more streams work

[Volker Lendecke]

On Sun, Jan 20, 2008 at 09:05:26AM -0800, James Peach wrote:
> When you have stored stream data in an xattr, do you want that to be  
> visible to the xattr or EA APIs?

Ok, understood. This was on my agenda, now checked in with
e9bb3d5067.
 
> I darwin_streams, I split the xattr list into 2 namespaces. If the  
> first character of the xattr name was ':', it was a stream, otherwise  
> it was just a regular xattr. This prevents the streaminfo call  
> returning xattrs that do not hold streams data, and it prevents the EA  
> and xattr APIs returning xattrs that do hold streams data.

Well, I'm using a slightly different approach. All streams
are stored as xattrs with user.DosStream.<streamname>, very
similar to the Samba4 approach. Samba4 has one more
attribute that lists all streams with their allocation
sizes. This is probably the more correct way, but I think
with calculating the allocation size on demand we're close
enough.

Volker
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