Merge tag 'block-6.18-20251016' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux

Pull block fixes from Jens Axboe:

 - NVMe pull request via Keith:
     - iostats accounting fixed on multipath retries (Amit)
     - secure concatenation response fixup (Martin)
     - tls partial record fixup (Wilfred)

 - Fix for a lockdep reported issue with the elevator lock and
   blk group frozen operations

 - Fix for a regression in this merge window, where updating
   'nr_requests' would not do the right thing for queues with
   shared tags

* tag 'block-6.18-20251016' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
  nvme/tcp: handle tls partially sent records in write_space()
  block: Remove elevator_lock usage from blkg_conf frozen operations
  blk-mq: fix stale tag depth for shared sched tags in blk_mq_update_nr_requests()
  nvme-auth: update sc_c in host response
  nvme-multipath: Skip nr_active increments in RETRY disposition

5 files changed, 11 insertions, 14 deletions

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index f93de34fe87d..3cffb68ba5d8 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -812,8 +812,7 @@ int blkg_conf_open_bdev(struct blkg_conf_ctx *ctx)
 }
 /*
  * Similar to blkg_conf_open_bdev, but additionally freezes the queue,
- * acquires q->elevator_lock, and ensures the correct locking order
- * between q->elevator_lock and q->rq_qos_mutex.
+ * ensures the correct locking order between freeze queue and q->rq_qos_mutex.
  *
  * This function returns negative error on failure. On success it returns
  * memflags which must be saved and later passed to blkg_conf_exit_frozen
@@ -834,13 +833,11 @@ unsigned long __must_check blkg_conf_open_bdev_frozen(struct blkg_conf_ctx *ctx)
 	 * At this point, we haven’t started protecting anything related to QoS,
 	 * so we release q->rq_qos_mutex here, which was first acquired in blkg_
 	 * conf_open_bdev. Later, we re-acquire q->rq_qos_mutex after freezing
-	 * the queue and acquiring q->elevator_lock to maintain the correct
-	 * locking order.
+	 * the queue to maintain the correct locking order.
 	 */
 	mutex_unlock(&ctx->bdev->bd_queue->rq_qos_mutex);
 
 	memflags = blk_mq_freeze_queue(ctx->bdev->bd_queue);
-	mutex_lock(&ctx->bdev->bd_queue->elevator_lock);
 	mutex_lock(&ctx->bdev->bd_queue->rq_qos_mutex);
 
 	return memflags;
@@ -995,9 +992,8 @@ void blkg_conf_exit(struct blkg_conf_ctx *ctx)
 EXPORT_SYMBOL_GPL(blkg_conf_exit);
 
 /*
- * Similar to blkg_conf_exit, but also unfreezes the queue and releases
- * q->elevator_lock. Should be used when blkg_conf_open_bdev_frozen
- * is used to open the bdev.
+ * Similar to blkg_conf_exit, but also unfreezes the queue. Should be used
+ * when blkg_conf_open_bdev_frozen is used to open the bdev.
  */
 void blkg_conf_exit_frozen(struct blkg_conf_ctx *ctx, unsigned long memflags)
 {
@@ -1005,7 +1001,6 @@ void blkg_conf_exit_frozen(struct blkg_conf_ctx *ctx, unsigned long memflags)
 		struct request_queue *q = ctx->bdev->bd_queue;
 
 		blkg_conf_exit(ctx);
-		mutex_unlock(&q->elevator_lock);
 		blk_mq_unfreeze_queue(q, memflags);
 	}
 }
diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index d06bb137a743..e0bed16485c3 100644
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -557,7 +557,7 @@ int blk_mq_init_sched(struct request_queue *q, struct elevator_type *e,
 	if (blk_mq_is_shared_tags(flags)) {
 		/* Shared tags are stored at index 0 in @et->tags. */
 		q->sched_shared_tags = et->tags[0];
-		blk_mq_tag_update_sched_shared_tags(q);
+		blk_mq_tag_update_sched_shared_tags(q, et->nr_requests);
 	}
 
 	queue_for_each_hw_ctx(q, hctx, i) {
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index c7a4d4b9cc87..5b664dbdf655 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -622,10 +622,11 @@ void blk_mq_tag_resize_shared_tags(struct blk_mq_tag_set *set, unsigned int size
 	sbitmap_queue_resize(&tags->bitmap_tags, size - set->reserved_tags);
 }
 
-void blk_mq_tag_update_sched_shared_tags(struct request_queue *q)
+void blk_mq_tag_update_sched_shared_tags(struct request_queue *q,
+					 unsigned int nr)
 {
 	sbitmap_queue_resize(&q->sched_shared_tags->bitmap_tags,
-			     q->nr_requests - q->tag_set->reserved_tags);
+			     nr - q->tag_set->reserved_tags);
 }
 
 /**
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 09f579414161..d626d32f6e57 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -4941,7 +4941,7 @@ struct elevator_tags *blk_mq_update_nr_requests(struct request_queue *q,
 		 * tags can't grow, see blk_mq_alloc_sched_tags().
 		 */
 		if (q->elevator)
-			blk_mq_tag_update_sched_shared_tags(q);
+			blk_mq_tag_update_sched_shared_tags(q, nr);
 		else
 			blk_mq_tag_resize_shared_tags(set, nr);
 	} else if (!q->elevator) {
diff --git a/block/blk-mq.h b/block/blk-mq.h
index af42dc018808..c4fccdeb5441 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -186,7 +186,8 @@ void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
 void blk_mq_put_tags(struct blk_mq_tags *tags, int *tag_array, int nr_tags);
 void blk_mq_tag_resize_shared_tags(struct blk_mq_tag_set *set,
 		unsigned int size);
-void blk_mq_tag_update_sched_shared_tags(struct request_queue *q);
+void blk_mq_tag_update_sched_shared_tags(struct request_queue *q,
+					 unsigned int nr);
 
 void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_tag_iter_fn *fn,