On Mon, Feb 08, 2021 at 08:10:44PM -0800, Darrick J. Wong wrote:

From: Darrick J. Wong <djwong@kernel.org>

There are a few places in xfs_repair's directory checking code where we
deliberately corrupt a directory entry as a sentinel to trigger a
correction in later repair phase.  In the mean time, the filesystem is
inconsistent, so set the needsrepair flag to force a re-run of repair if
the system goes down.

I guess this is an improvement over what we have no, but I suspect an
in-core side band way to notify the later phases would be much better
than these corrupt sentinel values..