Re: btrfs defrag problem

[Sander <sander@humilis.net>]

David Sterba wrote (ao):
> On Thu, Nov 01, 2012 at 05:17:04AM +0800, ching wrote:
> > 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.

What Ching means (I think), is that if you have directories in /home,
and you mount a device onto /home, you cannot see the original
directories in /home anymore.

You can still access them though, with a 'mount -o bind':

# mount -o bind / /mnt
# ls /mnt/home

	Sander