zfs_link_destroy
extern int zfs_link_destroy(zfs_dirlock_t *, znode_t *, dmu_tx_t *, int,
error = zfs_link_destroy(&dl, xzp, tx, 0, NULL);
error = zfs_link_destroy(dl, zp, tx, zflg, &unlinked);
error = zfs_link_destroy(dl, zp, tx, zflg, NULL);
error = rm_err = zfs_link_destroy(tdl, tzp, tx, zflg, NULL);
error = zfs_link_destroy(sdl, szp, tx, ZRENAMING, NULL);
VERIFY3U(zfs_link_destroy(tdl, szp, tx,