dax_read_lock
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
EXPORT_SYMBOL_GPL(dax_read_lock);
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
id = dax_read_lock();
int dax_read_lock(void);