> I don't find this check in chain started from syscall and ends in ext2_rename
> Correct me if I'm wrong.
Take a look at may_delete(). Heck, it's even documented there -
* 7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
* 8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
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