linux-kernel - Re: [PATCH 3/4] splice: Use init_sync_kiocb() in filemap_splice

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Date:   Mon, 13 Feb 2023 15:24:55 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...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>
Subject: Re: [PATCH 3/4] splice: Use init_sync_kiocb() in
 filemap_splice_read()

On Mon, Feb 13, 2023 at 01:46:18PM +0000, David Howells wrote:
> Use init_sync_kiocb() in filemap_splice_read() rather than open coding it
> and filter out IOCB_NOWAIT since the splice is synchronous.

If the user has asked for NOWAIT and the splice is going to be
synchronous, shouldn't we rather return -EWOULDBLOCK here?  Or
does this not block?

IOW, this either does the wrong thing, or it does something that's
irrelevant.