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+.. SPDX-License-Identifier: GPL-2.0
+
+Global Structures
+=================
+
+The filesystem is sharded into a number of block groups, each of which
+have static metadata at fixed locations.
+
+.. include:: super.rst
+.. include:: group_descr.rst
+.. include:: bitmaps.rst
+.. include:: mmp.rst
+.. include:: journal.rst