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| author | Alex Elder <elder@inktank.com> | 2012-06-20 21:53:53 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-26 11:38:28 -0800 |
| commit | db90f992eb77188ce3e2b95d36f99ba194e04e66 (patch) | |
| tree | 9f3e121e70ae6fb8260db9c64b29b0f077b60465 /net/ceph | |
| parent | a8651271bb5d77402251bf35554d1f320463c949 (diff) | |
| download | kernel-common-db90f992eb77188ce3e2b95d36f99ba194e04e66.tar.gz kernel-common-db90f992eb77188ce3e2b95d36f99ba194e04e66.tar.bz2 kernel-common-db90f992eb77188ce3e2b95d36f99ba194e04e66.zip | |
libceph: add some fine ASCII art
(cherry picked from commit bc18f4b1c850ab355e38373fbb60fd28568d84b5)
Sage liked the state diagram I put in my commit description so
I'm putting it in with the code.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ceph')
| -rw-r--r-- | net/ceph/messenger.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 73e2ee847be2..c40d1d5b3048 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -29,7 +29,47 @@ * the sender. */ -/* State values for ceph_connection->sock_state; NEW is assumed to be 0 */ +/* + * We track the state of the socket on a given connection using + * values defined below. The transition to a new socket state is + * handled by a function which verifies we aren't coming from an + * unexpected state. + * + * -------- + * | NEW* | transient initial state + * -------- + * | con_sock_state_init() + * v + * ---------- + * | CLOSED | initialized, but no socket (and no + * ---------- TCP connection) + * ^ \ + * | \ con_sock_state_connecting() + * | ---------------------- + * | \ + * + con_sock_state_closed() \ + * |\ \ + * | \ \ + * | ----------- \ + * | | CLOSING | socket event; \ + * | ----------- await close \ + * | ^ | + * | | | + * | + con_sock_state_closing() | + * | / \ | + * | / --------------- | + * | / \ v + * | / -------------- + * | / -----------------| CONNECTING | socket created, TCP + * | | / -------------- connect initiated + * | | | con_sock_state_connected() + * | | v + * ------------- + * | CONNECTED | TCP connection established + * ------------- + * + * State values for ceph_connection->sock_state; NEW is assumed to be 0. + */ #define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ #define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ |