Ideas on using locking.tdb from Netatalk to implement combined share mode database

Frank Lahm franklahm at googlemail.com
Wed Feb 23 12:51:03 MST 2011


2011/2/23 Jeremy Allison <jra at samba.org>:
> On Wed, Feb 23, 2011 at 08:24:52PM +0100, Frank Lahm wrote:
>> 2011/2/23 Jeremy Allison <jra at samba.org>:
>> > On Wed, Feb 23, 2011 at 04:06:00PM +0100, Frank Lahm wrote:
>> >> Dear hackers,
>> >>
>> >> I'm in the process of a decent rewrite of certain Netatalk (Opensource
>> >> AFP filserver) subsystems. One of them is acess/deny mode subsytem
>> >> which is the AFP pendant to share modes in CIFS. We're currently
>> >> storing these as brls -- an ancient but working hack.
>> >>
>> >> I'm now about to rewrite this stuff to use a tbd database. In order to
>> >> have a fully spec conforming cross-platform server (Samba for Win
>> >> clients, Netatlak for AFP clients) it would be necessary to integrate
>> >> both sytems.
>> >>
>> >> So I went ahead poking around in source3, hoping I could find a way where
>> >> - Netatalk's afpd processes would be able to use Samba's locking.tdb
>> >> (if configured to do so)
>> >>
>> >> I've found "include/smb_share_modes.h" and libsmbsharemodes which look
>> >> promising.
>> >>
>> >> Semantic differences [1] let aside for now, could this approach work out!
>> >
>> > libsmbsharemodes was designed for exactly this purpose and used
>> > by the NetWare file sharing daemon code on Linux.
>>
>> Great!
>>
>> >
>> > Let me know if it will work for you - changes and updates
>> > are welcome !
>>
>> How is cleanup in case of eg a crash supposed to happen? There's no
>> way to go through the locks by pid, deleting any lock for which the
>> process is gone, is there?
>> Or is such cleanup builtin ?
>
> smbd has this cleanup builtin. It's not built into the libsmbsharemodes
> api.

So this cleanup has to be build into afpd, but for that ideally there
should be an API in "smb_share_modes.h". Until that happens, any
pointer how I could manually do the cleanup in afpd ?

Thanks!
-f


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