linux-ext4 - Re: [PATCH v20 05/32] splice: Make splice from a DAX file use direct_splice

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Date:   Fri, 19 May 2023 01:10:16 -0700
From:   Christoph Hellwig <hch@...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>,
        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>,
        Christian Brauner <brauner@...nel.org>,
        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>, linux-erofs@...ts.ozlabs.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH v20 05/32] splice: Make splice from a DAX file use
 direct_splice_read()

On Fri, May 19, 2023 at 08:40:20AM +0100, David Howells wrote:
> +#ifdef CONFIG_FS_DAX
> +	if (IS_DAX(in->f_mapping->host))

No need for the ifdef.  IS_DAX is compile-time false if CONFIG_FS_DAX
is not set.

A comment on why we're doing this in the code would probably be useful
as well.