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Date: Tue, 25 Aug 2020 02:54:28 +0100 From: Al Viro <viro@...iv.linux.org.uk> To: John Hubbard <jhubbard@...dia.com> Cc: Andrew Morton <akpm@...ux-foundation.org>, Christoph Hellwig <hch@...radead.org>, Ilya Dryomov <idryomov@...il.com>, Jens Axboe <axboe@...nel.dk>, Jeff Layton <jlayton@...nel.org>, linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org, ceph-devel@...r.kernel.org, linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 0/5] bio: Direct IO: convert to pin_user_pages_fast() On Fri, Aug 21, 2020 at 09:20:54PM -0700, John Hubbard wrote: > Direct IO behavior: > > ITER_IOVEC: > pin_user_pages_fast(); > break; > > ITER_KVEC: // already elevated page refcount, leave alone > ITER_BVEC: // already elevated page refcount, leave alone > ITER_PIPE: // just, no :) Why? What's wrong with splice to O_DIRECT file?
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