Re: [PATCH 3/6] block, fs: assert that key paths use iovecs, and nothing else

[Al Viro]

On Sun, Feb 27, 2022 at 01:34:31AM -0800, jhubbard.send.patches@xxxxxxxxx wrote:
> From: John Hubbard <jhubbard@xxxxxxxxxx>
> 
> Upcoming changes to Direct IO will change it from acquiring pages via
> get_user_pages_fast(), to calling pin_user_pages_fast() instead.
> 
> Place a few assertions at key points, that the pages are IOVEC (user
> pages), to enforce the assumptions that there are no kernel or pipe or
> other odd variations being passed.

Umm...  And what should happen when O_DIRECT file gets passed to splice()?