> Backref walk is quite tricky in btrfs, we don't really have a good way > to detect whether it's a good idea or not, until we crash... I see... > > But at least, we have some plan to fix it, hopefully sooner than later. That's good to hear > That's correctly, that will punch holes for *unused* space. > But still, all 0 extents are still considered used, thus won't really work. Ahh that's what you mean, yeah it won't get those. But the thing is, most all-0 pages should occur in unused space of disk images, there shouldn't be much else that stores so many zeros. > Since deduperemover has already skipped all 0 extents, it should be a > big problem I guess? As I said, I might've ran it once or twice without the flag but I don't fully remember anymore. -Atemu
