Import sources from 2011-03-30 iso image

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diff --git a/sys/src/cmd/cfs/notes b/sys/src/cmd/cfs/notes
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+- virtual directories, reading a directory wipes out the
+ virtual directory. virtual property in the inode.
+
+- inode contains the qid, inuse, pointers, and virtual
+ property.  one pointer each for 3 levels.
+
+? reserve version == -1 to mean a virtual file? makes
+ some things easier.
+
+- first inode is always the root.
+
+- adding any virtual entry to a directory makes the
+ whole directory virtual.
+
+? how do we keep cfs from swapping?
+
+? how do we resolve access to missing parts when running
+ remotely?
+
+? what are default properties of files (ones we haven't
+ stat'd)?