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The printcap update procedure involves the background printer process
obtaining the printcap information from the printing backend, writing
this to printer_list.tdb, and then notifying all smbd processes of the
new list. The processes then all attempt to simultaneously traverse
printer_list.tdb, in order to update their local share lists.
With a large number of printers, and a large number of per-client smbd
processes, this traversal results in significant lock contention, mostly
due to the fact that the traversal is unnecessarily done with an
exclusive (write) lock on the printer_list.tdb database.
This commit changes the share update code path to perform a read-only
traversal.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=10652
Reported-by: Alex K <korobkin+samba@gmail.com>
Reported-by: Franz Pförtsch <franz.pfoertsch@brose.com>
Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
printer_list_need_refresh() was used previously to ensure one smbd
process did not attempt to update the printer_list tdb during or soon
after update by another smbd.
It is no longer needed, as pcap updates are now only performed by the
parent smbd process following startup, SIGHUP, config update or printcap
cache time expiry.
