Re: [PATCH v2 1/4] define PAGECACHE_TAG_* as enumeration under include/uapi

[Naoya Horiguchi]

On Fri, Jul 04, 2014 at 11:16:39AM +1000, Dave Chinner wrote:
> On Thu, Jul 03, 2014 at 05:52:12PM -0400, Naoya Horiguchi wrote:
> > We need the pagecache tags to be exported to userspace later in this
> > series for fincore(2), so this patch moves the definition to the new
> > include file for preparation. We also use the number of pagecache tags,
> > so this patch also adds it.
> > 
> > Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> 
> NACK.
> 
> The radix tree tags are deeply internal implementation details.
> They are an artifact of the current mark-and-sweep writeback
> algorithm, and as such should never, ever be exposed to userspace,
> let alone fixed in an ABI we need to support forever more.

Hm, OK, so I'll do whole this series without pagecache tag things.

Thanks,
Naoya Horiguchi
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