Mount filesystems by UUID or label. (I'm not really sure if we can do
this at the moment but we ought to be able to do it, and perhaps make
-it easier by having a direct command).
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+it easier by having a direct command).
+
+Map filesystems to disk blocks
+------------------------------
+
+Map files/filesystems/(any other object) to the actual disk
+blocks they occupy.
+
+And vice versa.
+
+Is it even possible?