Re: [PATCH 3/6] block, fs: assert that key paths use iovecs, and nothing else
From: Al Viro <viro@zeniv.linux.org.uk>
Date: 2022-02-27 22:15:34
Also in:
linux-fsdevel, linux-mm, linux-xfs, lkml
On Sun, Feb 27, 2022 at 01:34:31AM -0800, jhubbard.send.patches@gmail.com wrote:
From: John Hubbard <jhubbard@nvidia.com> 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()?