From: Erik Thiele <erik@thiele-hydraulik.de>
Subject: trouble with file locking
Date: Wed, 12 Nov 2003 10:50:43 +0100
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <20031112105043.020c1548.erik@thiele-hydraulik.de>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
To: nfs@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

Hi.

I am using as a fileserver

ii  nfs-kernel-ser 1.0-2woody1    Kernel NFS server support
ii  kernel-image-2 2.4.18-5       Linux kernel image for version 2.4.18 on AMD
ii  nfs-common     1.0-2woody1    NFS support files common to client and serve

on a AMD K6-2/400 with 128MB Ram.

the server has / mounted as ext2.

i am exporting to old hp-ux machines a subdirectory of / like this:

/Archiv xxx.unix.yyy-intern(rw,no_root_squash)

i also export my homedirectory to my linux woody debian machines like this:

/home/erik str.blafoo-intern(rw,no_root_squash)


i have written a test-program like this:

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

int main()
{
  int h=open("delmelockfile", O_WRONLY|O_CREAT, 0700);
  struct flock l;
  memset(&l,0,sizeof l);
  l.l_type=F_WRLCK;
  l.l_whence=SEEK_SET;
  l.l_start=0;
  l.l_len=0;
  fcntl(h,F_SETLK,&l);
  sleep(100);
  return 0;
}

i strace it, and it gets a no lock availiable error on the fcntl.
i use ethereal to analyze traffic and get a V4 LOCK CALL with the right inode,
and a V4 xxxxxx (i forgot to write) which has a NLM_DENIED or NLM_NO_LOCKS or something like that.

using rpcinfo i found nlockmgr running.
now if i restart the rpc.statd (!!!) suddenly it works and i get locks granted packages (NLM_GRANTED)

someone please enlighten me :)

cu
erik


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