[PATCHv3 6/7] block: protect wbt_lat_usec using q->elevator_lock

[Nilay Shroff <nilay@linux.ibm.com>]

The wbt latency and state could be updated while initializing the
elevator or exiting the elevator. It could be also updates while
configuring IO latency QoS parameters using cgroup. The elevator
code path is now protected with q->elevator_lock. So we should
protect the access to sysfs attribute wbt_lat_usec using q->elevator
_lock instead of q->sysfs_lock. White we're at it, also protect
ioc_qos_write(), which configures wbt parameters via cgroup, using
q->elevator_lock.

Signed-off-by: Nilay Shroff <nilay@linux.ibm.com>
---
 block/blk-iocost.c |  2 ++
 block/blk-sysfs.c  | 20 ++++++++------------
 2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 65a1d4427ccf..c68373361301 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3249,6 +3249,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
 	}
 
 	memflags = blk_mq_freeze_queue(disk->queue);
+	mutex_lock(&disk->queue->elevator_lock);
 	blk_mq_quiesce_queue(disk->queue);
 
 	spin_lock_irq(&ioc->lock);
@@ -3356,6 +3357,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
 	spin_unlock_irq(&ioc->lock);
 
 	blk_mq_unquiesce_queue(disk->queue);
+	mutex_unlock(&disk->queue->elevator_lock);
 	blk_mq_unfreeze_queue(disk->queue, memflags);
 
 	ret = -EINVAL;
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 1ca0938b2fd7..8f47d9f30fbf 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -557,7 +557,7 @@ static ssize_t queue_wb_lat_show(struct gendisk *disk, char *page)
 	ssize_t ret;
 	struct request_queue *q = disk->queue;
 
-	mutex_lock(&q->sysfs_lock);
+	mutex_lock(&q->elevator_lock);
 	if (!wbt_rq_qos(q)) {
 		ret = -EINVAL;
 		goto out;
@@ -570,7 +570,7 @@ static ssize_t queue_wb_lat_show(struct gendisk *disk, char *page)
 
 	ret = sysfs_emit(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000));
 out:
-	mutex_unlock(&q->sysfs_lock);
+	mutex_unlock(&q->elevator_lock);
 	return ret;
 }
 
@@ -589,8 +589,8 @@ static ssize_t queue_wb_lat_store(struct gendisk *disk, const char *page,
 	if (val < -1)
 		return -EINVAL;
 
-	mutex_lock(&q->sysfs_lock);
 	memflags = blk_mq_freeze_queue(q);
+	mutex_lock(&q->elevator_lock);
 
 	rqos = wbt_rq_qos(q);
 	if (!rqos) {
@@ -619,8 +619,8 @@ static ssize_t queue_wb_lat_store(struct gendisk *disk, const char *page,
 
 	blk_mq_unquiesce_queue(q);
 out:
+	mutex_unlock(&q->elevator_lock);
 	blk_mq_unfreeze_queue(q, memflags);
-	mutex_unlock(&q->sysfs_lock);
 
 	return ret;
 }
@@ -689,19 +689,15 @@ static struct attribute *queue_attrs[] = {
 
 /* Request-based queue attributes that are not relevant for bio-based queues. */
 static struct attribute *blk_mq_queue_attrs[] = {
-	/*
-	 * attributes protected with q->sysfs_lock
-	 */
-#ifdef CONFIG_BLK_WBT
-	&queue_wb_lat_entry.attr,
-#endif
 	/*
 	 * attributes which require some form of locking
 	 * other than q->sysfs_lock
 	 */
 	&elv_iosched_entry.attr,
 	&queue_requests_entry.attr,
-
+#ifdef CONFIG_BLK_WBT
+	&queue_wb_lat_entry.attr,
+#endif
 	/*
 	 * attributes which don't require locking
 	 */
@@ -882,10 +878,10 @@ int blk_register_queue(struct gendisk *disk)
 			goto out_crypto_sysfs_unregister;
 		}
 	}
+	wbt_enable_default(disk);
 	mutex_unlock(&q->elevator_lock);
 
 	blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);
-	wbt_enable_default(disk);
 
 	/* Now everything is ready and send out KOBJ_ADD uevent */
 	kobject_uevent(&disk->queue_kobj, KOBJ_ADD);
-- 
2.47.1