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zap_lockdir() / zap_unlockdir() should take a "void *tag" argument which tags the hold on the zap. This will help diagnose programming errors which misuse the hold on the ZAP. Sponsored by: Intel Corp. Closes #108 Reviewed by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed by: Steve Gonczi <steve.gonczi@delphix.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov> Author: Matthew Ahrens <mahrens@delphix.com> openzfs/openzfs@0780b3eab5
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