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mirror_zfs/module/zfs
Alexander Motin 4905686e67 DDT: Switch to using ZAP _by_dnode() interfaces
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
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