[Unionfs] Strange behavior when adding a branch

[Jefferson Ogata]

On 07/09/07 00:06, Shaya Potter wrote:
> Users want to be able to run programs within Unionfs.  Running programs
> requires mmaping files.  Without the semantic we expect, mmap programs
> should break OR you have an inconsistent semantic.  If a file is opened,
> and a new version is placed to the left of it, it should be left as is,
> basically treated as if it was unlinked and a new version was created

I'd have to agree that the expected semantics of pushing a branch on top
of a unionfs mount would be the same as when mounting a filesystem on
top of another--file descriptors open on the underlying mount would
continue to refer to underlying objects.

I'm not complaining; I'm just saying that I believe this is the natural
expectation.