Several patches that missed for-next (some - for more than
one cycle). This stuff is in
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #work.misc
and if nobody objects, to -next it goes. Not going to be rebased...
Individual patches in followups. Please, review.
3 descriptor-related cleanups, then a couple of patches
eliminating 'inode' argument of kernel_file_open() and
do_dentry_open() resp., then Miklos' removal of
call_{read,write}_iter() from back last August.
