A tentative agreement has been reached in regards to a procedure

    to remove 'b'lock devices.  The agreement is, essentially, that
    block devices will be collapsed into character devices as a first
    step (though I don't particularly agree), and raw device names 'rxxx'
    will become simply 'xxx' in devfs in the second step (i.e. no 'rxxx'
    names will exist).  The renaming will not effect the original /dev
    and the expectation is that devfs will eventually (but not immediately)
    become the standard way to access devices in the system.

    If it is determined that a reimplementation of block device access
    characteristics is beneficial, a number of alternatives will
    be possible that do not involve resurrecting the 'b'lock device class.
    For example, an ioctl() that might be made on an open character device
    descriptor or a generic buffered overlay device.

    This commit removes the blockdev disablement sysctl which does not
    apply to the solution that was reached.

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