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Fix accounting error for pending sync IO ops in zpool iostat
Currently vdev_queue_class_length is responsible for checking how long the queue length is, however, it doesn't check the length when a list is used, rather it just returns whether it is empty or not. To fix this I added a counter variable to vdev_queue_class to keep track of the sync IO ops, and changed vdev_queue_class_length to reference this variable instead. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: MigeljanImeri <ImeriMigel@gmail.com> Closes #15478
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