While btrfs does its resizing, df stats are messed up. Seen in linux-3.9.9. Don't know if it still occurs. 11:55 ares07:/home/snap # btrfs fi resize 250G /home/snap/red & [1] 2861 Resize '/home/snap/red' of '250G' 11:55 ares07:/home/snap # 11:55 ares07:/home/snap # df -h Filesystem Size Used Avail Use% Mounted on /dev/loop0 600G 239G 16E 1% /home/snap/red ^^^ /dev/loop0 629145600 250249968 18014398497657468 1% /home/snap/red (So it's not exactly a magic number (2^n)-1 or something.) btrfs-progs-v0.20-rc1-358-g194aa4a.tar.bz2 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html