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Allow tuning of read-only mounted file system.

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Reviewed by:	Bruce Evans	<bde@zeta.org.au>
This commit is contained in:
luoqi 1999-01-20 01:22:39 +00:00
parent b1b3d7c0bc
commit bfbf2fe72f
1 changed files with 47 additions and 4 deletions
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51
sbin/tunefs/tunefs.c
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@ -42,16 +42,18 @@ static const char copyright[] =
static char sccsid[] = "@(#)tunefs.c 8.2 (Berkeley) 4/19/94";
#endif
static const char rcsid[] =
"$Id$";
"$Id: tunefs.c,v 1.6 1998/08/03 06:41:20 charnier Exp $";
#endif /* not lint */
/*
* tunefs: change layout parameters to an existing file system.
*/
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <ufs/ffs/fs.h>
#include <ufs/ufs/ufsmount.h>
#include <err.h>
#include <fcntl.h>
@ -59,6 +61,7 @@ static const char rcsid[] =
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/* the optimization warning string template */
@ -78,6 +81,7 @@ int bread(daddr_t, char *, int);
void getsb(struct fs *, char *);
void usage __P((void));
void printfs __P((void));
char *rawname __P((char *, char *));
int
main(argc, argv)
@ -87,17 +91,27 @@ main(argc, argv)
char *cp, *special, *name, *action;
struct stat st;
int i;
int Aflag = 0;
int Aflag = 0, active = 0;
struct fstab *fs;
char *chg[2], device[MAXPATHLEN];
struct ufs_args args;
struct statfs stfs;
argc--, argv++;
if (argc < 2)
usage();
special = argv[argc - 1];
fs = getfsfile(special);
if (fs)
special = fs->fs_spec;
if (fs) {
if (statfs(special, &stfs) == 0) {
if ((stfs.f_flags & MNT_RDONLY) == 0) {
errx(1, "cannot work on read-write mounted file system");
}
active = 1;
special = rawname(fs->fs_spec, device);
} else
special = fs->fs_spec;
}
again:
if (stat(special, &st) < 0) {
if (*special != '/') {
@ -245,6 +259,13 @@ main(argc, argv)
bwrite(fsbtodb(&sblock, cgsblock(&sblock, i)),
(char *)&sblock, SBSIZE);
close(fi);
if (active) {
bzero(&args, sizeof(args));
if (mount("ufs", fs->fs_file,
stfs.f_flags | MNT_UPDATE | MNT_RELOAD, &args) < 0)
err(9, "%s: reload", special);
warnx("file system reloaded");
}
exit(0);
}
@ -327,3 +348,25 @@ bread(bno, buf, cnt)
}
return (0);
}
char *
rawname(special, pathbuf)
char *special;
char *pathbuf;
{
char *p;
int n;
p = strrchr(special, '/');
if (p) {
n = ++p - special;
bcopy(special, pathbuf, n);
} else {
strcpy(pathbuf, _PATH_DEV);
n = strlen(pathbuf);
p = special;
}
pathbuf[n++] = 'r';
strcpy(pathbuf + n, p);
return pathbuf;
}