>>>>> "Josef" == Josef Sipek <jsipek@xxxxxxxxxxxxxxxxx> writes:
Josef> That is an artifact of how the Linux VFS works. When you modify a
Josef> file though wrapfs (or any other stackable file system) the
Josef> wrapfs code gets called. It then calls the lower file system code
Josef> on your behalf. When you modify the lower file directly, ext3
Josef> gets the called, but since Linux has no way for this change to be
Josef> announced up the stack, wrapfs happily uses the old, cached
Josef> data. If you have ideas about how to solve this, please share
Josef> them - right now, there is a lot of work being done to get
Josef> Unionfs (ours) and eCryptfs into the vanilla linux kernel.
While constructed for a vnode system, the ideas in a set of
Ficus-related papers and theses could be helpful here. This is John
Heidemann's PhD thesis on the topic (covers necessary VM designs,
callbacks, etc.):
http://www.isi.edu/people/johnh/PAPERS/Heidemann95e.html
--
John Kohl
Senior Software Engineer - Rational Software - IBM Software Group
Lexington, Massachusetts, USA
jtk@xxxxxxxxxx
<http://www.ibm.com/software/rational/>
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