Re: [PATCH 4/4] xfs: allocate direct I/O COW blocks in iomap_begin

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On Fri, Feb 03, 2017 at 11:53:59AM +0100, Christoph Hellwig wrote:
> > I think this is incorrect -- we create an unwritten extent in the cow
> > fork above (BMAP_COWFORK | BMAP_PREALLOC) but we no longer convert the
> > part we're actually writing to a real extent.  This means that
> > _reflink_cow won't actually remap anything that we've written.
> 
> It's not correct and I messed up when rebasing - the version I tested
> still had it and worked.  Sigh..

Or rather I hadn't finished rebasing and the version I had was totally
b0rked.  Proper one in progress now..
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