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Alexander Motin
0ea44e576b
Implementation of DDT pruning introduced verification of DVAs in a block pointer during ddt_lookup() to not by mistake free previous pruned incarnation of the entry. But when writing a new block in zio_ddt_write() we might have the DVAs only from override pointer, which may never have "D" flag to be confused with pruned DDT entry, and we'll abandon those DVAs if we find a matching entry in DDT. This fixes deduplication for blocks written via dmu_sync() for purposes of indirect ZIL write records, that I have tested. And I suspect it might actually allow deduplication for Direct I/O, even though in an odd way -- first write block directly and then delete it later during TXG commit if found duplicate, which part I haven't tested. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #17120