Tags · systemd/linux

This repository was archived by the owner on Aug 10, 2021. It is now read-only.

for-greg

kdbus updates for Greg

 * Drop unused features. This includes KDBUS_MSG_MAX_ITEMS, required attach
   flags on buses and filtering oneself on broadcasts. Those were all unused
   and I haven't seen any code using them now. As there is no need for them,
   drop support for them.
   We do _not_ break ABI, so old code still works. But we lack support for
   those features now. If anything turns up, we might have to revert these.
   But I really doubt that.

 * Namespaces are now pinned on kdbus_conn. This was triggered by a discussion
   with Eric regarding UDS on LKML:
   http://www.spinics.net/lists/netdev/msg329322.html
   We now follow the suggestion of Eric and pin namespaces. See the commit
   message of c2bc012 for details.

 * Full rewrite of the message importer (parsing user-passed message and
   prep'ing it before copying into the target pool). This was done to reduce
   the number of calls into shmem, as those showed up a lot on benchmarks.
   This rewrite makes up most of this PR and reduces overhead of message
   transactions by roughly 40%. More optimizations are underway.

 * We now support MATCH rules on the destination ID. This is supported by dbus1
   but we never really needed it. But as it turns out, the bus-proxy now needs
   it to support unicast-signal-compatibility with dbus1.

 * We now extended the metadata retrieval to support the discussed /proc-style
   access restrictions. This basically makes sure that we only transmit
   metadata that was explicitly allowed by the sender, or which the receiver
   has _actual_ access to via procfs of its own pid-namespace.

 * Miscellaneous fixes and cleanups (from mailing-list and myself).