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Add zfs_vdev_parallel_open_enabled module option #6093

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Commits on May 3, 2017

  1. Add zfs_vdev_parallel_open_enabled module option

    Parallel vdev open causes the driver to deadlock when running ZFS on top
    of a zvol with something in between, including, but not limited to the
    loop device. Such configurations are historically unsupported. However,
    enough people have requested the capability over the years that we ought
    to give them a knob to make the configuration work in most instances. We
    have tests for the direct case, but the indirect case continues to be
    unsupported.
    
    Signed-off-by: Richard Yao <ryao@gentoo.org>
    ryao authored and behlendorf committed May 3, 2017
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