CodaFi added a comment. Switched tactics here. Rather than just change the source of the entropy, let's increase it from just inodes to (64-bits of inode) plus (file size) plus (mod time). It is still possible to defeat this scheme, but it means an attacker would have to replace the PCM with one that has been padded out to the same size then backdate its modtime to match the one in the cache - or some cascading failure of the syscalls providing these data conspires to make this happen.
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