linux-kernel - Re: [PATCH v21 08/30] splice: Make splice from a DAX file use copy_splice

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Message-ID: <20230520-gepocht-akzeptabel-b117346c55b6@brauner>
Date:   Sat, 20 May 2023 11:41:27 +0200
From:   Christian Brauner <brauner@...nel.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>,
        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 v21 08/30] splice: Make splice from a DAX file use
 copy_splice_read()

On Sat, May 20, 2023 at 01:00:27AM +0100, David Howells wrote:
> Make a read splice from a DAX file go directly to copy_splice_read() to do
> the reading as filemap_splice_read() is unlikely to find any pagecache to
> splice.
> 
> I think this affects only erofs, Ext2, Ext4, fuse and XFS.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> cc: Christoph Hellwig <hch@....de>
> cc: Al Viro <viro@...iv.linux.org.uk>
> cc: Jens Axboe <axboe@...nel.dk>
> cc: linux-erofs@...ts.ozlabs.org
> cc: linux-ext4@...r.kernel.org
> cc: linux-xfs@...r.kernel.org
> cc: linux-fsdevel@...r.kernel.org
> cc: linux-block@...r.kernel.org
> cc: linux-mm@...ck.org
> ---

Fwiw, O_DIRECT and DAX could've just been folded into one patch imho.
Reviewed-by: Christian Brauner <brauner@...nel.org>