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+======================
+ Library architecture
+======================
+
+Ceph is structured into libraries which are built and then combined together to
+make executables and other libraries.
+
+- libcommon: a collection of utilities which are available to nearly every ceph
+  library and executable. In general, libcommon should not contain global
+  variables, because it is intended to be linked into libraries such as
+  libcephfs.so.
+
+- libglobal: a collection of utilities focused on the needs of Ceph daemon
+  programs. In here you will find pidfile management functions, signal
+  handlers, and so forth.
+
+.. todo:: document other libraries
+