I have a btrfs filesystem mounted in two locations as two subvolumes:

  /dev/mapper/luks-blah /                       btrfs
subvol=/rootvol        1 1
  /dev/mapper/luks-blah /var/lib/libvirt/images     btrfs
nodatasum,nodatacow,subvol=/images.libvirt        1 2

However, a file under the second  mount is getting seriously
fragmented.  It started out with a few dozen extents (reasonable for a
several gigabytes), now it's 11000 and counting, after an application
started pounding on it with a bit of threaded O_DIRECT random I/O.

3.3.1-5.fc16.x86_64

Any hints?
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