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. 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  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)tunefs.c 8.2 (Berkeley) 4/19/94
  35  * $FreeBSD: src/sbin/tunefs/tunefs.c,v 1.11.2.5 2001/10/14 21:50:39 iedowse Exp $
  36  * $DragonFly: src/sbin/tunefs/tunefs.c,v 1.7 2006/04/03 01:58:49 dillon Exp $
  37  */
  38
  39 /*
  40  * tunefs: change layout parameters to an existing file system.
  41  */
  42 #include <sys/param.h>
  43 #include <sys/mount.h>
  44 #include <sys/stat.h>
  45
  46 #include <vfs/ufs/dinode.h>
  47 #include <vfs/ufs/fs.h>
  48 #include <vfs/ufs/ufsmount.h>
  49
  50 #include <err.h>
  51 #include <fcntl.h>
  52 #include <fstab.h>
  53 #include <paths.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58
  59 /* the optimization warning string template */
  60 #define OPTWARN "should optimize for %s with minfree %s %d%%"
  61
  62 union {
  63         struct  fs sb;
  64         char pad[MAXBSIZE];
  65 } sbun;
  66 #define sblock sbun.sb
  67
  68 int fi;
  69 long dev_bsize = 1;
  70
  71 void bwrite(daddr_t, const char *, int);
  72 int bread(daddr_t, char *, int);
  73 void getsb(struct fs *, const char *);
  74 void putsb(struct fs *, const char *, int);
  75 void usage(void);
  76 void printfs(void);
  77
  78 int
  79 main(int argc, char **argv)
  80 {
  81         char *cp, *special;
  82         const char *name, *action;
  83         struct stat st;
  84         int i;
  85         int Aflag = 0, active = 0;
  86         struct fstab *fs;
  87         const char *chg[2];
  88         char device[MAXPATHLEN];
  89         struct ufs_args args;
  90         struct statfs stfs;
  91
  92         argc--, argv++;
  93         if (argc < 2)
  94                 usage();
  95         special = argv[argc - 1];
  96         fs = getfsfile(special);
  97         if (fs) {
  98                 if (statfs(special, &stfs) == 0 &&
  99                     strcmp(special, stfs.f_mntonname) == 0) {
 100                         active = 1;
 101                 }
 102                 special = fs->fs_spec;
 103         }
 104 again:
 105         if (stat(special, &st) < 0) {
 106                 if (*special != '/') {
 107                         if (*special == 'r')
 108                                 special++;
 109                         snprintf(device, sizeof(device), "%s%s",
 110                                  _PATH_DEV, special);
 111                         special = device;
 112                         goto again;
 113                 }
 114                 err(1, "%s", special);
 115         }
 116         if (fs == NULL && (st.st_mode & S_IFMT) == S_IFDIR)
 117                 errx(10, "%s: unknown file system", special);
 118         getsb(&sblock, special);
 119         for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) {
 120                 for (cp = &argv[0][1]; *cp; cp++)
 121                         switch (*cp) {
 122
 123                         case 'A':
 124                                 Aflag++;
 125                                 continue;
 126
 127                         case 'p':
 128                                 printfs();
 129                                 exit(0);
 130
 131                         case 'a':
 132                                 name = "maximum contiguous block count";
 133                                 if (argc < 1)
 134                                         errx(10, "-a: missing %s", name);
 135                                 argc--, argv++;
 136                                 i = atoi(*argv);
 137                                 if (i < 1)
 138                                         errx(10, "%s must be >= 1 (was %s)",
 139                                             name, *argv);
 140                                 warnx("%s changes from %d to %d",
 141                                     name, sblock.fs_maxcontig, i);
 142                                 sblock.fs_maxcontig = i;
 143                                 continue;
 144
 145                         case 'd':
 146                                 name =
 147                                    "rotational delay between contiguous blocks";
 148                                 if (argc < 1)
 149                                         errx(10, "-d: missing %s", name);
 150                                 argc--, argv++;
 151                                 i = atoi(*argv);
 152                                 warnx("%s changes from %dms to %dms",
 153                                     name, sblock.fs_rotdelay, i);
 154                                 sblock.fs_rotdelay = i;
 155                                 continue;
 156
 157                         case 'e':
 158                                 name =
 159                                   "maximum blocks per file in a cylinder group";
 160                                 if (argc < 1)
 161                                         errx(10, "-e: missing %s", name);
 162                                 argc--, argv++;
 163                                 i = atoi(*argv);
 164                                 if (i < 1)
 165                                         errx(10, "%s must be >= 1 (was %s)",
 166                                             name, *argv);
 167                                 warnx("%s changes from %d to %d",
 168                                     name, sblock.fs_maxbpg, i);
 169                                 sblock.fs_maxbpg = i;
 170                                 continue;
 171
 172                         case 'f':
 173                                 name = "average file size";
 174                                 if (argc < 1)
 175                                         errx(10, "-a: missing %s", name);
 176                                 argc--, argv++;
 177                                 i = atoi(*argv);
 178                                 if (i < 1)
 179                                         errx(10, "%s must be >= 1 (was %s)", name, *argv);
 180                                 if (sblock.fs_avgfilesize == i) {
 181                                         warnx("%s remains unchanged as %d",
 182                                                 name, i);
 183                                 } else {
 184                                         warnx("%s changes from %d to %d",
 185                                                 name, sblock.fs_avgfilesize, i);
 186                                         sblock.fs_avgfilesize = i;
 187                                 }
 188                                 break;
 189
 190                         case 'm':
 191                                 name = "minimum percentage of free space";
 192                                 if (argc < 1)
 193                                         errx(10, "-m: missing %s", name);
 194                                 argc--, argv++;
 195                                 i = atoi(*argv);
 196                                 if (i < 0 || i > 99)
 197                                         errx(10, "bad %s (%s)", name, *argv);
 198                                 warnx("%s changes from %d%% to %d%%",
 199                                     name, sblock.fs_minfree, i);
 200                                 sblock.fs_minfree = i;
 201                                 if (i >= MINFREE &&
 202                                     sblock.fs_optim == FS_OPTSPACE)
 203                                         warnx(OPTWARN, "time", ">=", MINFREE);
 204                                 if (i < MINFREE &&
 205                                     sblock.fs_optim == FS_OPTTIME)
 206                                         warnx(OPTWARN, "space", "<", MINFREE);
 207                                 continue;
 208
 209                         case 'n':
 210                                 name = "soft updates";
 211                                 if (argc < 1)
 212                                         errx(10, "-n: missing %s", name);
 213                                 argc--, argv++;
 214                                 if (strcmp(*argv, "enable") == 0) {
 215                                         sblock.fs_flags |= FS_DOSOFTDEP;
 216                                         action = "set";
 217                                 } else if (strcmp(*argv, "disable") == 0) {
 218                                         sblock.fs_flags &= ~FS_DOSOFTDEP;
 219                                         action = "cleared";
 220                                 } else {
 221                                         errx(10, "bad %s (options are %s)",
 222                                             name, "`enable' or `disable'");
 223                                 }
 224                                 warnx("%s %s", name, action);
 225                                 continue;
 226
 227                         case 'o':
 228                                 name = "optimization preference";
 229                                 if (argc < 1)
 230                                         errx(10, "-o: missing %s", name);
 231                                 argc--, argv++;
 232                                 chg[FS_OPTSPACE] = "space";
 233                                 chg[FS_OPTTIME] = "time";
 234                                 if (strcmp(*argv, chg[FS_OPTSPACE]) == 0)
 235                                         i = FS_OPTSPACE;
 236                                 else if (strcmp(*argv, chg[FS_OPTTIME]) == 0)
 237                                         i = FS_OPTTIME;
 238                                 else
 239                                         errx(10, "bad %s (options are `space' or `time')",
 240                                             name);
 241                                 if (sblock.fs_optim == i) {
 242                                         warnx("%s remains unchanged as %s",
 243                                             name, chg[i]);
 244                                         continue;
 245                                 }
 246                                 warnx("%s changes from %s to %s",
 247                                     name, chg[sblock.fs_optim], chg[i]);
 248                                 sblock.fs_optim = i;
 249                                 if (sblock.fs_minfree >= MINFREE &&
 250                                     i == FS_OPTSPACE)
 251                                         warnx(OPTWARN, "time", ">=", MINFREE);
 252                                 if (sblock.fs_minfree < MINFREE &&
 253                                     i == FS_OPTTIME)
 254                                         warnx(OPTWARN, "space", "<", MINFREE);
 255                                 continue;
 256
 257                         case 's':
 258                                 name = "expected number of files per directory";
 259                                 if (argc < 1)
 260                                         errx(10, "-a: missing %s", name);
 261                                 argc--, argv++;
 262                                 i = atoi(*argv);
 263                                 if (i < 1)
 264                                         errx(10, "%s must be >= 1 (was %s)", name, *argv);
 265                                 if (sblock.fs_avgfpdir == i) {
 266                                         warnx("%s remains unchanged as %d",
 267                                                 name, i);
 268                                 } else {
 269                                         warnx("%s changes from %d to %d",
 270                                                 name, sblock.fs_avgfpdir, i);
 271                                         sblock.fs_avgfpdir = i;
 272                                 }
 273                                 break;
 274
 275                         default:
 276                                 usage();
 277                         }
 278         }
 279         if (argc != 1)
 280                 usage();
 281         putsb(&sblock, special, Aflag);
 282         if (active) {
 283                 bzero(&args, sizeof(args));
 284                 if (mount("ufs", fs->fs_file,
 285                     stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0)
 286                         err(9, "%s: reload", special);
 287                 warnx("file system reloaded");
 288         }
 289         exit(0);
 290 }
 291
 292 void
 293 usage(void)
 294 {
 295         fprintf(stderr, "%s\n%s\n%s\n",
 296 "usage: tunefs [-A] [-a maxcontig] [-d rotdelay] [-e maxbpg] [-f avgfilesize]",
 297 "              [-m minfree] [-p] [-n enable | disable] [-o space | time]",
 298 "              [-s filesperdir] [special | filesystem]");
 299         exit(2);
 300 }
 301
 302 void
 303 getsb(struct fs *fs, const char *file)
 304 {
 305
 306         fi = open(file, O_RDONLY);
 307         if (fi < 0)
 308                 err(3, "cannot open %s", file);
 309         if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE))
 310                 err(4, "%s: bad super block", file);
 311         if (fs->fs_magic != FS_MAGIC)
 312                 errx(5, "%s: bad magic number", file);
 313         dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
 314 }
 315
 316 void
 317 putsb(struct fs *fs, const char *file, int all)
 318 {
 319         int i;
 320
 321         /*
 322          * Re-open the device read-write. Use the read-only file
 323          * descriptor as an interlock to prevent the device from
 324          * being mounted while we are switching mode.
 325          */
 326         i = fi;
 327         fi = open(file, O_RDWR);
 328         close(i);
 329         if (fi < 0)
 330                 err(3, "cannot open %s", file);
 331         bwrite((daddr_t)SBOFF / dev_bsize, (const char *)fs, SBSIZE);
 332         if (all)
 333                 for (i = 0; i < fs->fs_ncg; i++)
 334                         bwrite(fsbtodb(fs, cgsblock(fs, i)),
 335                             (const char *)fs, SBSIZE);
 336         close(fi);
 337 }
 338
 339 void
 340 printfs(void)
 341 {
 342         warnx("soft updates:  (-n)                                %s",
 343                 (sblock.fs_flags & FS_DOSOFTDEP)? "enabled" : "disabled");
 344         warnx("maximum contiguous block count: (-a)               %d",
 345               sblock.fs_maxcontig);
 346         warnx("rotational delay between contiguous blocks: (-d)   %d ms",
 347               sblock.fs_rotdelay);
 348         warnx("maximum blocks per file in a cylinder group: (-e)  %d",
 349               sblock.fs_maxbpg);
 350         warnx("average file size: (-f)                            %d",
 351               sblock.fs_avgfilesize);
 352         warnx("average number of files in a directory: (-s)       %d",
 353               sblock.fs_avgfpdir);
 354         warnx("minimum percentage of free space: (-m)             %d%%",
 355               sblock.fs_minfree);
 356         warnx("optimization preference: (-o)                      %s",
 357               sblock.fs_optim == FS_OPTSPACE ? "space" : "time");
 358         if (sblock.fs_minfree >= MINFREE &&
 359             sblock.fs_optim == FS_OPTSPACE)
 360                 warnx(OPTWARN, "time", ">=", MINFREE);
 361         if (sblock.fs_minfree < MINFREE &&
 362             sblock.fs_optim == FS_OPTTIME)
 363                 warnx(OPTWARN, "space", "<", MINFREE);
 364 }
 365
 366 void
 367 bwrite(daddr_t blk, const char *buf, int size)
 368 {
 369
 370         if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0)
 371                 err(6, "FS SEEK");
 372         if (write(fi, buf, size) != size)
 373                 err(7, "FS WRITE");
 374 }
 375
 376 int
 377 bread(daddr_t bno, char *buf, int cnt)
 378 {
 379         int i;
 380
 381         if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0)
 382                 return(1);
 383         if ((i = read(fi, buf, cnt)) != cnt) {
 384                 for(i=0; i<sblock.fs_bsize; i++)
 385                         buf[i] = 0;
 386                 return (1);
 387         }
 388         return (0);
 389 }