btrfsck - check a btrfs filesystem
btrfsck is used to check a btrfs filesystem. device is the device file where the filesystem is stored.
btrfsck is part of btrfs-progs. Btrfs is currently under heavy development, and not suitable for any uses other than benchmarking and review. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for further details.