Btrfs debugging support

configname: CONFIG_BTRFS_DEBUG

Linux Kernel Configuration
└─>File systems
└─>Btrfs debugging support
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Enable run-time debugging support for the btrfs filesystem. This may
enable additional and expensive checks with negative impact on
performance, or export extra information via sysfs.

If unsure, say N.