block: add a blk_mq_init_queue_data helper
This allows a driver to pass a queuedata member before ->init_hctx is
called. null_blk currently open codes this logic, but I'd rather have
it in the core to ease future maintainance.
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 745ec59..216bf62 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2724,13 +2724,15 @@ void blk_mq_release(struct request_queue *q)
blk_mq_sysfs_deinit(q);
}
-struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
+struct request_queue *blk_mq_init_queue_data(struct blk_mq_tag_set *set,
+ void *queuedata)
{
struct request_queue *uninit_q, *q;
uninit_q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node);
if (!uninit_q)
return ERR_PTR(-ENOMEM);
+ uninit_q->queuedata = queuedata;
/*
* Initialize the queue without an elevator. device_add_disk() will do
@@ -2742,6 +2744,12 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
return q;
}
+EXPORT_SYMBOL_GPL(blk_mq_init_queue_data);
+
+struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
+{
+ return blk_mq_init_queue_data(set, NULL);
+}
EXPORT_SYMBOL(blk_mq_init_queue);
/*
