[Cluster-devel] Re: [PATCH][GFS2] - bz 272021: GFS2 - flocks from same process trip kernel BUG at fs/gfs2/glock.c:1118!

[Steven Whitehouse]

Hi,

Now in the -nmw git tree. Thanks,

Steve.

On Thu, 2007-09-13 at 23:35 -0500, Abhijith Das wrote:
> This patch adds a new flag to the gfs2_holder structure GL_FLOCK. 
> It is set on holders of glocks representing flocks. This flag is 
> checked in add_to_queue() and a process is permitted to queue more 
> than one holder onto a glock if it is set. This solves the issue 
> of a process not being able to do multiple flocks on the same file. 
> Through a single descriptor, a process can now promote and demote 
> flocks. Through multiple descriptors a process can now queue 
> multiple flocks on the same file. There's still the problem of 
> a process deadlocking itself (because gfs2 blocking locks are not 
> interruptible) by queueing incompatible deadlock.
> 
> Signed-off-by: Abhijith Das <adas at redhat.com>
>