Re: high space usage after ext3 btrfs-convert

["koraynilay" <koray.fra@gmail.com>]

Update on this issue:

> which should've been fixed by the defrag
After asking on #btrfs on irc I found the solution, which was actually
to use defrag, but with -t 4G and forcing compression/no compression by
using -czstd/--nocomp.
By running a defrag on the full fs and on some folders/files that still
appeared as <UNREACHABLE>, I was able to get the <UNREACHABLE> space to
~4 GiB (and hopefully it will go to 0 after defragging those remaining
folders/files).

Thanks to Forza for telling me the solution and for multicore and eyeoh
for taking some of their time to help me.

P.S.
> that I had 488 GiB free, but when I deleted ~215 GiB, the free space 
This was actually ~86 GiB, but irrelevant I think.