334 lines
8.6 KiB
C
334 lines
8.6 KiB
C
/* $OpenBSD: tunefs.c,v 1.41 2016/05/28 23:44:27 tb Exp $ */
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/* $NetBSD: tunefs.c,v 1.33 2005/01/19 20:46:16 xtraeme Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* tunefs: change layout parameters to an existing file system.
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*/
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#include <sys/param.h> /* DEV_BSIZE MAXBSIZE */
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#include <ufs/ufs/dinode.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fstab.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <limits.h>
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#include <util.h>
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/* the optimization warning string template */
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#define OPTWARN "should optimize for %s with minfree %s %d%%"
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union {
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struct fs sb;
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char pad[MAXBSIZE];
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} sbun;
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#define sblock sbun.sb
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char buf[MAXBSIZE];
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int fi;
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int is_ufs2 = 0;
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off_t sblockloc;
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static off_t sblock_try[] = SBLOCKSEARCH;
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static void bwrite(daddr_t, char *, int, const char *);
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static void bread(daddr_t, char *, int, const char *);
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static int getnum(const char *, const char *, int, int);
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static void getsb(struct fs *, const char *);
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static int openpartition(char *, int, char **);
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static void usage(void);
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int
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main(int argc, char *argv[])
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{
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#define OPTSTRING "AFNe:g:h:m:o:"
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int i, ch, Aflag, Fflag, Nflag, openflags;
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char *special;
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const char *chg[2];
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int maxbpg, minfree, optim;
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int avgfilesize, avgfpdir;
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Aflag = Fflag = Nflag = 0;
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maxbpg = minfree = optim = -1;
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avgfilesize = avgfpdir = -1;
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chg[FS_OPTSPACE] = "space";
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chg[FS_OPTTIME] = "time";
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while ((ch = getopt(argc, argv, OPTSTRING)) != -1) {
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switch (ch) {
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case 'A':
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Aflag = 1;
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break;
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case 'F':
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Fflag = 1;
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break;
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case 'N':
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Nflag = 1;
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break;
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case 'e':
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maxbpg = getnum(optarg,
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"maximum blocks per file in a cylinder group",
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1, INT_MAX);
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break;
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case 'g':
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avgfilesize = getnum(optarg,
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"average file size", 1, INT_MAX);
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break;
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case 'h':
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avgfpdir = getnum(optarg,
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"expected number of files per directory",
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1, INT_MAX);
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break;
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case 'm':
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minfree = getnum(optarg,
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"minimum percentage of free space", 0, 99);
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break;
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case 'o':
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if (strcmp(optarg, chg[FS_OPTSPACE]) == 0)
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optim = FS_OPTSPACE;
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else if (strcmp(optarg, chg[FS_OPTTIME]) == 0)
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optim = FS_OPTTIME;
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else
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errx(10,
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"bad %s (options are `space' or `time')",
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"optimization preference");
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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usage();
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special = argv[0];
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openflags = Nflag ? O_RDONLY : O_RDWR;
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if (Fflag)
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fi = open(special, openflags);
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else
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fi = openpartition(special, openflags, &special);
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if (fi == -1)
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err(1, "%s", special);
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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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getsb(&sblock, special);
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#define CHANGEVAL(old, new, type, suffix) do \
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if ((new) != -1) { \
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if ((new) == (old)) \
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warnx("%s remains unchanged at %d%s", \
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(type), (old), (suffix)); \
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else { \
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warnx("%s changes from %d%s to %d%s", \
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(type), (old), (suffix), (new), (suffix)); \
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(old) = (new); \
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} \
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} while (/* CONSTCOND */0)
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warnx("tuning %s", special);
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CHANGEVAL(sblock.fs_maxbpg, maxbpg,
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"maximum blocks per file in a cylinder group", "");
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CHANGEVAL(sblock.fs_minfree, minfree,
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"minimum percentage of free space", "%");
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if (minfree != -1) {
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if (minfree >= MINFREE &&
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sblock.fs_optim == FS_OPTSPACE)
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warnx(OPTWARN, "time", ">=", MINFREE);
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if (minfree < MINFREE &&
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sblock.fs_optim == FS_OPTTIME)
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warnx(OPTWARN, "space", "<", MINFREE);
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}
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if (optim != -1) {
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if (sblock.fs_optim == optim) {
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warnx("%s remains unchanged as %s",
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"optimization preference",
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chg[optim]);
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} else {
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warnx("%s changes from %s to %s",
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"optimization preference",
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chg[sblock.fs_optim], chg[optim]);
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sblock.fs_optim = optim;
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if (sblock.fs_minfree >= MINFREE &&
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optim == FS_OPTSPACE)
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warnx(OPTWARN, "time", ">=", MINFREE);
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if (sblock.fs_minfree < MINFREE &&
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optim == FS_OPTTIME)
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warnx(OPTWARN, "space", "<", MINFREE);
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}
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}
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CHANGEVAL(sblock.fs_avgfilesize, avgfilesize,
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"average file size", "");
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CHANGEVAL(sblock.fs_avgfpdir, avgfpdir,
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"expected number of files per directory", "");
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if (Nflag) {
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fprintf(stdout, "tunefs: current settings of %s\n", special);
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fprintf(stdout, "\tmaximum contiguous block count %d\n",
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sblock.fs_maxcontig);
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fprintf(stdout,
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"\tmaximum blocks per file in a cylinder group %d\n",
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sblock.fs_maxbpg);
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fprintf(stdout, "\tminimum percentage of free space %d%%\n",
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sblock.fs_minfree);
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fprintf(stdout, "\toptimization preference: %s\n",
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chg[sblock.fs_optim]);
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fprintf(stdout, "\taverage file size: %d\n",
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sblock.fs_avgfilesize);
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fprintf(stdout,
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"\texpected number of files per directory: %d\n",
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sblock.fs_avgfpdir);
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fprintf(stdout, "tunefs: no changes made\n");
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exit(0);
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}
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memcpy(buf, (char *)&sblock, SBLOCKSIZE);
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bwrite(sblockloc, buf, SBLOCKSIZE, special);
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if (Aflag)
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for (i = 0; i < sblock.fs_ncg; i++)
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bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)),
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buf, SBLOCKSIZE, special);
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close(fi);
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exit(0);
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}
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static int
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getnum(const char *num, const char *desc, int min, int max)
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{
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int n;
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const char *errstr;
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n = strtonum(num, min, max, &errstr);
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if (errstr != NULL)
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errx(1, "Invalid number `%s' for %s: %s", num, desc, errstr);
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return (n);
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}
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static void
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usage(void)
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{
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extern char *__progname;
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fprintf(stderr,
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"usage: %s [-AFN] [-e maxbpg] [-g avgfilesize] "
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"[-h avgfpdir] [-m minfree]\n"
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"\t[-o optimize_preference] special | filesys\n",
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__progname);
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exit(2);
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}
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static void
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getsb(struct fs *fs, const char *file)
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{
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int i;
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for (i = 0; ; i++) {
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if (sblock_try[i] == -1)
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errx(5, "cannot find filesystem superblock");
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bread(sblock_try[i] / DEV_BSIZE, (char *)fs, SBLOCKSIZE, file);
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switch(fs->fs_magic) {
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case FS_UFS2_MAGIC:
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is_ufs2 = 1;
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/*FALLTHROUGH*/
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case FS_UFS1_MAGIC:
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break;
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default:
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continue;
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}
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if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2)
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continue;
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if ((is_ufs2 || fs->fs_flags & FS_FLAGS_UPDATED)
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&& fs->fs_sblockloc != sblock_try[i])
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continue;
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break;
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}
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sblockloc = sblock_try[i] / DEV_BSIZE;
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}
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static void
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bwrite(daddr_t blk, char *buffer, int size, const char *file)
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{
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if (pwrite(fi, buffer, size, blk * DEV_BSIZE) != size)
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err(7, "%s: writing %d bytes @ %lld", file, size,
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(long long)(blk * DEV_BSIZE));
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}
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static void
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bread(daddr_t blk, char *buffer, int cnt, const char *file)
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{
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if ((pread(fi, buffer, cnt, (off_t)blk * DEV_BSIZE)) != cnt)
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errx(5, "%s: reading %d bytes @ %lld", file, cnt,
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(long long)(blk * DEV_BSIZE));
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}
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static int
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openpartition(char *name, int flags, char **devicep)
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{
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char rawspec[PATH_MAX], *p;
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struct fstab *fs;
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int fd;
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fs = getfsfile(name);
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if (fs) {
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if ((p = strrchr(fs->fs_spec, '/')) != NULL) {
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snprintf(rawspec, sizeof(rawspec), "%.*s/r%s",
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(int)(p - fs->fs_spec), fs->fs_spec, p + 1);
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name = rawspec;
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} else
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name = fs->fs_spec;
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}
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fd = opendev(name, flags, 0, devicep);
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if (fd == -1 && errno == ENOENT)
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devicep = &name;
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return (fd);
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}
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