libceph: define new ceph_file_layout structure

Define new ceph_file_layout structure and rename old ceph_file_layout
to ceph_file_layout_legacy. This is preparation for adding namespace
to ceph_file_layout structure.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 8946959..23efcac 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -932,7 +932,7 @@
 	if (opcode == CEPH_OSD_OP_CREATE || opcode == CEPH_OSD_OP_DELETE) {
 		osd_req_op_init(req, which, opcode, 0);
 	} else {
-		u32 object_size = le32_to_cpu(layout->fl_object_size);
+		u32 object_size = layout->object_size;
 		u32 object_base = off - objoff;
 		if (!(truncate_seq == 1 && truncate_size == -1ULL)) {
 			if (truncate_size <= object_base) {
@@ -948,7 +948,7 @@
 	}
 
 	req->r_flags = flags;
-	req->r_base_oloc.pool = ceph_file_layout_pg_pool(*layout);
+	req->r_base_oloc.pool = layout->pool_id;
 	ceph_oid_printf(&req->r_base_oid, "%llx.%08llx", vino.ino, objnum);
 
 	req->r_snapid = vino.snap;