16a7269ee5
parameters are. You can use dumpfs, but that's not obvious which settings are tuneable, and is far from clear to the non-guru (it's like using a hexdump of a tar archive to get a table-of-contents). There is also an undocumented option in the man page that can be dangerous. Suppose your disk driver decides to scramble all writes while you tell tunefs to update all backup superblocks. This suggested change adds a '-p' (print) switch to bring it in line with some SVR4 systems. (Slightly changed by me, mostly for optics. - joerg) Submitted by: peter@haywire.dialix.com
312 lines
8.3 KiB
C
312 lines
8.3 KiB
C
/*
|
|
* Copyright (c) 1983, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char copyright[] =
|
|
"@(#) Copyright (c) 1983, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
static char sccsid[] = "@(#)tunefs.c 8.2 (Berkeley) 4/19/94";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* tunefs: change layout parameters to an existing file system.
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <ufs/ffs/fs.h>
|
|
|
|
#include <errno.h>
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <fstab.h>
|
|
#include <stdio.h>
|
|
#include <paths.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
/* the optimization warning string template */
|
|
#define OPTWARN "should optimize for %s with minfree %s %d%%"
|
|
|
|
union {
|
|
struct fs sb;
|
|
char pad[MAXBSIZE];
|
|
} sbun;
|
|
#define sblock sbun.sb
|
|
|
|
int fi;
|
|
long dev_bsize = 1;
|
|
|
|
void bwrite(daddr_t, char *, int);
|
|
int bread(daddr_t, char *, int);
|
|
void getsb(struct fs *, char *);
|
|
void usage __P((void));
|
|
void printfs __P((void));
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
char *cp, *special, *name;
|
|
struct stat st;
|
|
int i;
|
|
int Aflag = 0;
|
|
struct fstab *fs;
|
|
char *chg[2], device[MAXPATHLEN];
|
|
|
|
argc--, argv++;
|
|
if (argc < 2)
|
|
usage();
|
|
special = argv[argc - 1];
|
|
fs = getfsfile(special);
|
|
if (fs)
|
|
special = fs->fs_spec;
|
|
again:
|
|
if (stat(special, &st) < 0) {
|
|
if (*special != '/') {
|
|
if (*special == 'r')
|
|
special++;
|
|
(void)sprintf(device, "%s/%s", _PATH_DEV, special);
|
|
special = device;
|
|
goto again;
|
|
}
|
|
err(1, "%s", special);
|
|
}
|
|
if ((st.st_mode & S_IFMT) != S_IFBLK &&
|
|
(st.st_mode & S_IFMT) != S_IFCHR)
|
|
errx(10, "%s: not a block or character device", special);
|
|
getsb(&sblock, special);
|
|
for (; argc > 0 && argv[0][0] == '-'; argc--, argv++) {
|
|
for (cp = &argv[0][1]; *cp; cp++)
|
|
switch (*cp) {
|
|
|
|
case 'A':
|
|
Aflag++;
|
|
continue;
|
|
|
|
case 'p':
|
|
printfs();
|
|
exit(0);
|
|
|
|
case 'a':
|
|
name = "maximum contiguous block count";
|
|
if (argc < 1)
|
|
errx(10, "-a: missing %s", name);
|
|
argc--, argv++;
|
|
i = atoi(*argv);
|
|
if (i < 1)
|
|
errx(10, "%s must be >= 1 (was %s)",
|
|
name, *argv);
|
|
warnx("%s changes from %d to %d",
|
|
name, sblock.fs_maxcontig, i);
|
|
sblock.fs_maxcontig = i;
|
|
continue;
|
|
|
|
case 'd':
|
|
name =
|
|
"rotational delay between contiguous blocks";
|
|
if (argc < 1)
|
|
errx(10, "-d: missing %s", name);
|
|
argc--, argv++;
|
|
i = atoi(*argv);
|
|
warnx("%s changes from %dms to %dms",
|
|
name, sblock.fs_rotdelay, i);
|
|
sblock.fs_rotdelay = i;
|
|
continue;
|
|
|
|
case 'e':
|
|
name =
|
|
"maximum blocks per file in a cylinder group";
|
|
if (argc < 1)
|
|
errx(10, "-e: missing %s", name);
|
|
argc--, argv++;
|
|
i = atoi(*argv);
|
|
if (i < 1)
|
|
errx(10, "%s must be >= 1 (was %s)",
|
|
name, *argv);
|
|
warnx("%s changes from %d to %d",
|
|
name, sblock.fs_maxbpg, i);
|
|
sblock.fs_maxbpg = i;
|
|
continue;
|
|
|
|
case 'm':
|
|
name = "minimum percentage of free space";
|
|
if (argc < 1)
|
|
errx(10, "-m: missing %s", name);
|
|
argc--, argv++;
|
|
i = atoi(*argv);
|
|
if (i < 0 || i > 99)
|
|
errx(10, "bad %s (%s)", name, *argv);
|
|
warnx("%s changes from %d%% to %d%%",
|
|
name, sblock.fs_minfree, i);
|
|
sblock.fs_minfree = i;
|
|
if (i >= MINFREE &&
|
|
sblock.fs_optim == FS_OPTSPACE)
|
|
warnx(OPTWARN, "time", ">=", MINFREE);
|
|
if (i < MINFREE &&
|
|
sblock.fs_optim == FS_OPTTIME)
|
|
warnx(OPTWARN, "space", "<", MINFREE);
|
|
continue;
|
|
|
|
case 'o':
|
|
name = "optimization preference";
|
|
if (argc < 1)
|
|
errx(10, "-o: missing %s", name);
|
|
argc--, argv++;
|
|
chg[FS_OPTSPACE] = "space";
|
|
chg[FS_OPTTIME] = "time";
|
|
if (strcmp(*argv, chg[FS_OPTSPACE]) == 0)
|
|
i = FS_OPTSPACE;
|
|
else if (strcmp(*argv, chg[FS_OPTTIME]) == 0)
|
|
i = FS_OPTTIME;
|
|
else
|
|
errx(10, "bad %s (options are `space' or `time')",
|
|
name);
|
|
if (sblock.fs_optim == i) {
|
|
warnx("%s remains unchanged as %s",
|
|
name, chg[i]);
|
|
continue;
|
|
}
|
|
warnx("%s changes from %s to %s",
|
|
name, chg[sblock.fs_optim], chg[i]);
|
|
sblock.fs_optim = i;
|
|
if (sblock.fs_minfree >= MINFREE &&
|
|
i == FS_OPTSPACE)
|
|
warnx(OPTWARN, "time", ">=", MINFREE);
|
|
if (sblock.fs_minfree < MINFREE &&
|
|
i == FS_OPTTIME)
|
|
warnx(OPTWARN, "space", "<", MINFREE);
|
|
continue;
|
|
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
if (argc != 1)
|
|
usage();
|
|
bwrite((daddr_t)SBOFF / dev_bsize, (char *)&sblock, SBSIZE);
|
|
if (Aflag)
|
|
for (i = 0; i < sblock.fs_ncg; i++)
|
|
bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)),
|
|
(char *)&sblock, SBSIZE);
|
|
close(fi);
|
|
exit(0);
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
|
|
fprintf(stderr, "Usage: tunefs tuneup-options special-device\n");
|
|
fprintf(stderr, "where tuneup-options are:\n");
|
|
fprintf(stderr, "\t-a maximum contiguous blocks\n");
|
|
fprintf(stderr, "\t-d rotational delay between contiguous blocks\n");
|
|
fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n");
|
|
fprintf(stderr, "\t-m minimum percentage of free space\n");
|
|
fprintf(stderr, "\t-o optimization preference (`space' or `time')\n");
|
|
fprintf(stderr, "\t-p no change - just prints current tuneable settings\n");
|
|
exit(2);
|
|
}
|
|
|
|
void
|
|
getsb(fs, file)
|
|
register struct fs *fs;
|
|
char *file;
|
|
{
|
|
|
|
fi = open(file, 2);
|
|
if (fi < 0)
|
|
err(3, "cannot open %s", file);
|
|
if (bread((daddr_t)SBOFF, (char *)fs, SBSIZE))
|
|
err(4, "%s: bad super block", file);
|
|
if (fs->fs_magic != FS_MAGIC)
|
|
err(5, "%s: bad magic number", file);
|
|
dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
|
|
}
|
|
|
|
void
|
|
printfs()
|
|
{
|
|
warnx("maximum contiguous block count: (-a) %d",
|
|
sblock.fs_maxcontig);
|
|
warnx("rotational delay between contiguous blocks: (-d) %d ms",
|
|
sblock.fs_rotdelay);
|
|
warnx("maximum blocks per file in a cylinder group: (-e) %d",
|
|
sblock.fs_maxbpg);
|
|
warnx("minimum percentage of free space: (-m) %d%%",
|
|
sblock.fs_minfree);
|
|
warnx("optimization preference: (-o) %s",
|
|
sblock.fs_optim == FS_OPTSPACE ? "space" : "time");
|
|
if (sblock.fs_minfree >= MINFREE &&
|
|
sblock.fs_optim == FS_OPTSPACE)
|
|
warnx(OPTWARN, "time", ">=", MINFREE);
|
|
if (sblock.fs_minfree < MINFREE &&
|
|
sblock.fs_optim == FS_OPTTIME)
|
|
warnx(OPTWARN, "space", "<", MINFREE);
|
|
}
|
|
|
|
void
|
|
bwrite(blk, buf, size)
|
|
daddr_t blk;
|
|
char *buf;
|
|
int size;
|
|
{
|
|
|
|
if (lseek(fi, (off_t)blk * dev_bsize, SEEK_SET) < 0)
|
|
err(6, "FS SEEK");
|
|
if (write(fi, buf, size) != size)
|
|
err(7, "FS WRITE");
|
|
}
|
|
|
|
int
|
|
bread(bno, buf, cnt)
|
|
daddr_t bno;
|
|
char *buf;
|
|
int cnt;
|
|
{
|
|
int i;
|
|
|
|
if (lseek(fi, (off_t)bno * dev_bsize, SEEK_SET) < 0)
|
|
return(1);
|
|
if ((i = read(fi, buf, cnt)) != cnt) {
|
|
for(i=0; i<sblock.fs_bsize; i++)
|
|
buf[i] = 0;
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|