linux-kernel - Re: GFS2 file locking issues

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Date:	Wed, 11 Feb 2009 17:37:11 +0300
From:	Kirill Kuvaldin <kirill.kuvaldin@...il.com>
To:	steve@...gwyn.com
Cc:	linux-cluster@...hat.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: GFS2 file locking issues

On Wed, Feb 11, 2009 at 4:36 PM,  <steve@...gwyn.com> wrote:
> Hi,
>
> On Wed, Feb 11, 2009 at 01:55:08PM +0300, Kirill Kuvaldin wrote:
>> Hi,
>>
>> I'm trying to understand how the FS locking mechanism should work.
>>
>> I'm running a clustered GFS2 across two nodes, each node is a Xen domU.
>> To check if locking works correctly I wrote the simple perl script below.
>> Basically the script opens a file, locks it to prevent others from
>> writing into it, writes 20 lines into it, then unlocks and closes.
>>i
>
> It should be exactly the same on GFS and GFS2, after all the code for
> flock is almost identical between the two. What mount options did you
> use?

No specific options used, just mount -t gfs2 /dev/gfsc/lvol0 /gfs2...

> Which lock manager are you using - I presume lock_dlm?
>

Yes, the FS was created using to be used with lock_dlm. I'm not sure
if it is actually used for GFS2. How can I check that?

Kirill
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