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As was previously done for BRT, avoid holding/releasing DDT ZAP dnodes for every access. Instead hold the dnodes during all their life time, never releasing. While at this, add _by_dnode() interfaces for zap_length_uint64() and zap_count(), actively used by DDT code. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #18047