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Merge tag 'rxrpc-rewrite-20160622-2' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
David Howells says:
====================
rxrpc: Get rid of conn bundle and transport structs
Here's the next part of the AF_RXRPC rewrite. The primary purpose of this
set is to get rid of the rxrpc_conn_bundle and rxrpc_transport structs.
This simplifies things for future development of the connection handling.
To this end, the following significant changes are made:
(1) The rxrpc_connection struct is given pointers to the local and peer
endpoints, inside the rxrpc_conn_parameters struct. Pointers to the
transport's copy of these pointers are then redirected to the
connection struct.
(2) Exclusive connection handling is fixed. Exclusive connections should
do just one call and then be retired. They are used in security
negotiations and, I believe, the idea is to avoid reuse of negotiated
security contexts.
The current code is doing a single connection per socket and doing all
the calls over that. With this change it gets a new connection for
each call made.
(3) A new sendmsg() control message marker is added to make individual
calls operate over exclusive connections. This should be used in
future in preference to the sockopt that marks a socket as "exclusive
connection".
(4) IDs for client connections initiated by a machine are now allocated
from a global pool using the IDR facility and are unique across all
client connections, no matter their destination. The IDR facility is
then used to look up a connection on the connection ID alone. Other
parameters are then verified afterwards.
Note that the IDR facility may use a lot of memory if the IDs it holds
are widely scattered. Given this, in a future commit, client
connections will be retired if they are more than a certain distance
from the last ID allocated.
The client epoch is advanced by 1 each time the client ID counter
wraps. Connections outside the current epoch will also be retired in
a future commit.
(5) The connection bundle concept is removed and the client connection
tree is moved into the local endpoint. The queue for waiting for a
call channel is moved to the rxrpc_connection struct as there can only
be one connection for any particular key going to any particular peer
now.
(6) The rxrpc_transport struct is removed and the service connection tree
is moved into the peer struct.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
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