Code inspection shows that qcow2_update_cluster_refcount() no longer
calls bdrv_flush().  This issue has been fixed.

** Changed in: qemu
       Status: Incomplete => Fix Released

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  qemu-img snapshot -c is unreasonably slow

Status in QEMU:
  Fix Released

Bug description:
  Something fishy is going on with qcow2 internal snapshot creation
  times.  I don't know if this is a regression because I haven't used
  internal snapshots in the past.

  QEMU 1.4-rc2:
  $ qemu-img create -f qcow2 test.qcow2 -o size=50G,preallocation=metadata
  $ time qemu-img snapshot -c new test.qcow2
  real  3m39.147s
  user  0m10.748s
  sys   0m26.165s

  (This is on an SSD)

  I expect snapshot creation to take under 1 second.

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