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labeled disk. This is complicated by the fact that BBSIZE is greater than the PAGE_SIZE limit ioctl inflicts on arguments which are automatically copied in. As long as we don't need access to userland memory (copyin/out) we can deal with the ioctl using g_callme() which executes it from the GEOM event thread. Once we need copyin/out, we need to return the bio with EDIRIOCTL in order to make geom_dev call us back in the original process context where copyin will work. Unfortunately, that results in us getting called with Giant, so we have to DROP_GIANT/PICKUP_GIANT around the code where we diddle GEOMs internals. Sometimes you just can't win... ... But it does make geom_bsd.c an almost complete example of the GEOM beastiarium.
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