Defragmenting open files

Defragmenting open files

[Swâmi Petaramesh]

Hi folks,

My BTRFS systems now have slowed down to the point where I finally
decided to trash all my snapshots and try and defrag it all.

I basically wrote a shell script that goes down the complete FS tree,
runs a "filefrag" over each file and issues a "btrfs filesystem defrag
$blah" against every files which number of fragments is > 1.

I'm currently running it, but I notice that for every file that is
likely open (i.e. /bin/bash), my script spits out :

failed to open /bin/bash
open:: Text file busy
total 1 failures
FAILED !

I expected that the BTRS defragmentation was done by the kernel and was
able to handle open files, but apparently not ?

Another question is : Is there a way to determine if a directory needs a
defrag ? filefrag doesn't seem to be able to work properly against a
directory...

TIA.

Kind regards.

-- 
Swâmi Petaramesh <swami@petaramesh.org> http://petaramesh.org PGP 9076E32E
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