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Message-ID: <Yhv39J4+FwD/B2aJ@zeniv-ca.linux.org.uk> Date: Sun, 27 Feb 2022 22:15:16 +0000 From: Al Viro <viro@...iv.linux.org.uk> To: jhubbard.send.patches@...il.com Cc: Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@...radead.org>, Dave Chinner <dchinner@...hat.com>, "Darrick J . Wong" <djwong@...nel.org>, Theodore Ts'o <tytso@....edu>, Miklos Szeredi <miklos@...redi.hu>, Andrew Morton <akpm@...ux-foundation.org>, Chaitanya Kulkarni <kch@...dia.com>, linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org, linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>, John Hubbard <jhubbard@...dia.com> Subject: Re: [PATCH 3/6] block, fs: assert that key paths use iovecs, and nothing else On Sun, Feb 27, 2022 at 01:34:31AM -0800, jhubbard.send.patches@...il.com wrote: > From: John Hubbard <jhubbard@...dia.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()?
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