From owner-freebsd-hackers  Fri Mar 23  2:22:42 2001
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Message-ID: <F16EB3CA3CD6D211893C0000F81AF4A542D946@gn007v3>
From: j.schripsema@kpn.com
To: freebsd-hackers@freebsd.org
Subject: NFS: "got bad cookie" error (again?)
Date: Fri, 23 Mar 2001 11:21:55 +0100
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Hello,

Running bonnie++ on a NFS mounted files system doesn't work. Bonnie exits
with a fatal error caused by an attempt to remove a non-empty directory.
Bonnie tries to remove all files in a directory by calling 'readdir' an
'unlink' in a loop. This works fine on a local filesystem (UFS) but not on a
NFS mounted filesystem (also UFS on the server).

I'm running FreeBSD 4.2-RELEASE on both the nfs-server and nfs-client. I
have used several NFS configs (v2/v3).

I have seen references to this problem in old archives (1997, FBSD 2.2.5/6),
but it seems the problem has never been fixed. Is this correct? I even read
the manual :-( but could not find a solution.

Below you will find a small program that reveals the problem, including a
fix., which I do not like, because it requires a change in user programs.

Regards,

Jakob Schripsema
sch@kpn.com

-------------------------------


#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <dirent.h>


#define	BASEDIR	"/FS/testdir"		/* NFS mounted	*/
#define	NFILES	1024

main()
{
	create_files();
	delete_files();
}

create_files()
{
	int i,fd;
	char buf[2048];

	for(i = 0 ; i < NFILES ; i++) {
		snprintf(buf,2048,"%s/%04d",BASEDIR,i);
		if ((fd = open(buf,O_CREAT | O_TRUNC | O_WRONLY, 0644)) < 0)
{
			perror(buf);
			return(-1);
		}
		close(fd);
	}
}

delete_files()
{
	DIR *dirp;
	struct dirent *dp;
	char buf[2048];

	if ((dirp = opendir(BASEDIR)) == NULL) {
		perror("opendir");
		return (-1);
	}
	while ((dp = readdir(dirp)) != NULL) {
		if (dp->d_name[0] == '.')
			continue;
		snprintf(buf,2048,"%s/%s",BASEDIR,dp->d_name);
		fprintf(stderr,"%s\n",buf);
		if (unlink(buf) < 0) {
			perror(buf);
			return (-1);
		}
		/* This fixes the problem */
		rewinddir(dirp);
		/* End fix */
	}
}

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