From: Ruben Puettmann <ruben@puettmann.net>
Subject: 2.6.X File locking on NFS stil broken
Date: Wed, 9 Jun 2004 21:17:58 +0200
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                hello,


I have a big iproblem with the nfs file locking on some 2.6 er kernel 

Kernel Server: 2.4.9
Kernel Client: 2.6.7-rc3-bk2
               2.6.6-rc3-mm2
               2.6.5

mount options :

10.0.0.149:/export     /mnt/server      nfs rw,auto,soft,bg,timeo=12,retrans=3,in tr,rsize=8192,wsize=8192,mountvers=3,nfsvers=3,udp  0  0

nfs-utils :  1.0.6

Both Server an Client Debian Sarge. Wiht kernel 2.4.21-pre5 the locking
runs very fine against the server.

This little testscript I  used ( got it from a friend):

#define _GNU_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>

int main(int c, char **v)
{
    for (++v, --c; c--; ++v) {
        struct flock lck = {F_RDLCK, SEEK_SET, 0, 0}; /* whole file */
        int fd = open(*v, O_RDONLY);
        if ( fd < 0 )
            fprintf(stderr, "%s: %s\n", *v, strerror(errno));
        else {
            if ( fcntl(fd, F_SETLK, &lck) < 0 )
                fprintf(stderr, "%s[%d]: %s\n", *v, lck.l_pid, strerror(errno));
            else
                printf("%s..ok\n", *v);
            close(fd);
        }
    }
    return 0;
}


The programm hangs after executing ./script testfile. 


                        Ruben





-- 
Ruben Puettmann
ruben@puettmann.net
http://www.puettmann.net