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To avoid read errors with transaction open dmu_tx_check_ioerr() is used to read everything required in advance. But there seems to be a chance for the buffer to evicted from dbuf cache in between, which result in immediate eviction from ARC, which may require additional disk read later in a place where error handling is problematic. To partially workaround this introduce a new flag DMU_IS_PREFETCH, relayed to ARC as ARC_FLAG_PREFETCH | ARC_FLAG_PRESCIENT_PREFETCH, making ARC delay eviction by at least several seconds, or till the actual read inside the transaction, that will promote it to demand access. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #18160 |
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