getzfsvfs
extern int getzfsvfs(const char *, struct zfsvfs **);
if (getzfsvfs(name, zfvp) != 0)
int err = getzfsvfs(snapname, &zfsvfs);
if (getzfsvfs(fsname, &zfsvfs) == 0) {
if (getzfsvfs(tofs, &zfsvfs) == 0) {
if (getzfsvfs(zc->zc_name, &zfsvfs) == 0) {