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9d68c8bba7
Generally as we call block_get() we should validate that if the block has a hdr, at a minimum the crc is correct and the magic value is the expected value passed, and the fsid matches the superblock. This function implements just that. Returns -EINVAL, up to the caller to report a problem() and handle the outcome. For now the code just hard fails, which incedentally makes it fail the clobber-repair.sh tests I wrote. Signed-off-by: Auke Kok <auke.kok@versity.com>