Re: [PATCH v2 00/10] fsdax,xfs: Add reflink&dedupe support for fsdax

[Neal Gompa]

On Sat, Mar 13, 2021 at 8:09 AM Adam Borowski <kilobyte@xxxxxxxxxx> wrote:
>
> On Wed, Mar 10, 2021 at 02:26:43PM +0000, Matthew Wilcox wrote:
> > On Wed, Mar 10, 2021 at 08:21:59AM -0600, Goldwyn Rodrigues wrote:
> > > DAX on btrfs has been attempted[1]. Of course, we could not
> >
> > But why?  A completeness fetish?  I don't understand why you decided
> > to do this work.
>
> * xfs can shapshot only single files, btrfs entire subvolumes
> * btrfs-send|receive
> * enumeration of changed parts of a file
>

XFS cannot do snapshots since it lacks metadata COW. XFS reflinking is
primarily for space efficiency.



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