[ 3.5.yuz extended stable ] Patch "libceph: add some fine ASCII art" has been added to staging queue

[Herton Ronaldo Krzesinski]

This is a note to let you know that I have just added a patch titled

    libceph: add some fine ASCII art

to the linux-3.5.y-queue branch of the 3.5.yuz extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.yuz tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

>From 428536ee8852a698771baf69f68efdf02ea87b3b Mon Sep 17 00:00:00 2001
From: Alex Elder <elder at inktank.com>
Date: Wed, 20 Jun 2012 21:53:53 -0500
Subject: [PATCH 42/78] libceph: add some fine ASCII art

commit bc18f4b1c850ab355e38373fbb60fd28568d84b5 upstream.

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 at inktank.com>
Reviewed-by: Sage Weil <sage at inktank.com>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 net/ceph/messenger.c |   42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 64db2c2..dfc4192 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 */
--
1.7.9.5