diff --git a/modules/cas_cache/disk.c b/modules/cas_cache/disk.c
index 9ec7b4a..8ca6056 100644
--- a/modules/cas_cache/disk.c
+++ b/modules/cas_cache/disk.c
@@ -72,8 +72,6 @@ struct cas_disk *cas_disk_open(const char *path)
 		goto error_kmem;
 	}
 
-	mutex_init(&dsk->openers_lock);
-
 	dsk->path = kstrdup(path, GFP_KERNEL);
 	if (!dsk->path) {
 		result = -ENOMEM;
diff --git a/modules/cas_cache/disk.h b/modules/cas_cache/disk.h
index 80c7e3a..7ba1257 100644
--- a/modules/cas_cache/disk.h
+++ b/modules/cas_cache/disk.h
@@ -16,10 +16,6 @@ struct cas_exp_obj;
 struct cas_disk {
 	char *path;
 
-	struct mutex openers_lock;
-	unsigned int openers;
-	bool claimed;
-
 	struct block_device *bd;
 
 	int gd_flags;
diff --git a/modules/cas_cache/exp_obj.c b/modules/cas_cache/exp_obj.c
index 694182e..c08b70f 100644
--- a/modules/cas_cache/exp_obj.c
+++ b/modules/cas_cache/exp_obj.c
@@ -234,32 +234,34 @@ static void _cas_exp_obj_clear_dev_t(struct cas_disk *dsk)
 static int _cas_exp_obj_open(struct block_device *bdev, fmode_t mode)
 {
 	struct cas_disk *dsk = bdev->bd_disk->private_data;
+	struct cas_exp_obj *exp_obj = dsk->exp_obj;
 	int result = -ENAVAIL;
 
-	mutex_lock(&dsk->openers_lock);
+	mutex_lock(&exp_obj->openers_lock);
 
-	if (!dsk->claimed) {
-		if (unlikely(dsk->openers == UINT_MAX)) {
+	if (!exp_obj->claimed) {
+		if (unlikely(exp_obj->openers == UINT_MAX)) {
 			result = -EBUSY;
 		} else {
-			dsk->openers++;
+			exp_obj->openers++;
 			result = 0;
 		}
 	}
 
-	mutex_unlock(&dsk->openers_lock);
+	mutex_unlock(&dsk->exp_obj->openers_lock);
 	return result;
 }
 
 static void _cas_exp_obj_close(struct gendisk *gd, fmode_t mode)
 {
 	struct cas_disk *dsk = gd->private_data;
+	struct cas_exp_obj *exp_obj = dsk->exp_obj;
 
-	BUG_ON(dsk->openers == 0);
+	BUG_ON(exp_obj->openers == 0);
 
-	mutex_lock(&dsk->openers_lock);
-	dsk->openers--;
-	mutex_unlock(&dsk->openers_lock);
+	mutex_lock(&exp_obj->openers_lock);
+	exp_obj->openers--;
+	mutex_unlock(&exp_obj->openers_lock);
 
 }
 
@@ -369,6 +371,8 @@ int cas_exp_obj_create(struct cas_disk *dsk, const char *dev_name,
 
 	exp_obj = dsk->exp_obj;
 
+	mutex_init(&exp_obj->openers_lock);
+
 	exp_obj->dev_name = kstrdup(dev_name, GFP_KERNEL);
 	if (!exp_obj->dev_name) {
 		result = -ENOMEM;
@@ -562,25 +566,29 @@ int cas_exp_obj_lock(struct cas_disk *dsk)
 
 	exp_obj = dsk->exp_obj;
 
-	mutex_lock(&dsk->openers_lock);
+	mutex_lock(&exp_obj->openers_lock);
 
-	if (dsk->openers == 0) {
-		dsk->claimed = true;
+	if (exp_obj->openers == 0) {
+		exp_obj->claimed = true;
 		result = 0;
 	}
 
-	mutex_unlock(&dsk->openers_lock);
+	mutex_unlock(&exp_obj->openers_lock);
 	return result;
 }
 
 int cas_exp_obj_unlock(struct cas_disk *dsk)
 {
+	struct cas_exp_obj *exp_obj;
+
 	BUG_ON(!dsk);
 	CAS_DEBUG_DISK_TRACE(dsk);
 
-	mutex_lock(&dsk->openers_lock);
-	dsk->claimed = false;
-	mutex_unlock(&dsk->openers_lock);
+	exp_obj = dsk->exp_obj;
+
+	mutex_lock(&exp_obj->openers_lock);
+	exp_obj->claimed = false;
+	mutex_unlock(&exp_obj->openers_lock);
 
 	return 0;
 }
diff --git a/modules/cas_cache/exp_obj.h b/modules/cas_cache/exp_obj.h
index cf2c24b..2a280fc 100644
--- a/modules/cas_cache/exp_obj.h
+++ b/modules/cas_cache/exp_obj.h
@@ -39,6 +39,10 @@ struct cas_exp_obj {
 
 	const char *dev_name;
 
+	struct mutex openers_lock;
+	unsigned int openers;
+	bool claimed;
+
 	atomic_t pt_ios;
 	atomic_t *pending_rqs;
 };