On 11/06/2012 06:57 AM, David Sterba wrote:

On Thu, Nov 01, 2012 at 05:17:04AM +0800, ching wrote:

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3. Is any possible to online defrag a btrfs partition without hindered by mount point/polyinstantied directories?

Sorry, I do not understand the question.

when a device is mounted under a directory, files in the directory is "hidden", and files in the device is "available", right?
when a directory is polyinstantied, files in the original directory is "hidden", and files in the polyinstantied directory is "available",

How to get past them and pass those "hidden" files to defrag command?

I hope I get it right, so unless you have a reference to the directory
with hidden files (using your term), there's no way to access them. And
this is a more generic question, not related to btrfs itself. The hidden
files may also belong to a different filesystem.

david

thank for your explanation

ching