libceph: prepare for other message data item types
This just inserts some infrastructure in preparation for handling
other types of ceph message data items. No functional changes,
just trying to simplify review by separating out some noise.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index 1486243..716c3fd 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -97,8 +97,12 @@
struct ceph_msg_data_cursor {
bool last_piece; /* now at last piece of data item */
- struct page *page; /* current page in pagelist */
- size_t offset; /* pagelist bytes consumed */
+ union {
+ struct { /* pagelist */
+ struct page *page; /* page from list */
+ size_t offset; /* bytes from list */
+ };
+ };
};
struct ceph_msg_data {