btrfs: Document a mutex lock/unlock sequence (8cc33e5c) · Commits · e / devices / android_kernel_xiaomi_markw

fs/btrfs/extent-tree.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -756,6 +756,10 @@ again:

		btrfs_release_path(path);

		/*
		* Mutex was contended, block until it's released and try
		* again
		*/
		mutex_lock(&head->mutex);
		mutex_unlock(&head->mutex);
		btrfs_put_delayed_ref(&head->node);
		@@ -2297,6 +2301,10 @@ again:
		atomic_inc(&ref->refs);

		spin_unlock(&delayed_refs->lock);
		/*
		* Mutex was contended, block until it's
		* released and try again
		*/
		mutex_lock(&head->mutex);
		mutex_unlock(&head->mutex);

		@@ -2363,6 +2371,10 @@ static noinline int check_delayed_ref(struct btrfs_trans_handle *trans,

		btrfs_release_path(path);

		/*
		* Mutex was contended, block until it's released and let
		* caller try again
		*/
		mutex_lock(&head->mutex);
		mutex_unlock(&head->mutex);
		btrfs_put_delayed_ref(&head->node);