- if (!q->plugged)
The result appears to be that if a block device has called
blk_queue_pluggable() to register a no-op plug_fn, then
q->plugged will never be set (it's the duty of the plug_fn),
and the devices registered request function wil never be called.
This behaviour is distinct from 2.4.0, where registering a
no-op made things work fine.
Is the policy now supposed to be that we do some more work
in the "no-op"? What am I supposed to do if I don't want
(1) goes away and looks ....
(2) actually, I do want plugging, but I like to keep the
no-plug option around so that I can benchmark the difference
and also provide a very conservative option setting.
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