[Linux-cluster] Re: GFS

[Mark Fasheh <mark fasheh oracle com>]

On Wed, Aug 10, 2005 at 07:57:43PM +0300, Pekka J Enberg wrote:
> Surely avoiding them is preferred but how do you do that when you have to 
> mmap'd regions where userspace does memcpy()? The kernel won't much saying 
> in it until ->nopage. We cannot grab all the required locks in proper order 
> here because we don't know what size the buffer is. That's why I think lock 
> sorting won't work of all the cases and thus the problem needs to be taken 
> care of by the dlm. 
Hmm, well today in OCFS2 if you're not coming from read or write, the lock
is held only for the duration of ->nopage so I don't think we could get into
any deadlocks for that usage.
	--Mark

--
Mark Fasheh
Senior Software Developer, Oracle
mark fasheh oracle com