Hi folks,

Here is my first version of using file semantics in shared
memory. This obsoletes vm_private_data in vm_area_struct and allows
posix shared memory.

I implemented posix shm with its own namespace by extending filp_open
and do_unlink by an additional parameter for the root inode.

Also extending this to a complete filesystem should be easy (but not
my target).

Greetings
		Christoph

P.S. this version is only tested on UP since I cannot access my SMP machine
     from home. I will stress test SMP next week.