Btrfs devel - Mar 2014 - [Help] Errors found in extent allocation tree or chunk allocation

Firstly, it should be noted that I can mount and use my Btrfs file
system with nary an error or warning; however, I'm uncomfortable
using it while it's in some kind of inconsistent state.

The `btrfsck' tool is telling me the following:

  Errors found in extent allocation tree or chunk allocation

In particular, I'm receiving 69158 messages of the following form:

  Extent back ref already exists for <a> parent <b> root <c>

All of those are followed by the same number of messages of the
following form:

  ref mismatch on [<d> 4096] extent item <e>, found <f>
  Incorrect global backref count on <d> found <e> wanted <f>
  backpointer mismatch on [<d> 4096]

I've run several commands in an attempt to repair/recover the file
system, but nothing seems to help.

What is the meaning of these errors, and how should I fix them?

Sincerely,
Michael Witten
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