linux-kernel - Re: [PATCH v7 2/8] iov_iter: Add a function to extract a page list from an iterator

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Date:   Mon, 23 Jan 2023 08:17:33 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     David Howells <dhowells@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jeff Layton <jlayton@...nel.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>, linux-mm@...ck.org
Subject: Re: [PATCH v7 2/8] iov_iter: Add a function to extract a page list
 from an iterator

On Mon, Jan 23, 2023 at 05:11:14PM +0100, Jan Kara wrote:
> I'm all for using only pin/unpin in the end. But you'd still need to handle
> the 'put' for the intermediate time when there are still FOLL_GET users of
> the bio infrastructure, wouldn't you?

Yes, we need it for the transition.  But Dave already has a patch to
convert the legacy direct-io code as well, at which point we can
the retire the get bit.