| To: | Dan Williams <dan.j.williams@xxxxxxxxx> |
|---|---|
| Subject: | Re: [PATCH v2 2/3] mm, dax: add VM_DAX flag for DAX VMAs |
| From: | Christoph Hellwig <hch@xxxxxx> |
| Date: | Thu, 15 Sep 2016 10:26:15 +0200 |
| Cc: | linux-mm@xxxxxxxxx, linux-nvdimm@xxxxxxxxxxxx, david@xxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, npiggin@xxxxxxxxx, xfs@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, hch@xxxxxx |
| Delivered-to: | xfs@xxxxxxxxxxx |
| In-reply-to: | <147392247875.9873.4205533916442000884.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
| References: | <147392246509.9873.17750323049785100997.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> <147392247875.9873.4205533916442000884.stgit@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> |
| User-agent: | Mutt/1.5.17 (2007-11-01) |
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. |
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