Comment 16 for bug 1873074

Mauricio,

Thank you for noticing me (as an upstream developer) and your thorough
analysis.
Your patch is good, but it didn't pass my local test. Because the test
has a case "branch manipulation: change the branch permission RW to RO."
The test is for an aufs specific feature which enables users to change
the permission of a branch (layer) dynamically. The one RW plus one or
more RO layers case is common, but users can have multiple RW layers and
change them into RO layers without unmounting aufs.

So I added another fix over yours and I am testing it now. It will take
several days.