Btrfs File-System Mount Option Testing From Linux 3.14

The AIO-Stress result is only worth pointing out for the nodatacow mount option causing a performance drop while the other mount options didn't have much of an impact for this file-system.

The space cache and noatime mount options had a small improvement in performance for Btrfs from this SanDisk SSD.

FS-Mark yielded big wins when enabling LZO compression (along with Zlib compression) but it's important to keep in mind that it's just a synthetic test writing out the easily compressible data.

Besides the LZO/Zlib compression tests benefiting Dbench, the nodatacow and discard mount options yielded performance improvements over the stock Btrfs mount options.