OpenBSD-4.6/sbin/tunefs/tunefs.c
/* $OpenBSD: tunefs.c,v 1.29 2009/06/21 00:38:22 martynas Exp $ */
/* $NetBSD: tunefs.c,v 1.33 2005/01/19 20:46:16 xtraeme Exp $ */
/*
* 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. 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 const char copyright[] =
"@(#) Copyright (c) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)tunefs.c 8.3 (Berkeley) 5/3/95";
#else
static const char rcsid[] = "$OpenBSD: tunefs.c,v 1.29 2009/06/21 00:38:22 martynas Exp $";
#endif
#endif /* not lint */
/*
* tunefs: change layout parameters to an existing file system.
*/
#include <sys/param.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fstab.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.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
char buf[MAXBSIZE];
int fi;
long dev_bsize = 512;
int is_ufs2 = 0;
off_t sblockloc;
static off_t sblock_try[] = SBLOCKSEARCH;
static void bwrite(daddr64_t, char *, int, const char *);
static void bread(daddr64_t, char *, int, const char *);
static int getnum(const char *, const char *, int, int);
static void getsb(struct fs *, const char *);
static int openpartition(const char *, int, char *, size_t);
static void usage(void);
int
main(int argc, char *argv[])
{
#define OPTSTRING "AFNe:g:h:m:o:"
int i, ch, Aflag, Fflag, Nflag, openflags;
const char *special, *chg[2];
char device[MAXPATHLEN];
int maxbpg, minfree, optim;
int avgfilesize, avgfpdir;
Aflag = Fflag = Nflag = 0;
maxbpg = minfree = optim = -1;
avgfilesize = avgfpdir = -1;
chg[FS_OPTSPACE] = "space";
chg[FS_OPTTIME] = "time";
while ((ch = getopt(argc, argv, OPTSTRING)) != -1) {
switch (ch) {
case 'A':
Aflag++;
break;
case 'F':
Fflag++;
break;
case 'N':
Nflag++;
break;
case 'e':
maxbpg = getnum(optarg,
"maximum blocks per file in a cylinder group",
1, INT_MAX);
break;
case 'g':
avgfilesize = getnum(optarg,
"average file size", 1, INT_MAX);
break;
case 'h':
avgfpdir = getnum(optarg,
"expected number of files per directory",
1, INT_MAX);
break;
case 'm':
minfree = getnum(optarg,
"minimum percentage of free space", 0, 99);
break;
case 'o':
if (strcmp(optarg, chg[FS_OPTSPACE]) == 0)
optim = FS_OPTSPACE;
else if (strcmp(optarg, chg[FS_OPTTIME]) == 0)
optim = FS_OPTTIME;
else
errx(10,
"bad %s (options are `space' or `time')",
"optimization preference");
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
special = argv[0];
openflags = Nflag ? O_RDONLY : O_RDWR;
if (Fflag)
fi = open(special, openflags);
else {
fi = openpartition(special, openflags, device, sizeof(device));
special = device;
}
if (fi == -1)
err(1, "%s", special);
getsb(&sblock, special);
#define CHANGEVAL(old, new, type, suffix) do \
if ((new) != -1) { \
if ((new) == (old)) \
warnx("%s remains unchanged at %d%s", \
(type), (old), (suffix)); \
else { \
warnx("%s changes from %d%s to %d%s", \
(type), (old), (suffix), (new), (suffix)); \
(old) = (new); \
} \
} while (/* CONSTCOND */0)
warnx("tuning %s", special);
CHANGEVAL(sblock.fs_maxbpg, maxbpg,
"maximum blocks per file in a cylinder group", "");
CHANGEVAL(sblock.fs_minfree, minfree,
"minimum percentage of free space", "%");
if (minfree != -1) {
if (minfree >= MINFREE &&
sblock.fs_optim == FS_OPTSPACE)
warnx(OPTWARN, "time", ">=", MINFREE);
if (minfree < MINFREE &&
sblock.fs_optim == FS_OPTTIME)
warnx(OPTWARN, "space", "<", MINFREE);
}
if (optim != -1) {
if (sblock.fs_optim == optim) {
warnx("%s remains unchanged as %s",
"optimization preference",
chg[optim]);
} else {
warnx("%s changes from %s to %s",
"optimization preference",
chg[sblock.fs_optim], chg[optim]);
sblock.fs_optim = optim;
if (sblock.fs_minfree >= MINFREE &&
optim == FS_OPTSPACE)
warnx(OPTWARN, "time", ">=", MINFREE);
if (sblock.fs_minfree < MINFREE &&
optim == FS_OPTTIME)
warnx(OPTWARN, "space", "<", MINFREE);
}
}
CHANGEVAL(sblock.fs_avgfilesize, avgfilesize,
"average file size", "");
CHANGEVAL(sblock.fs_avgfpdir, avgfpdir,
"expected number of files per directory", "");
if (Nflag) {
fprintf(stdout, "tunefs: current settings of %s\n", special);
fprintf(stdout, "\tmaximum contiguous block count %d\n",
sblock.fs_maxcontig);
fprintf(stdout,
"\tmaximum blocks per file in a cylinder group %d\n",
sblock.fs_maxbpg);
fprintf(stdout, "\tminimum percentage of free space %d%%\n",
sblock.fs_minfree);
fprintf(stdout, "\toptimization preference: %s\n",
chg[sblock.fs_optim]);
fprintf(stdout, "\taverage file size: %d\n",
sblock.fs_avgfilesize);
fprintf(stdout,
"\texpected number of files per directory: %d\n",
sblock.fs_avgfpdir);
fprintf(stdout, "tunefs: no changes made\n");
exit(0);
}
memcpy(buf, (char *)&sblock, SBLOCKSIZE);
bwrite(sblockloc, buf, SBLOCKSIZE, special);
if (Aflag)
for (i = 0; i < sblock.fs_ncg; i++)
bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)),
buf, SBLOCKSIZE, special);
close(fi);
exit(0);
}
static int
getnum(const char *num, const char *desc, int min, int max)
{
int n;
const char *errstr;
n = strtonum(num, min, max, &errstr);
if (errstr != NULL)
errx(1, "Invalid number `%s' for %s: %s", num, desc, errstr);
return (n);
}
static void
usage(void)
{
extern char *__progname;
fprintf(stderr,
"usage: %s [-AFN] [-e maxbpg] [-g avgfilesize] "
"[-h avgfpdir] [-m minfree]\n"
"\t[-o optimize_preference] special | filesys\n",
__progname);
exit(2);
}
static void
getsb(struct fs *fs, const char *file)
{
int i;
for (i = 0; ; i++) {
if (sblock_try[i] == -1)
errx(5, "cannot find filesystem superblock");
bread(sblock_try[i] / dev_bsize, (char *)fs, SBLOCKSIZE, file);
switch(fs->fs_magic) {
case FS_UFS2_MAGIC:
is_ufs2 = 1;
/*FALLTHROUGH*/
case FS_UFS1_MAGIC:
break;
default:
continue;
}
if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2)
continue;
if ((is_ufs2 || fs->fs_flags & FS_FLAGS_UPDATED)
&& fs->fs_sblockloc != sblock_try[i])
continue;
break;
}
dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
sblockloc = sblock_try[i] / dev_bsize;
}
static void
bwrite(daddr64_t blk, char *buffer, int size, const char *file)
{
off_t offset;
offset = (off_t)blk * dev_bsize;
if (lseek(fi, offset, SEEK_SET) == -1)
err(6, "%s: seeking to %lld", file, (long long)offset);
if (write(fi, buffer, size) != size)
err(7, "%s: writing %d bytes", file, size);
}
static void
bread(daddr64_t blk, char *buffer, int cnt, const char *file)
{
off_t offset;
int i;
offset = (off_t)blk * dev_bsize;
if (lseek(fi, offset, SEEK_SET) == -1)
err(4, "%s: seeking to %lld", file, (long long)offset);
if ((i = read(fi, buffer, cnt)) != cnt)
errx(5, "%s: short read", file);
}
static int
openpartition(const char *name, int flags, char *device, size_t devicelen)
{
char rawspec[MAXPATHLEN], *p;
struct fstab *fs;
int fd, oerrno;
fs = getfsfile(name);
if (fs) {
if ((p = strrchr(fs->fs_spec, '/')) != NULL) {
snprintf(rawspec, sizeof(rawspec), "%.*s/r%s",
(int)(p - fs->fs_spec), fs->fs_spec, p + 1);
name = rawspec;
} else
name = fs->fs_spec;
}
fd = opendisk(name, flags, device, devicelen, 0);
if (fd == -1 && errno == ENOENT) {
oerrno = errno;
strlcpy(device, name, devicelen);
errno = oerrno;
}
return (fd);
}