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  */
  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 }