moving a subvol

[Gene Czarcinski <gczarcinski@gmail.com>]

I have hunted high and low for the information but, if it is out there, 
it is well hidden.

What I want to do:  I want to relocate (move) a subvolume from one BTRFS 
volume to a different BTRFS volume.

I have seen the writeup for incremental backup which takes a snapshot, 
and then using btrfs-send and btrfs-receive to create a copy on a 
different volume.  That works fine except the btrfs-receive set the new 
copy to be readonly.

What I want to do is to use that new subvolume read/write.  The only way 
I have figured out to do this is to create another snapshot on the new 
volume which is NOT readonly.  I believe that means I need to keep both 
of these subvolumes around.

Gene