Man pages matching name gfs_unlink in section 3:

gfs_unlink.3.en	debian 11 / libgfarm-dev
gfs_unlink.3.ja	debian 11 / libgfarm-dev
gfs_unlink.3.en	debian 12 / libgfarm-dev
gfs_unlink.3.ja	debian 12 / libgfarm-dev