Excerpts from Mike Frysinger's message of 2011-02-19 19:53:18 -0500:

2011/2/19 P=C3=A1draig Brady:

quoted

On 19/02/11 18:28, Mike Frysinger wrote:

quoted

based on other threads (which i havent been following too closely)=

, did we

quoted

quoted

settle on this being a btrfs bug ?

Nope, cp 8.10 is not absolved yet.
It may be btrfs not honoring FIEMAP_FLAG_SYNC,
and/or it may be cp needing to handle FIEMAP_EXTENT_ENCODED
specially.

It would help if you ran `sync` before the copy,
to exclude that as a possible issue.

=20
makes no difference after applying this patch:

I've got a fix for this on the btrfs side in testing.  It is definitely
a btrfs bug.

-chris
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