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Reviewed by: Matt Ahrens <matthew.ahrens@delphix.com> Reviewed by: Eric Schrock <eric.schrock@delphix.com> Reviewed by: Christopher Siden <chris.siden@delphix.com> Approved by: Garrett D'Amore <garrett@damore.org> NOTES: This patch has been reworked from the original in the following ways to accomidate Linux ZFS implementation *) Usage of the cyclic interface was replaced by the delayed taskq interface. This avoids the need to implement new compatibility code and allows us to rely on the existing taskq implementation. *) An extern for zfs_txg_synctime_ms was added to sys/dsl_pool.h because declaring externs in source files as was done in the original patch is just plain wrong. *) Instead of panicing the system when the deadman triggers a zevent describing the blocked vdev and the first pending I/O is posted. If the panic behavior is desired Linux provides other generic methods to panic the system when threads are observed to hang. *) For reference, to delay zios by 30 seconds for testing you can use zinject as follows: 'zinject -d <vdev> -D30 <pool>' References: illumos/illumos-gate@283b84606b https://www.illumos.org/issues/3246 Ported-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1396 |
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