zfsonlinux/zfs — pull request #1826 by maxximino (2013-11-02 23:47:30+00:00)
Title: Update Posix ACL patch to be compatible with kernels without Posix ACL.

Removing the acltype property would have needed to rebuild userspace components for different kernels.
So I decided to leave acltype as is, and print a KERN_EMERG message when using a dataset with posixacl enabled on a non-posix-acl-enabled kernel.