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From:   Miklos Szeredi <miklos@szeredi.hu>
Date:   Wed, 15 Feb 2023 16:50:04 +0100
Message-ID: <CAJfpegt5OurEve+TvzaXRVZSCv0in8_7whMYGsMDdDd2EjiBNQ@mail.gmail.com>
Subject: Re: [PATCH v15 05/17] overlayfs: Implement splice-read
To:     David Howells <dhowells@redhat.com>
Cc:     Jens Axboe <axboe@kernel.dk>, Al Viro <viro@zeniv.linux.org.uk>,
        Christoph Hellwig <hch@infradead.org>,
        Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
        Jeff Layton <jlayton@kernel.org>,
        David Hildenbrand <david@redhat.com>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Logan Gunthorpe <logang@deltatee.com>,
        Hillf Danton <hdanton@sina.com>, linux-fsdevel@vger.kernel.org,
        linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Christoph Hellwig <hch@lst.de>,
        John Hubbard <jhubbard@nvidia.com>,
        linux-unionfs@vger.kernel.org
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On Wed, 15 Feb 2023 at 16:41, David Howells <dhowells@redhat.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