linux-kernel - Re: [PATCH v8 03/10] mm: Provide a helper to drop a pin/ref on a page

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Message-ID: <4909601d-8b3b-6ec2-b8b5-2764772d6e8d@redhat.com>
Date:   Tue, 24 Jan 2023 15:53:53 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>,
        David Howells <dhowells@...hat.com>
Cc:     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>,
        linux-mm@...ck.org
Subject: Re: [PATCH v8 03/10] mm: Provide a helper to drop a pin/ref on a page

On 24.01.23 15:52, Christoph Hellwig wrote:
> On Tue, Jan 24, 2023 at 02:41:33PM +0000, David Howells wrote:
>> Yes.  Christoph insisted that the bio conversion patch be split up.  That
>> means there's an interval where you can get FOLL_GET from that.
> 
> The only place where we have both is in the block layer.  It never gets
> set by bio_set_cleanup_mode.
> 
> Instead we can just keep using put_page dirctly for the BIO_PAGE_REFFED
> case in the callers of bio_release_page and in bio_release_pages itself,
> and then do away with bio_to_gup_flags and bio_release_page entirely.
> 

Thank you, just what I had in mind ...

-- 
Thanks,

David / dhildenb