On Fri, Aug 25, 2017 at 08:40:32AM -0700, Christoph Hellwig wrote:
> On Fri, Aug 25, 2017 at 11:14:45AM -0400, Theodore Ts'o wrote:
> > > I don't know of anyone that actually uses the flag. If someone did
> > > that would probably run into problems like changing that changing it
> > > on a file that's currently mmaped would crash an burn badly.
> >
> > Crash and burn meaning the *kernel* will crash and burn? Or will data
> > be damaged?
> >
> > Given that, maybe XFS should withdraw support for the DAX and hope no
> > one is actually using it?
>
> Nah, -o dax works very well. It's just the flag instead of the -o dax
> option or rather switching it on a mapped file will probably be very dangerous.
Sorry, I was suggested XFS withdrawing support for the pre-file dax
flag. I thought part of the argument for why ext4 should accept this
patch is that XFS already has the per-file DAX flag?
- Ted
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