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35a32c5
(Get the code!)
Mike, if inotify will not actually report all changes on an overlayfs then inotify needs to report an error when someone tries to monitor changes in an overlayfs. Pretty simple, eh?
I mean, you could actually fix it so that inotify DOES report all the changes, but that would be harder than merely erroring out and forcing the userspace program to fall back to polling.
(I don't know how many userspace programs, besides "tail", know how to fall back to polling. But what's the point of having inotify at all, if userspace programs can't depend on it to either produce correct results, or give an error when it can't?)
(I reported bug#977847 in which "apt-get install nfs-common" fails on the latest Ubuntu Beta2 LTS livecd because a critical system facility made the stupid mistake of depending on inotify. Either we have to tell every programmer to pretend inotify doesn't exist as a kernel facility, or we have to fix it. This is not an academic concern; end-users are noticing daily.)