One other thing I noticed is that the rpm header carries the digest of the
compressed payload in addition to the uncompressed payload digest. Verification
of the compressed payload alongside `BTRFS_IOC_ENCODED_WRITE` is relatively
straightforward, but verifying the uncompressed payload would require
decompression, which we're obviously trying to avoid with this optimization.
I think it's safe to only perform compressed payload verification - zstd frames
can carry an optional xxHash64 hash, which should be suitable for correctness
checking if desired.
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