Odd block-count behaviour

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   Hi,

   I've just been copying large quantities of data from one btrfs
volume to another, and while watching the progress of the copy, I've
noticed something odd.

$ mv source-dir dest-dir
$ watch du -ms source-dir dest-dir

   This gives me a count of the size of the source and target
directories, every 2 seconds. As expected, the size of the source dir
stays constant, and the size of the destination directory increases.
Except when it doesn't.

   Occasionally, while copying, the size of the dest-dir *drops* by
several (tens of) megabytes. I'm not too worried about this, as it all
seems to be copying the data OK, but it just seems a bit odd, and was
wondering of there was a sane explanation for this behaviour.

   I'm running a linux.org 2.6.32.2 kernel, and the destination
filesystem has just been created using the most recent btrfs tools.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
       --- There's many a slip 'twixt wicket-keeper and gully. ---       

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