[Rpm-maint] [rpm-software-management/rpm] rpm --rebuilddb in an overlayfs without redirect_dir=on (Discussion #2905)

[Michal Domonkos]

Right, that is a valid question, although I'm no expert on OverlayFS so can't really answer that. 

The only "explanation" (as to why EXDEV is issued on a `rename(2)` call) that I've found is the following excerpt from a comment in the OverlayFS [code](https://github.com/torvalds/linux/blob/v4.8-rc2/fs/overlayfs/copy_up.c#L318-L322):

> [...] This means, when copying up a directory we can rely on it and ancestors being stable.

There's also some more documentation on `redirect_dir` [here](https://docs.kernel.org/filesystems/overlayfs.html#renaming-directories) with some hints on the "why" (although no clear explanation either).

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