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0ece356db5
Add a SA interface which allows us to release the spill block from a SA handle without destroying the handle. This is useful because we can then ensure that a copy of the dirty spill block is not made at sync time due to the extra hold. Susequent calls to sa_update() or sa_lookup() with transparently refetch the spill block dbuf from the ARC hash. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>