VFS to NTFS transition
jpeach at samba.org
Mon Apr 28 16:35:34 GMT 2008
On Apr 25, 2008, at 10:43 AM, Ralph Böhme wrote:
> thank you for you detailed description. Before I reply with a
> description of what I have in mind regarding netatalk<->samba
> interop I have some comments and questions:
> Am 24.04.2008 um 15:03 schrieb Shlomi Yaakobovich:
>> In Exanet we use a modified vfs_netatalk object. We call it
>> vfs_ads. It
>> includes possible some of the enhancements you are referring to.
>> As you might know, the vfs_netatalk code is compatible with the
>> adouble:v1 format. In short, this format saves Macintosh Resource
>> under the .AppleDouble folder. Our older tests using this format were
>> quite ok, we used it for quite some time.
> If I am not totally missing something the code it is also compatible
> with adouble:v2 format which is what netatalk 2 is actually using to
> store the Mac metadata as well as some private data: it is
> compatible because it does nothing more than hide and delete adouble
> extra files if the corresponding (data fork) file is moved (or
> deleted) through Samba.
>> However, we wanted to increase interoperability, and we discovered
>> Microsoft treats Resource Forks the same way it handles Resource
>> The first stage was to develop the adouble:ads format, and also
>> vfs_netatalk to vfs_ads. The new functionality now saves the
>> Data Streams in the same directory as the Macintsh Resource forks.
>> Moreover, all operations by either Mac or Windows clients (e.g.
>> delete etc.) are performed well on files with whichever attached
>> Resource Fork or Aletrnate Data streams.
>> Later work was designed to allow Windows clients/application actual
>> access to the data inside the resource fork, for example in order to
>> show the icon of the picture. This lead to the development of the
>> adouble:sfm format in netatalk and to the appropriate changes in
>> vfs_ads. Resource Forks are separated into two files in this format:
>> AFP_Resource and AFP_AfpInfo. This has its side effects, but does
>> the required interoperability.
> So on the netatalk side: what is the functional difference between
> adouble:v2 and your adouble:sfm? Why didn't you just work with
> Just asking out of curiosity and in order to fully undestand your
>> We can share the code of course, it is GPL after all ! But the
>> code has
>> changed quite much from the vfs_netatalk, and does not compile
>> our changes to samba (which I am not sure you want). However, it is
>> our best interest that our changes will eventually come back to the
>> samba code. I would like to know exactly which changes you have had
>> mind, ...
> All operations by either Mac or Windows clients (e.g. rename, delete
> etc.) shall be performed well on basis of the current netatalk
> adouble:v2 implementation. Most importantly vfs_netatalk must copy
> and move adouble:v2 files upon SMB copy/move actions.
> This and any further anhancemnet is done with the following
> assumptions in mind:
> - primary filing protocol for Macs is AFP -- CIFS for Macs is
> considered a bad idea in this setup
> - it is unecessary that SMB clients access Mac metadata or ressource
> forks (as you are doing -- which applications actually make use of
These two assumptions are bogus. The 10.5 smbfs client does natively
propagate Mac metadata and resource forks across SMB. It provides a
user experience that is virtually indistinguishable from AFP. If the
SMB server can't support support these, then the client will fall back
to using ._ files.
> - Windows alternate data streams are stored wherever the current
> Samba implementation and configuration likes to store it, thats a
> totally different mapping
More information about the samba-technical