f_mntonname) == 0) {
  96                         active = 1;
  97                 }
  98                 special = fs->fs_spec;
  99         }
 100 again:
 101         if (stat(special, &st) < 0) {
 102                 if (*special != '/') {
 103                         if (*special == 'r')
 104                                 special++;
 105                         snprintf(device, sizeof(device), "%s%s",
 106                                  _PATH_DEV, special);
 107                         special = device;
 108                         goto again;
 109                 }
 110                 err(1, "%s", special);
 111         }
 112         if (fs == NULL && (st.st_mode & S_IFMT) == S_IFDIR)
 113                 errx(10, "%s: unknown file system", special);
 114         getsb(&sblock, special);
 115         for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) {
 116                 for (cp = &argv[0][1]; *cp; cp++)
 117                         switch (*cp) {
 118
 119                         case 'A':
 120                                 Aflag++;
 121                                 continue;
 122
 123                         case 'p':
 124                                 printfs();
 125                                 exit(0);
 126
 127                         case 'a':
 128                                 name = "maximum contiguous block count";
 129                                 if (argc < 1)
 130                                         errx(10, "-a: missing %s", name);
 131                                 argc--, argv++;
 132                                 i = atoi(*argv);
 133                                 if (i < 1)
 134                                         errx(10, "%s must be >= 1 (was %s)",
 135                                             name, *argv);
 136                                 warnx("%s changes from %d to %d",
 137                                     name, sblock.fs_maxcontig, i);
 138                                 sblock.fs_maxcontig = i;
 139                                 continue;
 140
 141                         case 'd':
 142                                 name =
 143                                    "rotational delay between contiguous blocks";
 144                                 if (argc < 1)
 145                                         errx(10, "-d: missing %s", name);
 146                                 argc--, argv++;
 147                                 i = atoi(*argv);
 148                                 warnx("%s changes from %dms to %dms",
 149                                     name, sblock.fs_rotdelay, i);
 150                                 sblock.fs_rotdelay = i;
 151                                 continue;
 152
 153                         case 'e':
 154                                 name =
 155                                   "maximum blocks per file in a cylinder group";
 156                                 if (argc < 1)
 157                                         errx(10, "-e: missing %s", name);
 158                                 argc--, argv++;
 159                                 i = atoi(*argv);
 160                                 if (i < 1)
 161                                         errx(10, "%s must be >= 1 (was %s)",
 162                                             name, *argv);
 163                                 warnx("%s changes from %d to %d",
 164                                     name, sblock.fs_maxbpg, i);
 165                                 sblock.fs_maxbpg = i;
 166                                 continue;
 167
 168                         case 'f':
 169                                 name = "average file size";
 170                                 if (argc < 1)
 171                                         errx(10, "-a: missing %s", name);
 172                                 argc--, argv++;
 173                                 i = atoi(*argv);
 174                                 if (i < 1)
 175                                         errx(10, "%s must be >= 1 (was %s)", name, *argv);
 176                                 if (sblock.fs_avgfilesize == i) {
 177                                         warnx("%s remains unchanged as %d",
 178                                                 name, i);
 179                                 } else {
 180                                         warnx("%s changes from %d to %d",
 181                                                 name, sblock.fs_avgfilesize, i);
 182                                         sblock.fs_avgfilesize = i;
 183                                 }
 184                                 break;
 185
 186                         case 'm':
 187                                 name = "minimum percentage of free space";
 188                                 if (argc < 1)
 189                                         errx(10, "-m: missing %s", name);
 190                                 argc--, argv++;
 191                                 i = atoi(*argv);
 192                                 if (i < 0 || i > 99)
 193                                         errx(10, "bad %s (%s)", name, *argv);
 194                                 warnx("%s changes from %d%% to %d%%",
 195                                     name, sblock.fs_minfree, i);
 196                                 sblock.fs_minfree = i;
 197                                 if (i >= MINFREE &&
 198                                     sblock.fs_optim == FS_OPTSPACE)
 199                                         warnx(OPTWARN, "time", ">=", MINFREE);
 200                                 if (i < MINFREE &&
 201                                     sblock.fs_optim == FS_OPTTIME)
 202                                         warnx(OPTWARN, "space", "<", MINFREE);
 203                                 continue;
 204
 205                         case 'n':
 206                                 name = "soft updates";
 207                                 if (argc < 1)
 208                                         errx(10, "-n: missing %s", name);
 209                                 argc--, argv++;
 210                                 if (strcmp(*argv, "enable") == 0) {
 211                                         sblock.fs_flags |= FS_DOSOFTDEP;
 212                                         action = "set";
 213                                 } else if (strcmp(*argv, "disable") == 0) {
 214                                         sblock.fs_flags &= ~FS_DOSOFTDEP;
 215                                         action = "cleared";
 216                                 } else {
 217                                         errx(10, "bad %s (options are %s)",
 218                                             name, "`enable' or `disable'");
 219                                 }
 220                                 warnx("%s %s", name, action);
 221                                 continue;
 222
 223                         case 'o':
 224                                 name = "optimization preference";
 225                                 if (argc < 1)
 226                                         errx(10, "-o: missing %s", name);
 227                                 argc--, argv++;
 228                                 chg[FS_OPTSPACE] = "space";
 229                                 chg[FS_OPTTIME] = "time";
 230                                 if (strcmp(*argv, chg[FS_OPTSPACE]) == 0)
 231                                         i = FS_OPTSPACE;
 232                                 else if (strcmp(*argv, chg[FS_OPTTIME]) == 0)
 233                                         i = FS_OPTTIME;
 234                                 else
 235                                         errx(10, "bad %s (options are `space' or `time')",
 236                                             name);
 237                                 if (sblock.fs_optim == i) {
 238                                         warnx("%s remains unchanged as %s",
 239                                             name, chg[i]);
 240                                         continue;
 241                                 }
 242                                 warnx("%s changes from %s to %s",
 243                                     name, chg[sblock.fs_optim], chg[i]);
 244                                 sblock.fs_optim = i;
 245                                 if (sblock.fs_minfree >= MINFREE &&
 246                                     i == FS_OPTSPACE)
 247                                         warnx(OPTWARN, "time", ">=", MINFREE);
 248                                 if (sblock.fs_minfree < MINFREE &&
 249                                     i == FS_OPTTIME)
 250                                         warnx(OPTWARN, "space", "<", MINFREE);
 251                                 continue;
 252
 253                         case 's':
 254                                 name = "expected number of files per directory";
 255                                 if (argc < 1)
 256                                         errx(10, "-a: missing %s", name);
 257                                 argc--, argv++;
 258                                 i = atoi(*argv);
 259                                 if (i < 1)
 260                                         errx(10, "%s must be >= 1 (was %s)", name, *argv);
 261                                 if (sblock.fs_avgfpdir == i) {
 262                                         warnx("%s remains unchanged as %d",
 263                                                 name, i);
 264                                 } else {
 265                                         warnx("%s changes from %d to %d",
 266                                                 name, sblock.fs_avgfpdir, i);
 267                                         sblock.fs_avgfpdir = i;
 268                                 }
 269                                 break;
 270
 271                         default:
 272                                 usage();
 273                         }
 274         }
 275         if (argc != 1)
 276                 usage();
 277         putsb(&sblock, special, Aflag);
 278         if (active) {
 279                 bzero(&args, sizeof(args));
 280                 if (mount("ufs", fs->fs_file,
 281                     stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0)
 282                         err(9, "%s: reload", special);
 283                 warnx("file system reloaded");
 284         }
 285         exit(0);
 286 }
 287
 288 void
 289 usage(void)
 290 {
 291         fprintf(stderr, "%s\n%s\n%s\n",
 292 "usage: tunefs [-Ap] [-a maxcontig] [-d rotdelay] [-e maxbpg] [-f avgfilesize]",
 293 "              [-m minfree] [-n enable | disable] [-o space | time]",
 294 "              [-s filesperdir] {special | filesystem}");
 295         exit(2);
 296 }
 297
 298 void
 299 getsb(struct fs *fs, const char *file)
 300 {
 301
 302         fi = open(file, O_RDONLY);
 303         if (fi < 0)
 304                 err(3, "cannot open %s", file);
 305         if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE))
 306                 err(4, "%s: bad super block", file);
 307         if (fs->fs_magic != FS_MAGIC)
 308                 errx(5, "%s: bad magic number", file);
 309         dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
 310 }
 311
 312 void
 313 putsb(struct fs *fs, const char *file, int all)
 314 {
 315         int i;
 316
 317         /*
 318          * Re-open the device read-write. Use the read-only file
 319          * descriptor as an interlock to prevent the device from
 320          * being mounted while we are switching mode.
 321          */
 322         i = fi;
 323         fi = open(file, O_RDWR);
 324         close(i);
 325         if (fi < 0)
 326                 err(3, "cannot open %s", file);
 327         bwrite((daddr_t)SBOFF / dev_bsize, (const char *)fs, SBSIZE);
 328         if (all)
 329                 for (i = 0; i < fs->fs_ncg; i++)
 330                         bwrite(fsbtodb(fs, cgsblock(fs, i)),
 331                             (const char *)fs, SBSIZE);
 332         close(fi);
 333 }
 334
 335 void
 336 printfs(void)
 337 {
 338         warnx("soft updates:  (-n)                                %s",
 339                 (sblock.fs_flags & FS_DOSOFTDEP)? "enabled" : "disabled");
 340         warnx("maximum contiguous block count: (-a)               %d",
 341               sblock.fs_maxcontig);
 342         warnx("rotational delay between contiguous blocks: (-d)   %d ms",
 343               sblock.fs_rotdelay);
 344         warnx("maximum blocks per file in a cylinder group: (-e)  %d",
 345               sblock.fs_maxbpg);
 346         warnx("average file size: (-f)                            %d",
 347               sblock.fs_avgfilesize);
 348         warnx("average number of files in a directory: (-s)       %d",
 349               sblock.fs_avgfpdir);
 350         warnx("minimum percentage of free space: (-m)             %d%%",
 351               sblock.fs_minfree);
 352         warnx("optimization preference: (-o)                      %s",
 353               sblock.fs_optim == FS_OPTSPACE ? "space" : "time");
 354         if (sblock.fs_minfree >= MINFREE &&
 355             sblock.fs_optim == FS_OPTSPACE)
 356                 warnx(OPTWARN, "time", ">=", MINFREE);
 357         if (sblock.fs_minfree < MINFREE &&
 358             sblock.fs_optim == FS_OPTTIME)
 359                 warnx(OPTWARN, "space", "<", MINFREE);
 360 }
 361
 362 void
 363 bwrite(daddr_t blk, const char *buf, int size)
 364 {
 365
 366         if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0)
 367                 err(6, "FS SEEK");
 368         if (write(fi, buf, size) != size)
 369                 err(7, "FS WRITE");
 370 }
 371
 372 int
 373 bread(daddr_t bno, char *buf, int cnt)
 374 {
 375         int i;
 376
 377         if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0)
 378                 return(1);
 379         if ((i = read(fi, buf, cnt)) != cnt) {
 380                 for(i=0; i<sblock.fs_bsize; i++)
 381                         buf[i] = 0;
 382                 return (1);
 383         }
 384         return (0);
 385 }