Series updated and force-pushed to the same place:
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git #work.d_revalidate
itself on top of #work.dcache.
Individual patches in followups; please, review.
Changes since v1:
* reordered external_name members to get rid of hole on 64bit, as suggested by
dhowells.
* split the added method in two in the last commit ("9p: fix ->rename_sem exclusion")
Folks, if no objections materialize, into #for-next it goes.
