If I recall the way BSD handles this is to send all writes to the *last
mounted* filesystem. This seems to me a cleaner way to handle this rather
than forcing users to mount filesystems r-o.
> 2. There must not be any name clashes between the contents of
> the partition(s) already mounted at that point and that of
> the root directory of the partition being transparently
> mounted on top of it.
I dont know how BSD handles namespace collisions, but this could be
handled by hashing the duplicate filenames in some way.
-Dan
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