Should be merged go into the previous patch. Also I just noticed how I misread ->mmap_validate in the first patch - it doesn't just validate the mmap arguments but also replaces ->mmap itself. Which means that a) the name for it is very confusing, and b) we should at very least have it fully replace ->mmap for file systems that implement it, that is ext4 and xfs should not have to implement both but just the new one.
