mm: bdi init hooks

provide BDI constructor/destructor hooks

[akpm@linux-foundation.org: compile fix]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 3 deletions

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 9eabac9..524404b 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1786,6 +1786,7 @@ static void blk_release_queue(struct kobject *kobj)
 
 	blk_trace_shutdown(q);
 
+	bdi_destroy(&q->backing_dev_info);
 	kmem_cache_free(requestq_cachep, q);
 }
 
@@ -1839,21 +1840,27 @@ static struct kobj_type queue_ktype;
 struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
 {
 	struct request_queue *q;
+	int err;
 
 	q = kmem_cache_alloc_node(requestq_cachep,
 				gfp_mask | __GFP_ZERO, node_id);
 	if (!q)
 		return NULL;
 
+	q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
+	q->backing_dev_info.unplug_io_data = q;
+	err = bdi_init(&q->backing_dev_info);
+	if (err) {
+		kmem_cache_free(requestq_cachep, q);
+		return NULL;
+	}
+
 	init_timer(&q->unplug_timer);
 
 	kobject_set_name(&q->kobj, "%s", "queue");
 	q->kobj.ktype = &queue_ktype;
 	kobject_init(&q->kobj);
 
-	q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
-	q->backing_dev_info.unplug_io_data = q;
-
 	mutex_init(&q->sysfs_lock);
 
 	return q;