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vdev_file_io_start() to use taskq_dispatch(TQ_PUSHPAGE)

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The vdev_file_io_start() function may be processing a zio that the
txg_sync thread is waiting on.  In this case it is not safe to perform
memory allocations that may generate new I/O since this could cause a
deadlock.  To avoid this, call taskq_dispatch() with TQ_PUSHPAGE
instead of TQ_SLEEP.

Signed-off-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1928
This commit is contained in:
Ned Bass 2014-01-15 13:52:57 -08:00 committed by Brian Behlendorf
parent 3566d5c7c3
commit 04aa2de8f7
1 changed files with 1 additions and 1 deletions
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module/zfs/vdev_file.c
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@ -185,7 +185,7 @@ vdev_file_io_start(zio_t *zio)
} }
VERIFY3U(taskq_dispatch(system_taskq, vdev_file_io_strategy, zio, VERIFY3U(taskq_dispatch(system_taskq, vdev_file_io_strategy, zio,
TQ_SLEEP), !=, 0); TQ_PUSHPAGE), !=, 0);
return (ZIO_PIPELINE_STOP); return (ZIO_PIPELINE_STOP);
} }