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After resuming a pool the godfather zio could have both the ZIO_REEXECUTE_NOW and ZIO_REEXECUTE_SUSPEND bits set. This can occur if some child zios set ZIO_REEXECUTE_NOW while other set ZIO_REEXECUTE_SUSPEND. The godfather zio can inherit both flags in zio_notify_parent(). The child zios which assigned the ZIO_REEXECUTE_SUSPEND flag will be removed from the godfather's child list and added to the spa->spa_suspend_zio_root child list. While child zios with the ZIO_REEXECUTE_NOW bit set remain being monitored by the godfather zio. When the godfather zio executes zio_done() the presence of the ZIO_REEXECUTE_SUSPEND bit results in all io_reexecute being cleared. These child zios will then not be re-executed and instead will be destroyed and lost. The most straight forward way to address this situation is to only clear the ZIO_REEXECUTE_SUSPEND bit and leave the ZIO_REEXECUTE_NOW bit set. Reviewed-by: George Melikov <mail@gmelikov.ru> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: yuxiang <guo.yong33@zte.com.cn> |
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