Re: [PATCH v5 1/5] mm: add vm_insert_mixed_mkwrite()

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On Tue, Jul 25, 2017 at 01:14:00AM +0300, Kirill A. Shutemov wrote:
> I guess it's up to filesystem if it wants to reuse the same spot to write
> data or not. I think your assumptions works for ext4 and xfs. I wouldn't
> be that sure for btrfs or other filesystems with CoW support.

Or XFS with reflinks for that matter.  Which currently can't be
combined with DAX, but I had a somewhat working version a few month
ago.
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