linux-kernel - Re: [PATCH v15 05/17] overlayfs: Implement splice-read

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Message-ID: <CAJfpegt5OurEve+TvzaXRVZSCv0in8_7whMYGsMDdDd2EjiBNQ@mail.gmail.com>
Date:   Wed, 15 Feb 2023 16:50:04 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     David Howells <dhowells@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Christoph Hellwig <hch@....de>,
        John Hubbard <jhubbard@...dia.com>,
        linux-unionfs@...r.kernel.org
Subject: Re: [PATCH v15 05/17] overlayfs: Implement splice-read

On Wed, 15 Feb 2023 at 16:41, David Howells <dhowells@...hat.com> wrote:
>
> How about the attached then?
>
> David
> ---
> overlayfs: Implement splice-read
>
> Implement splice-read for overlayfs by passing the request down a layer
> rather than going through generic_file_splice_read() which is going to be
> changed to assume that ->read_folio() is present on buffered files.

Looks good.  One more suggestion: add a vfs_splice() helper and use
that from do_splice_to() as well.

Thanks,
Miklos