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2.2.1 Name access (and deleted-block reclamation)

In order to be able to explicitly know when a block is safe to delete, we insist that a user must get NAME lock on a pointer BEFORE releasing READ/WRITE on the block from which the pointer is obtained. NAME lock is useful for other things, such as

• insuring that the block you are PREVing from can’t be deleted while you’re looking elsewhere;
• CHAIN-PUT uses it to insure that the block just split doesn’t disappear during the call to PARENT-INSERT-UPDATE
• others?