Re: [PATCH 2/6] ovl: check if upperdir fs supports O_TMPFILE

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On Mon, Jan 16, 2017 at 3:16 PM, Amir Goldstein <amir73il@xxxxxxxxx> wrote:
>> The question is whether anybody actually using it with an fs that
>> doesn't have all of the above.  Because if so, we need to keep
>> supporting them.  Perhaps we should add warnings about deprecation and
>> if nobody complains we can remove support for non-conformant fs.
>>
>
>
> But how exactly do we "support" those fs right now?
> Any attempt to use them would result in -EINVAL, because we will
> bw requesting RENAME_EXCHANGE and RENAME_WHITEOUT

Not unless whiteout/opaque objects are involved, and in fact those are
not very common, so I can imagine a limited usage that doesn't involve
those and will work fine.  But I don't think this scenario is likely,
so we should try deprecating it.

Thanks,
Miklos
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