413 lines
11 KiB
C
413 lines
11 KiB
C
/* $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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)tunefs.c 8.3 (Berkeley) 5/3/95";
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#else
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__RCSID("$NetBSD: tunefs.c,v 1.33 2005/01/19 20:46:16 xtraeme Exp $");
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#endif
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#endif /* not lint */
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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>
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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 <machine/bswap.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 <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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long dev_bsize = 512;
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int needswap = 0;
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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(const char *, int, char *, size_t);
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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 OPTSTRINGBASE "AFNe:g:h:m:o:"
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#ifdef TUNEFS_SOFTDEP
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int softdep;
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#define OPTSTRING OPTSTRINGBASE ## "n:"
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#else
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#define OPTSTRING OPTSTRINGBASE
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#endif
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int i, ch, Aflag, Fflag, Nflag, openflags;
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const char *special, *chg[2];
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char device[MAXPATHLEN];
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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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#ifdef TUNEFS_SOFTDEP
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softdep = -1;
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#endif
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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++;
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break;
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case 'F':
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Fflag++;
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break;
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case 'N':
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Nflag++;
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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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#ifdef TUNEFS_SOFTDEP
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case 'n':
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if (strcmp(optarg, "enable") == 0)
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softdep = 1;
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else if (strcmp(optarg, "disable") == 0)
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softdep = 0;
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else {
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errx(10, "bad soft dependencies "
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"(options are `enable' or `disable')");
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}
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break;
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#endif
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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, device, sizeof(device));
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special = device;
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}
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if (fi == -1)
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err(1, "%s", special);
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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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#ifdef TUNEFS_SOFTDEP
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if (softdep == 1) {
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sblock.fs_flags |= FS_DOSOFTDEP;
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warnx("soft dependencies set");
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} else if (softdep == 0) {
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sblock.fs_flags &= ~FS_DOSOFTDEP;
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warnx("soft dependencies cleared");
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}
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#endif
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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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#ifdef TUNEFS_SOFTDEP
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fprintf(stdout, "\tsoft dependencies: %s\n",
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(sblock.fs_flags & FS_DOSOFTDEP) ? "on" : "off");
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#endif
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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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if (needswap)
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ffs_sb_swap((struct fs*)buf, (struct fs*)buf);
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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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long n;
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char *ep;
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n = strtol(num, &ep, 10);
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if (ep[0] != '\0')
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errx(1, "Invalid number `%s' for %s", num, desc);
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if ((int) n < min)
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errx(1, "%s `%s' too small (minimum is %d)", desc, num, min);
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if ((int) n > max)
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errx(1, "%s `%s' too large (maximum is %d)", desc, num, max);
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return ((int)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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fprintf(stderr, "usage: tunefs [-AFN] tuneup-options special-device\n");
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fprintf(stderr, "where tuneup-options are:\n");
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fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n");
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fprintf(stderr, "\t-g average file size\n");
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fprintf(stderr, "\t-h expected number of files per directory\n");
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fprintf(stderr, "\t-m minimum percentage of free space\n");
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#ifdef TUNEFS_SOFTDEP
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fprintf(stderr, "\t-n soft dependencies (`enable' or `disable')\n");
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#endif
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fprintf(stderr, "\t-o optimization preference (`space' or `time')\n");
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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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case FS_UFS2_MAGIC_SWAPPED:
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is_ufs2 = 1;
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/*FALLTHROUGH*/
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case FS_UFS1_MAGIC_SWAPPED:
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warnx("%s: swapping byte order", file);
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needswap = 1;
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ffs_sb_swap(fs, fs);
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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_old_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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dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
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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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off_t offset;
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offset = (off_t)blk * dev_bsize;
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if (lseek(fi, offset, SEEK_SET) == -1)
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err(6, "%s: seeking to %lld", file, (long long)offset);
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if (write(fi, buffer, size) != size)
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err(7, "%s: writing %d bytes", file, size);
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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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off_t offset;
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int i;
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offset = (off_t)blk * dev_bsize;
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if (lseek(fi, offset, SEEK_SET) == -1)
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err(4, "%s: seeking to %lld", file, (long long)offset);
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if ((i = read(fi, buffer, cnt)) != cnt)
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errx(5, "%s: short read", file);
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}
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static int
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openpartition(const char *name, int flags, char *device, size_t devicelen)
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{
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char rawspec[MAXPATHLEN], *p;
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struct fstab *fs;
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int fd, oerrno;
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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 = opendisk(name, flags, device, devicelen, 0);
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if (fd == -1 && errno == ENOENT) {
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oerrno = errno;
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strlcpy(device, name, devicelen);
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errno = oerrno;
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}
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return (fd);
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}
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