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0969a94bfc
Each of the different block types had a reading function that read a block and then checked their reference struct for their block type. This gets rid of each block reference type and has a single block_ref type which is then checked by a single ref reading function in the block core. By putting ref checking in the core we no longer have to export checking the block header crc, verifying headers, invalidating blocks, or even reading raw blocks themseves. Everyone reads refs and leaves the checking up to the core. The changes don't have a significant functional effect. This is mostly just changing types and moving code around. (There are some changes to visible counters.) This shares code, which is nice, but this is putting the block reference checking in one place in the block core so that in a few patches we can fix problems with writers dirtying blocks that are being read. Signed-off-by: Zach Brown <zab@versity.com>