linux-kernel - Re: [PATCH v16 03/13] overlayfs: Implement splice-read

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Message-ID: <20230308155609.GA21508@lst.de>
Date:   Wed, 8 Mar 2023 16:56:09 +0100
From:   Christoph Hellwig <hch@....de>
To:     David Howells <dhowells@...hat.com>
Cc:     Miklos Szeredi <miklos@...redi.hu>, 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>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        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 v16 03/13] overlayfs: Implement splice-read

On Wed, Mar 08, 2023 at 03:54:36PM +0000, David Howells wrote:
> Using do_splice_to() as a helper is probably a good idea, though both Willy
> and Christoph seem to dislike it.

That's not true.  What I'm fundamentlly against is pointless wrappers
like the call_* that add no value.  do_splice_to adds useful checks,
so if properly named and documented, I'm absolutely in favour.