NetBSD/sbin/tunefs/tunefs.c

496 lines
13 KiB
C

/* $NetBSD: tunefs.c,v 1.42 2009/09/13 18:30:30 bouyer 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)tunefs.c 8.3 (Berkeley) 5/3/95";
#else
__RCSID("$NetBSD: tunefs.c,v 1.42 2009/09/13 18:30:30 bouyer Exp $");
#endif
#endif /* not lint */
/*
* tunefs: change layout parameters to an existing file system.
*/
#include <sys/param.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>
#include <ufs/ufs/ufs_wapbl.h>
#include <machine/bswap.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 needswap = 0;
int is_ufs2 = 0;
off_t sblockloc;
static off_t sblock_try[] = SBLOCKSEARCH;
static void bwrite(daddr_t, char *, int, const char *);
static void bread(daddr_t, char *, int, const char *);
static void change_log_info(long long);
static void getsb(struct fs *, const char *);
static int openpartition(const char *, int, char *, size_t);
static void show_log_info(void);
static void usage(void);
int
main(int argc, char *argv[])
{
int i, ch, Aflag, Fflag, Nflag, openflags;
const char *special, *chg[2];
char device[MAXPATHLEN];
int maxbpg, minfree, optim;
int avgfilesize, avgfpdir;
long long logfilesize;
Aflag = Fflag = Nflag = 0;
maxbpg = minfree = optim = -1;
avgfilesize = avgfpdir = -1;
logfilesize = -1;
chg[FS_OPTSPACE] = "space";
chg[FS_OPTTIME] = "time";
while ((ch = getopt(argc, argv, "AFNe:g:h:l:m:o:")) != -1) {
switch (ch) {
case 'A':
Aflag++;
break;
case 'F':
Fflag++;
break;
case 'N':
Nflag++;
break;
case 'e':
maxbpg = strsuftoll(
"maximum blocks per file in a cylinder group",
optarg, 1, INT_MAX);
break;
case 'g':
avgfilesize = strsuftoll("average file size", optarg,
1, INT_MAX);
break;
case 'h':
avgfpdir = strsuftoll(
"expected number of files per directory",
optarg, 1, INT_MAX);
break;
case 'l':
logfilesize = strsuftoll("journal log file size",
optarg, 0, INT_MAX);
break;
case 'm':
minfree = strsuftoll("minimum percentage of free space",
optarg, 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 (logfilesize >= 0)
change_log_info(logfilesize);
if (Nflag) {
printf("tunefs: current settings of %s\n", special);
printf("\tmaximum contiguous block count %d\n",
sblock.fs_maxcontig);
printf("\tmaximum blocks per file in a cylinder group %d\n",
sblock.fs_maxbpg);
printf("\tminimum percentage of free space %d%%\n",
sblock.fs_minfree);
printf("\toptimization preference: %s\n", chg[sblock.fs_optim]);
printf("\taverage file size: %d\n", sblock.fs_avgfilesize);
printf("\texpected number of files per directory: %d\n",
sblock.fs_avgfpdir);
show_log_info();
printf("tunefs: no changes made\n");
exit(0);
}
memcpy(buf, (char *)&sblock, SBLOCKSIZE);
if (needswap)
ffs_sb_swap((struct fs*)buf, (struct fs*)buf);
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 void
show_log_info(void)
{
const char *loc;
uint64_t size, blksize, logsize;
int print;
switch (sblock.fs_journal_location) {
case UFS_WAPBL_JOURNALLOC_NONE:
print = blksize = 0;
/* nothing */
break;
case UFS_WAPBL_JOURNALLOC_END_PARTITION:
loc = "end of partition";
size = sblock.fs_journallocs[UFS_WAPBL_EPART_COUNT];
blksize = sblock.fs_journallocs[UFS_WAPBL_EPART_BLKSZ];
print = 1;
break;
case UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM:
loc = "in filesystem";
size = sblock.fs_journallocs[UFS_WAPBL_INFS_COUNT];
blksize = sblock.fs_journallocs[UFS_WAPBL_INFS_BLKSZ];
print = 1;
break;
default:
loc = "unknown";
size = blksize = 0;
print = 1;
break;
}
if (print) {
logsize = size * blksize;
printf("\tjournal log file location: %s\n", loc);
printf("\tjournal log file size: ");
if (logsize == 0)
printf("0\n");
else {
char sizebuf[8];
humanize_number(sizebuf, 6, size * blksize, "B",
HN_AUTOSCALE, HN_B | HN_NOSPACE | HN_DECIMAL);
printf("%s (%" PRId64 " bytes)", sizebuf, logsize);
}
printf("\n");
printf("\tjournal log flags:");
if (sblock.fs_journal_flags & UFS_WAPBL_FLAGS_CREATE_LOG)
printf(" create-log");
if (sblock.fs_journal_flags & UFS_WAPBL_FLAGS_CLEAR_LOG)
printf(" clear-log");
printf("\n");
}
}
static void
change_log_info(long long logfilesize)
{
/*
* NOTES:
* - only operate on in-filesystem log sizes
* - can't change size of existing log
* - if current is same, no action
* - if current is zero and new is non-zero, set flag to create log
* on next mount
* - if current is non-zero and new is zero, set flag to clear log
* on next mount
*/
int in_fs_log;
uint64_t old_size;
old_size = 0;
switch (sblock.fs_journal_location) {
case UFS_WAPBL_JOURNALLOC_END_PARTITION:
in_fs_log = 0;
old_size = sblock.fs_journallocs[UFS_WAPBL_EPART_COUNT] *
sblock.fs_journallocs[UFS_WAPBL_EPART_BLKSZ];
break;
case UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM:
in_fs_log = 1;
old_size = sblock.fs_journallocs[UFS_WAPBL_INFS_COUNT] *
sblock.fs_journallocs[UFS_WAPBL_INFS_BLKSZ];
break;
case UFS_WAPBL_JOURNALLOC_NONE:
default:
in_fs_log = 0;
old_size = 0;
break;
}
if (logfilesize == 0) {
/*
* Don't clear out the locators - the kernel might need
* these to find the log! Just set the "clear the log"
* flag and let the kernel do the rest.
*/
sblock.fs_journal_flags |= UFS_WAPBL_FLAGS_CLEAR_LOG;
sblock.fs_journal_flags &= ~UFS_WAPBL_FLAGS_CREATE_LOG;
warnx("log file size cleared from %" PRIu64 "", old_size);
return;
}
if (!in_fs_log && logfilesize > 0 && old_size > 0)
errx(1, "Can't change size of non-in-filesystem log");
if (old_size == (uint64_t)logfilesize && logfilesize > 0) {
/* no action */
warnx("log file size remains unchanged at %lld", logfilesize);
return;
}
if (old_size == 0) {
/* create new log of desired size next mount */
sblock.fs_journal_location = UFS_WAPBL_JOURNALLOC_IN_FILESYSTEM;
sblock.fs_journallocs[UFS_WAPBL_INFS_ADDR] = 0;
sblock.fs_journallocs[UFS_WAPBL_INFS_COUNT] = logfilesize;
sblock.fs_journallocs[UFS_WAPBL_INFS_BLKSZ] = 0;
sblock.fs_journallocs[UFS_WAPBL_INFS_INO] = 0;
sblock.fs_journal_flags |= UFS_WAPBL_FLAGS_CREATE_LOG;
sblock.fs_journal_flags &= ~UFS_WAPBL_FLAGS_CLEAR_LOG;
warnx("log file size set to %lld", logfilesize);
} else {
errx(1,
"Can't change existing log size from %" PRIu64 " to %lld",
old_size, logfilesize);
}
}
static void
usage(void)
{
fprintf(stderr, "usage: tunefs [-AFN] tuneup-options special-device\n");
fprintf(stderr, "where tuneup-options are:\n");
fprintf(stderr, "\t-e maximum blocks per file in a cylinder group\n");
fprintf(stderr, "\t-g average file size\n");
fprintf(stderr, "\t-h expected number of files per directory\n");
fprintf(stderr, "\t-l journal log file size (`0' to clear journal)\n");
fprintf(stderr, "\t-m minimum percentage of free space\n");
fprintf(stderr, "\t-o optimization preference (`space' or `time')\n");
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;
case FS_UFS2_MAGIC_SWAPPED:
is_ufs2 = 1;
/*FALLTHROUGH*/
case FS_UFS1_MAGIC_SWAPPED:
warnx("%s: swapping byte order", file);
needswap = 1;
ffs_sb_swap(fs, fs);
break;
default:
continue;
}
if (!is_ufs2 && sblock_try[i] == SBLOCK_UFS2)
continue;
if ((is_ufs2 || fs->fs_old_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(daddr_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(daddr_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);
}