linux-kernel - Re: [PATCH v2 2/3] mm, dax: add VM

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Message-ID: <20160915082615.GA9772@lst.de>
Date:   Thu, 15 Sep 2016 10:26:15 +0200
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     linux-mm@...ck.org, linux-nvdimm@...ts.01.org, david@...morbit.com,
        linux-kernel@...r.kernel.org, npiggin@...il.com, xfs@....sgi.com,
        linux-fsdevel@...r.kernel.org, hch@....de
Subject: Re: [PATCH v2 2/3] mm, dax: add VM_DAX flag for DAX VMAs

On Wed, Sep 14, 2016 at 11:54:38PM -0700, Dan Williams wrote:
> The DAX property, page cache bypass, of a VMA is only detectable via the
> vma_is_dax() helper to check the S_DAX inode flag.  However, this is
> only available internal to the kernel and is a property that userspace
> applications would like to interrogate.

They have absolutely no business knowing such an implementation detail.