You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: btrfs.go
    path of file: ./repos/octant/vendor/github.com/containers/storage/drivers/btrfs
    
    the code of the file until where you have to start completion: // +build linux,cgo

package btrfs

/*
#include <stdlib.h>
#include <dirent.h>
#include <btrfs/ioctl.h>
#include <btrfs/ctree.h>

static void set_name_btrfs_ioctl_vol_args_v2(struct btrfs_ioctl_vol_args_v2* btrfs_str
    
func (d *Driver) updateQuotaStatus() {
	d.once.Do(func() {
		if !d.quotaEnabled {
			// In case quotaEnabled is not set, check qgroup and update quotaEnabled as needed
			if err := qgroupStatus(d.home); err != nil {
				// quota is still not enabled
				return
			}
			d.quotaEnabled = true
		}
	})
}