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md/raid5: export is_congested test

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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>
This commit is contained in:
NeilBrown
2010-07-26 11:57:07 +10:00
parent 4a5add4995
commit 11d8a6e371
2 changed files with 17 additions and 7 deletions
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drivers/md/raid5.h
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@@ -497,5 +497,7 @@ static inline int algorithm_is_DDF(int layout)
{
return layout >= 8 && layout <= 10;
}
extern int md_raid5_congested(mddev_t *mddev, int bits);
extern int raid5_set_cache_size(mddev_t *mddev, int size);
#endif