Improving ext4: bigalloc, inline data, and metadata checksums

Actually, as the author of earlier forms of the FreeBSD readahead/writebehind, I do know that FreeBSD can be very aggressive with larger reads/writes than just the block size. One really big advantage of the FreeBSD buffering is that the length of the queues/pending writes is generally planned to be smaller, thereby avoiding that nasty sluggish feeling (or apparent stopping) that occurs with horribly large pending writes.