block: add a queue_limits_set helper

Add a small wrapper around queue_limits_commit_update for stacking
drivers that don't want to update existing limits, but set an
entirely new set.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240228225653.947152-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-settings.c b/block/blk-settings.c
index b6bbe683d218faa8d80875afe2466074911c1ff0..1989a177be201ba771262b9efdb486008d8bbd31 100644 (file)
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -266,6 +266,24 @@ int queue_limits_commit_update(struct request_queue *q,
 }
 EXPORT_SYMBOL_GPL(queue_limits_commit_update);
 
+/**
+ * queue_limits_commit_set - apply queue limits to queue
+ * @q:         queue to update
+ * @lim:       limits to apply
+ *
+ * Apply the limits in @lim that were freshly initialized to @q.
+ * To update existing limits use queue_limits_start_update() and
+ * queue_limits_commit_update() instead.
+ *
+ * Returns 0 if successful, else a negative error code.
+ */
+int queue_limits_set(struct request_queue *q, struct queue_limits *lim)
+{
+       mutex_lock(&q->limits_lock);
+       return queue_limits_commit_update(q, lim);
+}
+EXPORT_SYMBOL_GPL(queue_limits_set);
+
 /**
  * blk_queue_bounce_limit - set bounce buffer limit for queue
  * @q: the request queue for the device

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index a14ea934413850559cb158dff5a27644d3804496..dd510ad7ce4b45e17eaa673d23af453dee3747ff 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -889,6 +889,7 @@ queue_limits_start_update(struct request_queue *q)
 }
 int queue_limits_commit_update(struct request_queue *q,
                struct queue_limits *lim);
+int queue_limits_set(struct request_queue *q, struct queue_limits *lim);
 
 /*
  * Access functions for manipulating queue properties