BMAP_CHUNK_WORDS
cp->c_bmp = ndmp_malloc(sizeof (uint_t) * BMAP_CHUNK_WORDS);
uint_t buf[BMAP_CHUNK_WORDS];
cp->c_bmp = ndmp_malloc(sizeof (uint_t) * BMAP_CHUNK_WORDS);
#define BMAP_CHUNK_BYTES (BMAP_CHUNK_WORDS * BMAP_WSIZE)
#define BMAP_CHUNK_BITS (BMAP_CHUNK_WORDS * BMAP_BPW)