"check-hash protection"

[Robert Huff]

	[Isending this to questions@ for future referrence.]

	Recently upgraded a system from 11.* to HEAD.
	Had to run fsck, and it offered to add "check-hash protection".
Not knowing what it was, I declined.
	Nothing in "man fsck"; nothing in "man tunefs"; nothing found
using Google.
	Where is this documented?


			Prudently,


				Robert Huff