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Date:   Tue, 21 Jul 2020 18:01:43 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     "Darrick J. Wong" <darrick.wong@oracle.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Matthew Wilcox <willy@infradead.org>,
        Goldwyn Rodrigues <rgoldwyn@suse.de>,
        Dave Chinner <david@fromorbit.com>,
        Damien Le Moal <damien.lemoal@wdc.com>,
        Naohiro Aota <naohiro.aota@wdc.com>,
        Johannes Thumshirn <jth@kernel.org>,
        linux-btrfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        cluster-devel@redhat.com, linux-ext4@vger.kernel.org,
        linux-xfs@vger.kernel.org,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        linux-man@vger.kernel.org
Subject: Re: RFC: iomap write invalidation
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On Tue, Jul 21, 2020 at 08:59:25AM -0700, Darrick J. Wong wrote:
> In the comment that precedes iomap_dio_rw() for the iomap version,

maybe let's just do that..

> ``direct_IO``
> 	called by the generic read/write routines to perform direct_IO -
> 	that is IO requests which bypass the page cache and transfer
> 	data directly between the storage and the application's address
> 	space.  This function can return -ENOTBLK to signal that it is
> 	necessary to fallback to buffered IO.  Note that
> 	blockdev_direct_IO and variants can also return -ENOTBLK.

->direct_IO is not used for iomap and various other implementations.
In fact it is a horrible hack that I've been trying to get rid of
for a while.