348 lines
9.1 KiB
C
348 lines
9.1 KiB
C
/* $NetBSD: tunefs.c,v 1.17 1998/08/25 19:18:17 ross 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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 1.17 1998/08/25 19:18:17 ross 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 <sys/stat.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 <errno.h>
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#include <err.h>
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#include <fcntl.h>
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#include <fstab.h>
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#include <stdio.h>
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#include <paths.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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/* 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 = 1;
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int needswap = 0;
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void bwrite __P((daddr_t, char *, int));
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int bread __P((daddr_t, char *, int));
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void getsb __P((struct fs *, const char *));
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int main __P((int, char *[]));
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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char *cp, *name;
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const char *special;
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struct stat st;
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int i;
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int Aflag = 0, Nflag = 0;
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struct fstab *fs;
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char *chg[2], device[MAXPATHLEN];
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argc--, argv++;
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if (argc < 2)
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usage();
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special = argv[argc - 1];
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fs = getfsfile(special);
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if (fs)
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special = fs->fs_spec;
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again:
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if (stat(special, &st) < 0) {
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if (*special != '/') {
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if (*special == 'r')
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special++;
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(void)snprintf(device, sizeof(device), "%s/%s",
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_PATH_DEV, special);
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special = device;
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goto again;
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}
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err(1, "%s", special);
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}
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if (!S_ISBLK(st.st_mode) && !S_ISCHR(st.st_mode))
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errx(10, "%s: not a block or character device", special);
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getsb(&sblock, special);
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chg[FS_OPTSPACE] = "space";
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chg[FS_OPTTIME] = "time";
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for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) {
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for (cp = &argv[0][1]; *cp; cp++)
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switch (*cp) {
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case 'A':
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Aflag++;
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continue;
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case 'N':
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Nflag++;
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continue;
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case 'a':
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name = "maximum contiguous block count";
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if (argc < 1)
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errx(10, "-a: missing %s", name);
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argc--, argv++;
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i = atoi(*argv);
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if (i < 1)
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errx(10, "%s must be >= 1 (was %s)",
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name, *argv);
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warnx("%s changes from %d to %d",
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name, sblock.fs_maxcontig, i);
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sblock.fs_maxcontig = i;
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continue;
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case 'd':
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name =
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"rotational delay between contiguous blocks";
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if (argc < 1)
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errx(10, "-d: missing %s", name);
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argc--, argv++;
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i = atoi(*argv);
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warnx("%s changes from %dms to %dms",
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name, sblock.fs_rotdelay, i);
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sblock.fs_rotdelay = i;
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continue;
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case 'e':
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name =
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"maximum blocks per file in a cylinder group";
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if (argc < 1)
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errx(10, "-e: missing %s", name);
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argc--, argv++;
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i = atoi(*argv);
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if (i < 1)
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errx(10, "%s must be >= 1 (was %s)",
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name, *argv);
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warnx("%s changes from %d to %d",
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name, sblock.fs_maxbpg, i);
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sblock.fs_maxbpg = i;
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continue;
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case 'm':
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name = "minimum percentage of free space";
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if (argc < 1)
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errx(10, "-m: missing %s", name);
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argc--, argv++;
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i = atoi(*argv);
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if (i < 0 || i > 99)
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errx(10, "bad %s (%s)", name, *argv);
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warnx("%s changes from %d%% to %d%%",
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name, sblock.fs_minfree, i);
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sblock.fs_minfree = i;
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if (i >= MINFREE &&
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sblock.fs_optim == FS_OPTSPACE)
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warnx(OPTWARN, "time", ">=", MINFREE);
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if (i < MINFREE &&
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sblock.fs_optim == FS_OPTTIME)
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warnx(OPTWARN, "space", "<", MINFREE);
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continue;
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case 'o':
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name = "optimization preference";
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if (argc < 1)
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errx(10, "-o: missing %s", name);
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argc--, argv++;
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if (strcmp(*argv, chg[FS_OPTSPACE]) == 0)
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i = FS_OPTSPACE;
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else if (strcmp(*argv, chg[FS_OPTTIME]) == 0)
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i = FS_OPTTIME;
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else
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errx(10, "bad %s (options are `space' or `time')",
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name);
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if (sblock.fs_optim == i) {
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warnx("%s remains unchanged as %s",
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name, chg[i]);
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continue;
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}
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warnx("%s changes from %s to %s",
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name, chg[sblock.fs_optim], chg[i]);
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sblock.fs_optim = i;
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if (sblock.fs_minfree >= MINFREE &&
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i == FS_OPTSPACE)
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warnx(OPTWARN, "time", ">=", MINFREE);
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if (sblock.fs_minfree < MINFREE &&
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i == FS_OPTTIME)
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warnx(OPTWARN, "space", "<", MINFREE);
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continue;
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case 't':
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name = "track skew in sectors";
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if (argc < 1)
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errx(10, "-t: missing %s", name);
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argc--, argv++;
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i = atoi(*argv);
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if (i < 0)
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errx(10, "%s: %s must be >= 0",
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*argv, name);
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warnx("%s changes from %d to %d",
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name, sblock.fs_trackskew, i);
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sblock.fs_trackskew = i;
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continue;
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default:
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usage();
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}
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}
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if (argc != 1)
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usage();
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if (Nflag) {
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fprintf(stdout, "tunefs: current settings\n");
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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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"\trotational delay between contiguous blocks %dms\n",
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sblock.fs_rotdelay);
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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, "\ttrack skew %d sectors\n",
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sblock.fs_trackskew);
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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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fi = open(special, 1);
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if (fi < 0)
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err(3, "cannot open %s for writing", special);
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memcpy(buf, (char *)&sblock, SBSIZE);
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if (needswap)
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ffs_sb_swap((struct fs*)buf, (struct fs*)buf, 1);
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bwrite((daddr_t)SBOFF / dev_bsize, buf, SBSIZE);
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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, SBSIZE);
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close(fi);
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exit(0);
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}
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void
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usage()
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{
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fprintf(stderr, "Usage: tunefs [-AN] tuneup-options special-device\n");
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fprintf(stderr, "where tuneup-options are:\n");
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fprintf(stderr, "\t-d rotational delay between contiguous blocks\n");
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fprintf(stderr, "\t-a maximum contiguous blocks\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-m minimum percentage of free space\n");
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fprintf(stderr, "\t-o optimization preference (`space' or `time')\n");
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fprintf(stderr, "\t-t track skew in sectors\n");
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exit(2);
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}
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void
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getsb(fs, file)
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struct fs *fs;
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const char *file;
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{
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fi = open(file, 0);
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if (fi < 0)
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err(3, "cannot open %s for reading", file);
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if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE))
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err(4, "%s: bad super block", file);
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if (fs->fs_magic != FS_MAGIC) {
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if (fs->fs_magic == bswap32(FS_MAGIC)) {
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needswap = 1;
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ffs_sb_swap(fs, fs, 0);
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} else
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err(5, "%s: bad magic number", file);
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}
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dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
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close(fi);
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}
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void
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bwrite(blk, buf, size)
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daddr_t blk;
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char *buf;
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int size;
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{
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if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0)
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err(6, "FS SEEK");
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if (write(fi, buf, size) != size)
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err(7, "FS WRITE");
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}
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int
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bread(bno, buf, cnt)
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daddr_t bno;
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char *buf;
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int cnt;
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{
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int i;
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if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0)
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return(1);
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if ((i = read(fi, buf, cnt)) != cnt) {
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for(i=0; i<sblock.fs_bsize; i++)
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buf[i] = 0;
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return (1);
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}
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return (0);
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}
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