Files
mirror_zfs/include/sys
Alexander Motin 21bbe7cb67 Improve caching for dbuf prefetches
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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