Commit bc18f4b1 authored by Alex Elder's avatar Alex Elder Committed by Sage Weil
Browse files

libceph: add some fine ASCII art 



Sage liked the state diagram I put in my commit description so
I'm putting it in with the code.

Signed-off-by: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarSage Weil <sage@inktank.com>
parent 5821bd8c

net/ceph/messenger.c

+41 −1
Original line number Diff line number Diff line
@@ -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 */