Date: Tue, 27 Mar 2001 02:18:53 -0800 (PST) From: j.schripsema@kpn.com To: freebsd-gnats-submit@FreeBSD.org Subject: kern/26142: Unlink fails on NFS mounted filesystem Message-ID: <200103271018.f2RAIr213382@freefall.freebsd.org>
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>Number: 26142
>Category: kern
>Synopsis: Unlink fails on NFS mounted filesystem
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Mar 27 02:30:04 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: Jakob Schripsema
>Release: 4.2-RELEASE
>Organization:
KPN
>Environment:
client: FreeBSD nfsclient 4.2-RELEASE FreeBSD 4.2-RELEASE #0: Mon Nov 20 13:02:55 GMT 2000 jkh@bento.FreeBSD.org:/usr/src/sys/compile/GENERIC i386
server: FreeBSD nfsserver 4.2-RELEASE FreeBSD 4.2-RELEASE #0: Mon Nov 20 13:02:55 GMT 2000 jkh@bento.FreeBSD.org:/usr/src/sys/compile/GENERIC i386
>Description:
When removing all files in a large NFS mounted directory by calling
readdir and unlink repeatedly files get skipped.
It seems that this problem is related to problem kern/3381.
I ran into this problem when running bonnie++ (www.cooker.com.au/bonnie++)
on a NFS mounted filesystem.
>How-To-Repeat:
Run the attached program on the client. Uncomment the rewinddir call
first.
---- snip -----
#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);
}
/* Workaround */
/* rewinddir(dirp); */
/* End workaround */
}
}
>Fix:
Call rewinddir after each unlink call. I consider this a workaround,
not a fix.
>Release-Note:
>Audit-Trail:
>Unformatted:
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