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2d4046ef9f079c6b2cb218c1f4d1e40d4ffd9348
[unix-history] / usr / src / sbin / tunefs / tunefs.c
/*
* Copyright (c) 1983 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)tunefs.c 5.7 (Berkeley) %G%";
#endif /* not lint */
/*
* tunefs: change layout parameters to an existing file system.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/fs.h>
#include <sys/inode.h>
#include <stdio.h>
#include <fstab.h>
union {
struct fs sb;
char pad[MAXBSIZE];
} sbun;
#define sblock sbun.sb
int fi;
long dev_bsize = 1;
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)
goto 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, "/dev/%s", special);
special = device;
goto again;
}
fprintf(stderr, "tunefs: "); perror(special);
exit(1);
}
if ((st.st_mode & S_IFMT) != S_IFBLK &&
(st.st_mode & S_IFMT) != S_IFCHR)
fatal("%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)
fatal("-a: missing %s", name);
argc--, argv++;
i = atoi(*argv);
if (i < 1)
fatal("%s: %s must be >= 1",
*argv, name);
fprintf(stdout, "%s changes from %d to %d\n",
name, sblock.fs_maxcontig, i);
sblock.fs_maxcontig = i;
continue;
case 'd':
name =
"rotational delay between contiguous blocks";
if (argc < 1)
fatal("-d: missing %s", name);
argc--, argv++;
i = atoi(*argv);
fprintf(stdout,
"%s changes from %dms to %dms\n",
name, sblock.fs_rotdelay, i);
sblock.fs_rotdelay = i;
continue;
case 'e':
name =
"maximum blocks per file in a cylinder group";
if (argc < 1)
fatal("-e: missing %s", name);
argc--, argv++;
i = atoi(*argv);
if (i < 1)
fatal("%s: %s must be >= 1",
*argv, name);
fprintf(stdout, "%s changes from %d to %d\n",
name, sblock.fs_maxbpg, i);
sblock.fs_maxbpg = i;
continue;
case 'm':
name = "minimum percentage of free space";
if (argc < 1)
fatal("-m: missing %s", name);
argc--, argv++;
i = atoi(*argv);
if (i < 0 || i > 99)
fatal("%s: bad %s", *argv, name);
fprintf(stdout,
"%s changes from %d%% to %d%%\n",
name, sblock.fs_minfree, i);
sblock.fs_minfree = i;
if (i >= 10 && sblock.fs_optim == FS_OPTSPACE)
fprintf(stdout, "should optimize %s",
"for time with minfree >= 10%\n");
if (i < 10 && sblock.fs_optim == FS_OPTTIME)
fprintf(stdout, "should optimize %s",
"for space with minfree < 10%\n");
continue;
case 'o':
name = "optimization preference";
if (argc < 1)
fatal("-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
fatal("%s: bad %s (options are `space' or `time')",
*argv, name);
if (sblock.fs_optim == i) {
fprintf(stdout,
"%s remains unchanged as %s\n",
name, chg[i]);
continue;
}
fprintf(stdout,
"%s changes from %s to %s\n",
name, chg[sblock.fs_optim], chg[i]);
sblock.fs_optim = i;
if (sblock.fs_minfree >= 10 && i == FS_OPTSPACE)
fprintf(stdout, "should optimize %s",
"for time with minfree >= 10%\n");
if (sblock.fs_minfree < 10 && i == FS_OPTTIME)
fprintf(stdout, "should optimize %s",
"for space with minfree < 10%\n");
continue;
default:
fatal("-%c: unknown flag", *cp);
}
}
if (argc != 1)
goto usage;
bwrite(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);
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);
}
getsb(fs, file)
register struct fs *fs;
char *file;
{
fi = open(file, 2);
if (fi < 0) {
fprintf(stderr, "cannot open");
perror(file);
exit(3);
}
if (bread(SBOFF, (char *)fs, SBSIZE)) {
fprintf(stderr, "bad super block");
perror(file);
exit(4);
}
if (fs->fs_magic != FS_MAGIC) {
fprintf(stderr, "%s: bad magic number\n", file);
exit(5);
}
dev_bsize = fs->fs_fsize / fsbtodb(fs, 1);
}
bwrite(blk, buf, size)
char *buf;
daddr_t blk;
register size;
{
if (lseek(fi, blk * dev_bsize, 0) < 0) {
perror("FS SEEK");
exit(6);
}
if (write(fi, buf, size) != size) {
perror("FS WRITE");
exit(7);
}
}
bread(bno, buf, cnt)
daddr_t bno;
char *buf;
{
register i;
if (lseek(fi, bno * dev_bsize, 0) < 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);
}
/* VARARGS1 */
fatal(fmt, arg1, arg2)
char *fmt, *arg1, *arg2;
{
fprintf(stderr, "tunefs: ");
fprintf(stderr, fmt, arg1, arg2);
putc('\n', stderr);
exit(10);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.