Curious about corner case in btrfs code

[Valdis.Kletnieks at vt.edu]

On Tue, 26 Aug 2014 20:13:10 -0400, Nick said:

> From reading the code off the bat, seems to not need to be written as this case is rarely meet for large files
> or files that are huge and take a lot of time to write.

Nope.  Same exact logic for small files.  The code is doing "Don't bother
trying to decompress if we're off the end of the file entirely".  Doesn't
matter if the file is 43K in size or 43G.
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