unsigned long s_size; /* total size (in blocks) of this fs */
signed int s_map2blk; /* shift left by this for map->sector */
unsigned int s_log2sharesize;/* log2 share size */
unsigned long s_size; /* total size (in blocks) of this fs */
signed int s_map2blk; /* shift left by this for map->sector */
unsigned int s_log2sharesize;/* log2 share size */