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c600f0687f
vq_lock is already too congested for two more operations per I/O. Instead of dropping and reacquiring it inside vdev_queue_aggregate() delegate the zio_vdev_io_bypass() and zio_execute() calls for parent I/Os to callers, that drop the lock any way to execute the new I/O. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Mark Maybee <mark.maybee@delphix.com> Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Closes #12297