samba - Jul 2008 - Setting (exposing) FILE_ATTRIBUTE_OFFLINE for a share

Hi all,

Back in 2002 I opened a discussion on the samba-technical mailing list
regarding the WinNT FILE_ATTRIBUTE_OFFLINE (
http://lists.samba.org/archive/samba-technical/2002-April/020969.html).

Meanwhile some FILE_ATTRIBUTE_OFFLINE handling was implemented in the
'trunk' Samba. Currently (Samba 3.0.28a-1ubuntu4.4) provides the
'dmapi
support' option for representing the mentioned attribute. Unfortunately it
seems the option is supported only on XFS using the libdm0. Additionally it
seems only SUSE / SLES ships with the mentioned support built into Samba.

Well ... I'm again interested in the mentioned option and I'm wondering
if
there is a way to say 'add the FILE_ATTRIBUTE_OFFLINE flag' for all
files in
the specified share.
Of course it would be even better if I could implement a utility / dmapi
interface / or something else Samba could use to figure out which files I
would like to mark as offline on the HSM file system I'm using or any other
kernel / FUSE / ... file system.

I know it is not a big deal changing the Samba code; however, I would really
like avoiding building a custom Samba package for every machine our HSM
product is running on.

Thanks in advance and best regards,
Damir Dezeljin

PS: Let me know if you think it would be better to re-post the question on
samba-technical.

On Thu, Jul 31, 2008 at 11:25:09AM +0200, Damir Dezeljin
wrote:
> Hi all,
> 
> Back in 2002 I opened a discussion on the samba-technical mailing list
> regarding the WinNT FILE_ATTRIBUTE_OFFLINE (
> http://lists.samba.org/archive/samba-technical/2002-April/020969.html).
> 
> Meanwhile some FILE_ATTRIBUTE_OFFLINE handling was implemented in the
> 'trunk' Samba. Currently (Samba 3.0.28a-1ubuntu4.4) provides the
'dmapi
> support' option for representing the mentioned attribute. Unfortunately
it
> seems the option is supported only on XFS using the libdm0. Additionally it
> seems only SUSE / SLES ships with the mentioned support built into Samba.
> 
> Well ... I'm again interested in the mentioned option and I'm
wondering if
> there is a way to say 'add the FILE_ATTRIBUTE_OFFLINE flag' for all
files in
> the specified share.
> Of course it would be even better if I could implement a utility / dmapi
> interface / or something else Samba could use to figure out which files I
> would like to mark as offline on the HSM file system I'm using or any
other
> kernel / FUSE / ... file system.
You might want to look at Samba 3.2: There we have a
is_offline VFS operation, and it would be trivial to add a
module that always returns true.

Volker
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