--- x/fs/btrfs/volumes.h
+++ y/fs/btrfs/volumes.h
@@ -348,6 +348,7 @@ struct btrfs_fs_devices {
 
 	/* Count fs-devices opened. */
 	int opened;
+	int user;
 
 	/* Set when we find or add a device that doesn't have the nonrot flag set. */
 	bool rotating;
--- x/fs/btrfs/volumes.c
+++ y/fs/btrfs/volumes.c
@@ -406,6 +406,8 @@ static void free_fs_devices(struct btrfs
 	struct btrfs_device *device;
 
 	WARN_ON(fs_devices->opened);
+	if (fs_devices->user)
+		return;
 	while (!list_empty(&fs_devices->devices)) {
 		device = list_entry(fs_devices->devices.next,
 				    struct btrfs_device, dev_list);
--- x/fs/btrfs/super.c
+++ y/fs/btrfs/super.c
@@ -1443,6 +1443,7 @@ static struct dentry *btrfs_mount_root(s
 	struct btrfs_fs_info *fs_info = NULL;
 	void *new_sec_opts = NULL;
 	int error = 0;
+	struct btrfs_fs_devices *fs_devices = NULL;
 
 	if (data) {
 		error = security_sb_eat_lsm_opts(data, &new_sec_opts);
@@ -1486,13 +1487,15 @@ static struct dentry *btrfs_mount_root(s
 		goto error_fs_info;
 	}
 	fs_info->fs_devices = device->fs_devices;
+	fs_info->fs_devices->user++;
+	fs_devices = fs_info->fs_devices;
 	mutex_unlock(&uuid_mutex);
 
 	s = sget(fs_type, btrfs_test_super, btrfs_set_super, flags | SB_NOSEC,
 		 fs_info);
 	if (IS_ERR(s)) {
 		error = PTR_ERR(s);
-		goto error_fs_info;
+		goto error_close_devices;
 	}
 
 	if (s->s_root) {
@@ -1500,15 +1503,12 @@ static struct dentry *btrfs_mount_root(s
 		if ((flags ^ s->s_flags) & SB_RDONLY)
 			error = -EBUSY;
 	} else {
-		struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
-
 		error = btrfs_open_devices(fs_devices, sb_open_mode(flags), s);
 		if (error)
 			goto out_deactivate;
 
 		if (!(flags & SB_RDONLY) && fs_devices->rw_devices == 0) {
 			error = -EACCES;
-			btrfs_close_devices(fs_info->fs_devices);
 			goto out_deactivate;
 		}
 
@@ -1524,16 +1524,26 @@ static struct dentry *btrfs_mount_root(s
 	if (error)
 		goto out_deactivate;
 	security_free_mnt_opts(&new_sec_opts);
+	mutex_lock(&uuid_mutex);
+	fs_devices->user--;
+	mutex_unlock(&uuid_mutex);
 	return dget(s->s_root);
 
 out_deactivate:
 	deactivate_locked_super(s);
 error_sec_opts:
 	security_free_mnt_opts(&new_sec_opts);
-	return ERR_PTR(error);
+error_close_devices:
+	if (!fs_devices)
+		goto error_fs_info;
+	mutex_lock(&uuid_mutex);
+	fs_devices->user--;
+	mutex_unlock(&uuid_mutex);
+	btrfs_close_devices(fs_devices);
 error_fs_info:
-	btrfs_free_fs_info(fs_info);
-	goto error_sec_opts;
+	if (fs_info)
+		btrfs_free_fs_info(fs_info);
+	return ERR_PTR(error);
 }
 
 /*