From owner-freebsd-hackers  Wed Nov 13 15:43:48 2002
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Date: Thu, 14 Nov 2002 00:49:05 +0100
From: Pawel Jakub Dawidek <nick@garage.freebsd.pl>
To: Terry Lambert <tlambert2@mindspring.com>
Cc: freebsd-hackers@freebsd.org
Subject: Re: Shared files within a jail
Message-ID: <20021113234904.GM590@garage.freebsd.pl>
References: <20021113030847.69266.qmail@web12801.mail.yahoo.com> <20021113112325.GK590@garage.freebsd.pl> <3DD2E016.7862490@mindspring.com>
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On Wed, Nov 13, 2002 at 03:28:22PM -0800, Terry Lambert wrote:
+> Don't worry about it.  It's only a problem for mmap'ed files
+> which are also read/written.  Sheesh.

I have found one little bug in nullfs. I've send it some time ago
to hackers@, but without any respond.

Here it is, maybe someone could check it:

-----[ start mail ]-----
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) !=3D 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 !=3D vp->v_ddid) {
			numcwdfail1++;
			free(buf, M_TEMP);
			return (ENOTDIR);
		}

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

--=20
Pawel Jakub Dawidek
UNIX Systems Administrator
http://garage.freebsd.pl
Am I Evil? Yes, I Am.

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