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743253df70
A config lock should be held while vdev_count_leaves() walks the tree, otherwise the pointers reference may become invalid during the walk. SCL_VDEV is a minimal lock provided for such uses cases. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #7286