From: Alex Elder <elder@inktank.com>
Date: Tue, 12 Mar 2013 04:34:24 +0000 (-0500)
Subject: libceph: make message data be a pointer
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~26^2~162
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6644ed7b7e04f8e588aebdaa58cededb9416ab95;p=pandora-kernel.git

libceph: make message data be a pointer

Begin the transition from a single message data item to a list of
them by replacing the "data" structure in a message with a pointer
to a ceph_msg_data structure.

A null pointer will indicate the message has no data; replace the
use of ceph_msg_has_data() with a simple check for a null pointer.

Create functions ceph_msg_data_create() and ceph_msg_data_destroy()
to dynamically allocate and free a data item structure of a given type.

When a message has its data item "set," allocate one of these to
hold the data description, and free it when the last reference to
the message is dropped.

This partially resolves:
    http://tracker.ceph.com/issues/4429

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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