nvpair_find
nvp_header_t *nvpair_find(nvlist_t *, const char *);
nvpair_find(nv, name));
nvh = nvpair_find(nv, name);
if (nvpair_find(nvl, key) != NULL)
if (nvpair_find(zfs->rootdsldir->propsnv, "compression") == NULL) {
if (nvpair_find(zfs->rootdsldir->propsnv, "mountpoint") == NULL) {