NeilBrown 11d8a6e371 md/raid5: export is_congested test
the dm module will need this for dm-raid45.

Also only access ->queue->backing_dev_info->congested_fn
if ->queue actually exists.  It won't in a dm target.

Signed-off-by: NeilBrown <neilb@suse.de>
2010-07-26 12:52:29 +10:00
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