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Date:      Wed, 2 Oct 2002 12:29:16 +0200
From:      Pawel Jakub Dawidek <nick@garage.freebsd.pl>
To:        freebsd-hackers@freebsd.org
Subject:   Bug in nullfs?
Message-ID:  <20021002102916.GN19012@garage.freebsd.pl>
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[-- Attachment #1 --]
Hello hackers.

I have found something like this, but I'm not sure of this
is a bug in nullfs:

	# cd
	# mkdir dir1
	# mkdir dir1/dir2
	# mkdir dir3
	# mount_null dir1 dir3

Now simple proram "test":

-----[ start ]-----
#include <sys/param.h>
#include <sys/syscall.h>
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>

int
main(int argc, char *argv[])
{
	char	buf[MAXPATHLEN];

	/* I just want to be sure that I'm calling syscall directly. */
	if (syscall(SYS___getcwd, buf, sizeof buf) != 0) {
		fprintf(stderr, "%s: %s\n", argv[0], strerror(errno));
		exit(1);
	}
	printf("out: [%s]\n", buf);
	exit(0);
}
-----[ end ]-----

And now:

	# cd ~/dir3/dir1
	# /path/to/test
	/path/to/test: Not a directory

Problem is here (line 571 in /sys/kern/vfs_cache.c):

		if (vp->v_dd->v_id != vp->v_ddid) {
			numcwdfail1++;
			free(buf, M_TEMP);
			return (ENOTDIR);
		}

If "dir3" is for example NFS mount-point there are no problems.
Any ideas?

-- 
Pawel Jakub Dawidek
UNIX Systems Administrator
http://garage.freebsd.pl
Am I Evil? Yes, I Am.

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