@DemiMarie I wonder whether packaging fsverity (Merkle tree) metadata into the
rpm header would be an option for performant block-based hashing. It'd also
bloat the rpm header, but may have the benefit of allowing the metadata to be
reused for post-installation integrity and authenticity protection (assuming
the files remain read-only and reside on ext4/btrfs).
For my specific `BTRFS_IOC_ENCODED_WRITE` use case, I didn't intend to
implement it as a plug-in, but as part of core. The implementation doesn't
require modifications to the existing on-disk format, and the only FS specific
behaviour is the actual encoded write ioctl calls.
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