v2.0.0

The containerd/btrfs library now requires headers from kernel 4.12 or newer:

• https://github.com/torvalds/linux/blob/master/include/uapi/linux/btrfs.h
• https://github.com/torvalds/linux/blob/master/include/uapi/linux/btrfs_tree.h

These files are licensed under the GPL-2.0 WITH Linux-syscall-note, so it should be compatible with the Apache License 2.0. https://spdx.org/licenses/Linux-syscall-note.html

The dependency on the kernel headers only affects users building from source. Users on older kernels may opt to not compile this library, or to provide headers from a newer kernel.

To compile containerd/containerd without btrfs, grep no_btrfs in https://github.com/containerd/containerd/blob/main/BUILDING.md