Version information:

  # btrfs --version
  Btrfs v3.17
  # uname -a
  Linux maru2 3.16.0-4-amd64 #1 SMP Debian 3.16.7-2 (2014-11-06) x86_64 
GNU/Linux

In the following system, /backup is a mounted subvolume.  The initial
send/receive worked, but when trying to send an incremental I get the
following warning:

  # btrfs send -p /snapshots/2014-12-09 /snapshots/test | btrfs receive -vvv 
/backup/snapshots/root/
  At subvol /snapshots/test
  At snapshot test
  receiving snapshot test uuid=9c72c30a-04c0-6442-9a9a-7ee9c56014e2, 
ctransid=1030360 parent_uuid=4eb30116-2c1a-f94d-b964-98cd41262dfb, 
parent_ctransid=1030202
  It seems that you have changed your default subvolume or you specify other 
subvolume to
  mount btrfs, try to remount this btrfs filesystem with fs tree, and run btrfs 
receive again!

I understand what it is saying, but I have to ask, why?  Why does it or
should it need me to remount the root fs to do an incremental receive?

-- 
Michael Welsh Duggan
(m...@md5i.com)

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