top_begin_async
(void) top_begin_async(ufsvfsp, vid, vsize, 0); \
err = top_begin_async(ufsvfsp, vid, vsize, 1); \
(void) top_begin_async(ufsvfsp, vid, vsize, 0); \
(void) top_begin_async(ufsvfsp, vid, vsize, 0); \
error = top_begin_async(ufsvfsp, vid, vsize, 1); \
int top_begin_async(struct ufsvfs *ufsvfsp, top_t topid, ulong_t size,