Locking over NFS

* Locking over NFS
@ 2003-11-27 23:09 J.A. Magallon
  2003-11-28  1:01 ` Trond Myklebust
  0 siblings, 1 reply; 3+ messages in thread
From: J.A. Magallon @ 2003-11-27 23:09 UTC (permalink / raw)
  To: Lista Linux-Kernel

Hi all...

Is locking via lockf/fcntl supposed to work over NFS mounted volumes 
in 2.4 ?
I can't get it to work, even if kernel [lockd] is running in the server.
Server locks the file, and client gets an error:

annwn:~/dev/lk> lockf 10000
locked
<switch term>
annwn:~/dev/lk> bpsh 0 lockf
lockf:F_LOCK: No locks available

lockf.c:

#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>

int main(int argc, char** argv)
{
    int fd;

    fd = open("lock",O_RDWR);
    if (fd<0)
        perror("open");

    if (lockf(fd,F_LOCK,0)<0)
        perror("lockf:F_LOCK");
    else
        printf("locked\n");
    fflush(stdout);

    if (argc>1)
        sleep(atoi(argv[1]));

    if (lockf(fd,F_ULOCK,0)<0)
        perror("lockf:F_ULOCK");
    else
        printf("unlocked\n");
    fflush(stdout);

    return 0;
}

TIA

-- 
J.A. Magallon <jamagallon()able!es>     \                 Software is like sex:
werewolf!able!es                         \           It's better when it's free
Mandrake Linux release 10.0 (Cooker) for i586
Linux 2.4.23-rc5-jam1 (gcc 3.3.1 (Mandrake Linux 9.2 3.3.1-4mdk))

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