Many complain about btrfs space problems, partly some things should be improved in btrfs (and they are doing it, like recently with automatic reclaim) but mostly it's due to user choices/usage and poor or bad maintenance.
From what I've seen the problems you can have with space issues are caused by snapshots (underestimating the space), increase space used (underestimated) given by defragmentation with snapshots, free but allocated space (you can easily see it with btrfs fi usage and solve it with balance) and finally an excess of what in btdu is defined as "unreachable" for which I have not found a good enough method outside of btdu.
As I have recently noticed the enormous fragmentation of some files in some cases can lead the files to occupy much more than the actual space, not freeable even with balance if not after a defragmentation, I have seen cases in which they have come to occupy even double or triple the space.
So I think btdu would be a must have for an optimal btrfs support.I took a very quick look, even though I wouldn't have enough time to maintain this package too and I have zero knowledge of Dlang.
About dipendencies of btdu seems are showed here (or I'm wrong?): https://github.com/CyberShadow/btdu/blob/master/dub.sdl
I don't understand if are missed in Debian, emsi_containers seems present (https://tracker.debian.org/pkg/dcontainers), about ae, btrfs and ncurses (for dlang) seems missed but I'm not sure.
dh-dlang, dub and various essential Dlang packages was removed from testing (caused by ldc, another dlang package).
What is the level of support for dlang build packages in Debian?Probably this information would be useful to someone who wants to see ifpackage btdu.
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