linux-ext4 - Re: [PATCH v7 05/14] ext4, dax: introduce ext4_dax

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Message-ID: <20180329180927.GA16055@lst.de>
Date:   Thu, 29 Mar 2018 20:09:27 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jan Kara <jack@...e.cz>
Cc:     Dan Williams <dan.j.williams@...el.com>, linux-nvdimm@...ts.01.org,
        Theodore Ts'o <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        linux-ext4@...r.kernel.org, david@...morbit.com, hch@....de,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 05/14] ext4, dax: introduce ext4_dax_aops

On Thu, Mar 29, 2018 at 05:40:35PM +0200, Jan Kara wrote:
> So ext4_direct_IO() for IS_DAX() files will just bail out. So could you
> just provide ext4_dax_direct_IO() which will bail out and use it here? With
> a similar comment as in xfs_vm_direct_IO() that open still needs this
> method set... Thanks!

In fact a common noop_direct_IO might make sense.