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Since commit 7022554, smbds share a printcap cache (printer_list.tdb),
therefore ordering of events between smbd processes is important when
updating printcap cache information. Consider the following two process
example:
1) smbd1 receives HUP or printcap cache time expiry
2) smbd1 checks whether pcap needs refresh, it does
3) smbd1 marks pcap as refreshed
4) smbd1 forks child1 to obtain cups printer info
5) smbd2 receives HUP or printcap cache time expiry
6) smbd2 checks whether pcap needs refresh, it does not (due to step 3)
7) smbd2 reloads printer shares prior to child1 completion (stale pcap)
8) child1 completion, pcap cache (printer_list.tdb) is updated by smbd1
9) smbd1 reloads printer shares based on new pcap information
In this case both smbd1 and smbd2 are reliant on the pcap update
performed on child1 completion.
The prior commit "reload shares after pcap cache fill" ensures that
smbd1 only reloads printer shares following pcap update, however smbd2
continues to present shares based on stale pcap data.
This commit addresses the above problem by driving pcap cache and
printer share updates from the parent smbd process.
1) smbd0 (parent) receives a HUP or printcap cache time expiry
2) smbd0 forks child0 to obtain cups printer info
3) child0 completion, pcap cache (printer_list.tdb) is updated by smbd0
4) smbd0 reloads printer shares
5) smbd0 notifies child smbds of pcap update via message_send_all()
6) child smbds read fresh pcap data and reload printer shares
This architecture has the additional advantage that only a single
process (the parent smbd) requests printer information from the printcap
backend.
Use time_mono in housekeeping functions As suggested by Björn Jacke.
Since commit eada8f8a, updates to the cups pcap cache are performed
asynchronously - cups_cache_reload() forks a child process to request
cups printer information and notify the parent smbd on completion.
Currently printer shares are reloaded immediately following the call to
cups_cache_reload(), this occurs prior to smbd receiving new cups pcap
information from the child process. Such behaviour can result in stale
print shares as outlined in bug 7836.
This fix ensures print shares are only reloaded after new pcap data has
been received.
Pair-Programmed-With: Lars Müller <lars@samba.org>
nmbd --port didn't work
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User: Stefan Metzmacher <metze@samba.org>
Autobuild-Date: Fri Jan 7 17:44:08 CET 2011 on sn-devel-104
This does an async port 137 transaction: It connects to /tmp/.nmbd/unexpected,
sends out the query and then waits for a reply on both the socket as well as
data from /tmp/.nmbd/unexpected. Every packet is passed through a validator. If
that returns true, the packet received is finally accepted.
This provides the framework to replace the unexpected.tdb file. Nmbd will
listen on /tmp/.nmbd/unexpected. A client interested in unexpected packets
connects there. It sends a nb_packet_query plus a potential mailslot name for
dgram packets. It waits for a single ack byte to avoid races. After that has
happened, nmbd will pass down all matching packets through that socket.
nb_packet_server_create and nb_packet_dispatch are the nmbd routines,
nb_packet_reader_send/recv and nb_packet_read_send/recv are the client ones.
Also remove duplicates and sort the tables.
Still not sure if I understand the reason of processing the flags table after
the diroptions table, as every option you give it via configure was overwritten
immediately.
Guenther
Autobuild-User: Günther Deschner <gd@samba.org>
Autobuild-Date: Fri Jan 7 00:57:10 CET 2011 on sn-devel-104
Initial patch from Patrik Martinsson <patrik.martinsson@smhi.se>.
Guenther
Autobuild-User: Günther Deschner <gd@samba.org>
Autobuild-Date: Thu Jan 6 17:29:11 CET 2011 on sn-devel-104
