libceph: replace message data pointer with list

In place of the message data pointer, use a list head which links
through message data items.  For now we only support a single entry
on that list.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index 8846ff610502..318da0170a1e 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -89,6 +89,7 @@ static __inline__ bool ceph_msg_data_type_valid(enum ceph_msg_data_type type)
 }
 
 struct ceph_msg_data {
+        struct list_head                links;  /* ceph_msg->data */
         enum ceph_msg_data_type         type;
         union {
 #ifdef CONFIG_BLOCK
@@ -143,7 +144,7 @@ struct ceph_msg {
         struct ceph_buffer *middle;
 
         size_t                          data_length;
-        struct ceph_msg_data            *data;
+        struct list_head                data;
         struct ceph_msg_data_cursor     cursor;
 
         struct ceph_connection *con;