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 13:19:52 +0000
From:   David Howells <dhowells@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jens Axboe <axboe@...nel.dk>, Jan Kara <jack@...e.cz>,
        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

David Hildenbrand <david@...hat.com> wrote:

> Switching from FOLL_GET to FOLL_PIN was in the works by John H. Not sure what
> the status is. Interestingly, Documentation/core-api/pin_user_pages.rst
> already documents that "CASE 1: Direct IO (DIO)" uses FOLL_PIN ... which does,
> unfortunately, no reflect reality yet.

Yeah - I just came across that.

Should iov_iter.c then switch entirely to using pin_user_pages(), rather than
get_user_pages()?  In which case my patches only need keep track of
pinned/not-pinned and never "got".

David