linux-kernel - Re: [PATCH v8 07/10] block: Switch to pinning pages.

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Date:   Tue, 24 Jan 2023 08:44:43 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        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>
Subject: Re: [PATCH v8 07/10] block: Switch to pinning pages.

On Tue, Jan 24, 2023 at 03:03:53PM +0000, David Howells wrote:
> Christoph Hellwig <hch@...radead.org> wrote:
> 
> > It can't.  Per your latest branch:
> 
> Yes it can.  Patch 6:

This never involves the cleanup mode as input.  And as I pointed out
in the other mail, there is no need for the FOLL_ flags on the
cleanup side.  You can just check the bio flag in bio_release_apges
and call either put_page or unpin_user_page on that.  The direct
callers of bio_release_page never mix them pin and get cases anyway.
Let me find some time to code this up if it's easier to understand
that way.