[PATCHES] namei cleanups

[Al Viro]

	Small namei.c patch series, mostly to simplify the rules
for nameidata state.  It's in #work.namei and it's actually from
the previous cycle - didn't post it for review in time...

	Changes visible outside of fs/namei.c: file_open_root()
calling conventions change, some freed bits in LOOKUP_... space.