Not a user of btrfs, but the userspace tools are in package btrfs-tools https://packages.debian.org/search?keywords=btrfs-tools and the kernel modules seem to be in the default kernel packages $ dpkg -L linux-image-3.2.0-4-amd64 | grep btrfs.ko /lib/modules/3.2.0-4-amd64/kernel/fs/btrfs/btrfs.ko Jeff