libceph: have messages point to their connection

When a ceph message is queued for sending it is placed on a list of
pending messages (ceph_connection->out_queue).  When they are
actually sent over the wire, they are moved from that list to
another (ceph_connection->out_sent).  When acknowledgement for the
message is received, it is removed from the sent messages list.

During that entire time the message is "in the possession" of a
single ceph connection.  Keep track of that connection in the
message.  This will be used in the next patch (and is a helpful
bit of information for debugging anyway).

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index dd27837f79ac..6df837f72761 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -77,7 +77,10 @@ struct ceph_msg {
         unsigned nr_pages;              /* size of page array */
         unsigned page_alignment;        /* io offset in first page */
         struct ceph_pagelist *pagelist; /* instead of pages */
+
+        struct ceph_connection *con;
         struct list_head list_head;
+
         struct kref kref;
         struct bio  *bio;               /* instead of pages/pagelist */
         struct bio  *bio_iter;          /* bio iterator */