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cleanups from cgd
[unix-history] / usr / src / sbin / tunefs / tunefs.c
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* %sccs.include.redist.c%
*/
#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) %G%";
#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));
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 '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");
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
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);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.