- Massive internal locking changes to mft record locking. Fixes lock
  recursion and replaces the mrec_lock read/write semaphore with a
  mutex. Also removes the now superfluous mft_count. This fixes several
  race conditions and deadlocks, especially in the future write code.
- Fix ntfs over loopback for compressed files by adding an
  optimization barrier. (gcc was screwing up otherwise ?)
- Miscellaneous cleanups all over the code and a fix or two in error
  handling code paths.
Thanks go to Christoph Hellwig for pointing out the following two:
- Remove now unused function fs/ntfs/malloc.h::vmalloc_nofs().
- Fix ntfs_free() for ia64 and parisc by checking for VMALLOC_END, too.