libceph: implement pages array cursor

Implement and use cursor routines for page array message data items
for outbound message data.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
index 76b4645e2dff..b53b9ef65009 100644
--- a/include/linux/ceph/messenger.h
+++ b/include/linux/ceph/messenger.h
@@ -105,6 +105,12 @@ struct ceph_msg_data_cursor {
                         unsigned int    vector_offset;  /* bytes from vector */
                 };
 #endif /* CONFIG_BLOCK */
+                struct {                                /* pages */
+                        size_t          resid;          /* bytes from array */
+                        unsigned int    page_offset;    /* offset in page */
+                        unsigned short  page_index;     /* index in array */
+                        unsigned short  page_count;     /* pages in array */
+                };
                 struct {                                /* pagelist */
                         struct page     *page;          /* page from list */
                         size_t          offset;         /* bytes from list */