[Ocfs2-users] php flock function and ocfs2?

[Stephan Hendl]

in the cluster docu I found:

Caveats
=======
Features which OCFS2 does not support yet:
        - extended attributes
        - readonly mount
        - shared writeable mmap
        - loopback is supported, but data written will not
          be cluster coherent.
        - quotas
        - cluster aware flock   <----------------------------------------
        - Directory change notification (F_NOTIFY)
        - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
        - POSIX ACLs
        - readpages / writepages (not user visible)

Could this be the reason and when yes will it be implemented in the near future?

Stephan

>>> "Stephan Hendl" <Stephan.Hendl at lds.brandenburg.de> schrieb am 21.05.2007 um
15:30 in Nachricht <4651BB2A.4F9C.0016.0 at lds.brandenburg.de>:
> Hi all,
> 
> does anybody have experiences with php flock funktion and ocfs2 clusters? 
> flock is described in http://php.net/flock . The following text is outlined 
> by the developers:
> 
> -------- snip --------
> flock() will not work on NFS and many other networked file systems. Check 
> your operating system documentation for more details.
> 
> On some operating systems flock() is implemented at the process level. When 
> using a multithreaded server API like ISAPI you may not be able to rely on 
> flock() to protect files against other PHP scripts running in parallel 
> threads of the same server instance! 
> -------- snip --------
> 
> OS is CentOS 4.4, latest kernel (2.6.9-42.0.10ELsmp) and latest rpm package 
> from ocfs2.
> 
> Could it be that there are interactions between the two locking mechanism of 
> php and ocfs2?
> 
> Stephan
> 
> 
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