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Re: [Linux-cluster] GFS bug with fcntl/flock ?



Hi Bob,

Was this the information you were looking for?  Short of writing my own, is there any test suite I can execute to test functionality?


On Wed, 2006-10-11 at 09:24 -0400, Robert Hurst wrote:
RHEL 4 U4 on dual AMD Opteron servers.  I don't believe this is an issue, but none of the Software Compatibility packages were installed either.  Thanks.

ClusterSuite:
ccs-1.0.7-0.src.rpm             ipvsadm-1.24-6.src.rpm
cman-1.0.11-0.src.rpm           magma-1.0.6-0.src.rpm
cman-kernel-2.6.9-45.5.src.rpm  magma-plugins-1.0.6-0.src.rpm
dlm-1.0.1-1.src.rpm             perl-Net-Telnet-3.03-3.noarch.rpm
dlm-kernel-2.6.9-42.13.src.rpm  piranha-0.8.2-1.src.rpm
fence-1.32.25-1.src.rpm         rgmanager-1.9.53-0.src.rpm
gulm-1.0.7-0.src.rpm            system-config-cluster-1.0.25-1.0.src.rpm
iddev-2.0.0-3.src.rpm

GFS:
GFS-6.1.6-1.src.rpm            gnbd-kernel-2.6.9-9.44.src.rpm
GFS-kernel-2.6.9-58.3.src.rpm  libsepol-devel-1.1.1-2.x86_64.rpm
gnbd-1.0.7-0.src.rpm           lvm2-cluster-2.02.06-7.0.RHEL4.src.rpm


On Wed, 2006-10-11 at 08:20 -0500, Robert Peterson wrote:
Robert Hurst wrote:
> I am running InterSystems Caché 5.0.19 for AMD64, and an strace output 
> from their utility reveals a problem with fcntl/flock on the GFS 
> filesystem (mount -t gfs /dev/VGSHARE/lvol0 /usr/local):
>
>     open("/usr/local/etc/cachesys/cache.reg", O_RDONLY|O_NONBLOCK) = 3
>     fcntl(3, F_SETLKW, {type=F_RDLCK, whence=SEEK_SET, start=0,
>     len=0}) = -1 ENOLCK (No locks available)
>
>
> When I put their files on an ordinary ext3 filesystem, all works fine:
>
>     open("/usr/local/etc/cachesys/cache.reg", O_RDONLY|O_NONBLOCK) = 3
>     fcntl(3, F_SETLKW, {type=F_RDLCK, whence=SEEK_SET, start=0,
>     len=0}) = 0
>
>
> The man page on fcntl states that when flock is setup with 
> whence=SEEK_SET, start=0, and len=0, the lock will occur on the entire 
> file... so locking zero bytes in this manner is acceptable.  Help?

Hi Robert,

What version of the cluster software and GFS are you using?

Regards,

Bob Peterson
Red Hat CLuster Suite

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