Re: [PATCH v5 9/9] btrfs: btrfs_copy_file_range() only supports reflinks

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On Wed, Oct 14, 2015 at 11:00:45PM -0700, Christoph Hellwig wrote:
> On Wed, Oct 14, 2015 at 11:46:08AM -0700, Darrick J. Wong wrote:
> > The documentation for fallocate ought to be updated to include that as part of
> > guaranteeing that subsequent writes to the range won't fail due to ENOSPC,
> > shared blocks will be unshared.
> > 
> > Incidentally, btrfs leaves shared blocks alone.  OTOH, given that it's totally
> > COW it probably doesn't make sense to unshare blocks anyway... but maybe I
> > also don't want to dive into btrfs f-allocation behavior at this time. :)
> > 
> > Ok, so I'll rework the XFS funshare code into something that hangs off the
> > regular fallocate call, and get rid of the explicit 'funshare' bits.
> 
> Yes, that would be my preference.  I'd also like to understand what
> exactly btrfs does in fallocate.

For which part?  The answer changes based on how many references there
are to a given fallocated region.

-chris
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