Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+.. _rados api:
+
+===========================
+ Ceph Storage Cluster APIs
+===========================
+
+The :term:`Ceph Storage Cluster` has a messaging layer protocol that enables
+clients to interact with a :term:`Ceph Monitor` and a :term:`Ceph OSD Daemon`.
+``librados`` provides this functionality to :term:`Ceph Client`\s in the form of
+a library.  All Ceph Clients either use ``librados`` or the same functionality
+encapsulated in ``librados`` to interact with the object store.  For example,
+``librbd`` and ``libcephfs`` leverage this functionality. You may use
+``librados`` to interact with Ceph directly (e.g., an application that talks to
+Ceph, your own interface to Ceph, etc.).
+
+
+.. toctree::
+   :maxdepth: 2 
+
+   Introduction to librados <librados-intro>
+   librados (C) <librados>
+   librados (C++) <libradospp>
+   librados (Python) <python>
+   libcephsqlite (SQLite) <libcephsqlite>
+   object class <objclass-sdk>