zfsonlinux/zfs — pull request #1628 by maxximino (2013-08-07 08:49:12+00:00)
Title: Fixed the default checksum algorithm in the manpage.

I've noticed a mismatch between the man page and the source code about the default algorithm for checksum=on.
The manpage reports fletcher2, but zio.h (https://github.com/zfsonlinux/zfs/blob/master/include/sys/zio.h#L85) says it's fletcher4.