dotcloud/docker — pull request #3892 by tianon (2014-02-02 06:51:34+00:00)
Title: Remove reference to <linux/btrfs.h>, and instead use <btrfs/ioctl.h> like we're supposed to (from btrfs-progs)

This fixes compilation issues when btrfs.h isn't available (because we just need the relevant structs, which for userspace programs are supposed to come from btrfs-progs instead of from the kernel headers directly).