From nobody Sat Feb 7 06:14:37 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 924A437EE33; Wed, 29 Oct 2025 12:24:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761740646; cv=none; b=hpKpkpeZpeQTAhA8vCwg/WIhESejZI9ga0gXPTinWkl7VyQ05/W2Ysb43zL1CG2YjjUBwejRYYC9eWaLpDc4u9Wp9PM/dJLgt90jB5NkscXFR/pQh7m2ka6nsCbq1qBzYEwS3CD8/z0HOgvbZ7onzrwAmpXrXmykkAUKdnX72u0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761740646; c=relaxed/simple; bh=16wgRCEaRGE6KnaGWYUsE3X1jinLIZr1ZBK0aXw4RfM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=qhRkqisLsiC9sPuj9TGGKaYiRGIuqZY0NzJmiQ0V7v+TsMZMeRBU+Sx0KkFwthSHkSVY0g+woJzsg/sOGgy2wUORyyffPJQbDsBClwL59LHdWhqudDpWJedt252Uayc5ZiNe9Udwn8EKXJ9ouQIgznowqJIt/ic7xjLuDHexWto= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CLdVo4E9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CLdVo4E9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA1CFC4CEFD; Wed, 29 Oct 2025 12:24:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761740646; bh=16wgRCEaRGE6KnaGWYUsE3X1jinLIZr1ZBK0aXw4RfM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=CLdVo4E9M/dqLQGToUZ6fWm1RRkYcoALofiF3C9/XuujKUBAnd7GSJIau/CkS3UVy c3QSpEzcRW1J7PMXMOIeyrIw1d6xkuqS5KPty/dezN2ipxdMrL7jY1UKU5EO8+NE5U eYAdV7cuhotX/6Yw5a5cbAdl6Gnb4GyjlXohCBTVt20MIrSGH8336zyJhROmLgF8tR AqmKshp5w3vziVjBWvqbQDdwbrJ/Q1eUFaV/SQqMEIQhQJNdUmO3kNHFiz2xxDfbT6 tvd0pUwijDF5NsxSfnQg0+5O28O/JlaNXWe3NLCrBdl2ewM3PTMJal9HRiTeZm1Qzv 4V/LCxKg+O/zg== From: Christian Brauner Date: Wed, 29 Oct 2025 13:20:54 +0100 Subject: [PATCH v4 41/72] selftests/namespaces: third listns() test Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251029-work-namespace-nstree-listns-v4-41-2e6f823ebdc0@kernel.org> References: <20251029-work-namespace-nstree-listns-v4-0-2e6f823ebdc0@kernel.org> In-Reply-To: <20251029-work-namespace-nstree-listns-v4-0-2e6f823ebdc0@kernel.org> To: linux-fsdevel@vger.kernel.org, Josef Bacik , Jeff Layton Cc: Jann Horn , Mike Yuan , =?utf-8?q?Zbigniew_J=C4=99drzejewski-Szmek?= , Lennart Poettering , Daan De Meyer , Aleksa Sarai , Amir Goldstein , Tejun Heo , Johannes Weiner , Thomas Gleixner , Alexander Viro , Jan Kara , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, Eric Dumazet , Jakub Kicinski , netdev@vger.kernel.org, Arnd Bergmann , Christian Brauner X-Mailer: b4 0.15-dev-96507 X-Developer-Signature: v=1; a=openpgp-sha256; l=2006; i=brauner@kernel.org; h=from:subject:message-id; bh=16wgRCEaRGE6KnaGWYUsE3X1jinLIZr1ZBK0aXw4RfM=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWQysfWtL+jccsjOtda3ZU5I7ywrZf0awZigq3JFc+S/p qf/FEjrKGVhEONikBVTZHFoNwmXW85TsdkoUwNmDisTyBAGLk4BmMiKdYwM26+4uz5auyhv/pSz MyfNkFx4TeWU277DETtibuxkm2+UtJHhv+eky07dRpYeG09O3HjN+bb95GeXavVdcorKmVf+aj+ 2lg0A X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Test listns() pagination. List namespaces in batches. Signed-off-by: Christian Brauner --- tools/testing/selftests/namespaces/listns_test.c | 53 ++++++++++++++++++++= ++++ 1 file changed, 53 insertions(+) diff --git a/tools/testing/selftests/namespaces/listns_test.c b/tools/testi= ng/selftests/namespaces/listns_test.c index 64249502ac49..7dff63a00263 100644 --- a/tools/testing/selftests/namespaces/listns_test.c +++ b/tools/testing/selftests/namespaces/listns_test.c @@ -115,4 +115,57 @@ TEST(listns_filter_by_type) } } =20 +/* + * Test listns() pagination. + * List namespaces in batches. + */ +TEST(listns_pagination) +{ + struct ns_id_req req =3D { + .size =3D sizeof(req), + .spare =3D 0, + .ns_id =3D 0, + .ns_type =3D 0, + .spare2 =3D 0, + .user_ns_id =3D 0, + }; + __u64 batch1[2], batch2[2]; + ssize_t ret1, ret2; + + /* Get first batch */ + ret1 =3D sys_listns(&req, batch1, ARRAY_SIZE(batch1), 0); + if (ret1 < 0) { + if (errno =3D=3D ENOSYS) + SKIP(return, "listns() not supported"); + TH_LOG("listns failed: %s (errno=3D%d)", strerror(errno), errno); + ASSERT_TRUE(false); + } + ASSERT_GE(ret1, 0); + + if (ret1 =3D=3D 0) + SKIP(return, "No namespaces found"); + + TH_LOG("First batch: %zd namespaces", ret1); + + /* Get second batch using last ID from first batch */ + if (ret1 =3D=3D ARRAY_SIZE(batch1)) { + req.ns_id =3D batch1[ret1 - 1]; + ret2 =3D sys_listns(&req, batch2, ARRAY_SIZE(batch2), 0); + ASSERT_GE(ret2, 0); + + TH_LOG("Second batch: %zd namespaces (after ns_id=3D%llu)", + ret2, (unsigned long long)req.ns_id); + + /* If we got more results, verify IDs are monotonically increasing */ + if (ret2 > 0) { + ASSERT_GT(batch2[0], batch1[ret1 - 1]); + TH_LOG("Pagination working: %llu > %llu", + (unsigned long long)batch2[0], + (unsigned long long)batch1[ret1 - 1]); + } + } else { + TH_LOG("All namespaces fit in first batch"); + } +} + TEST_HARNESS_MAIN --=20 2.47.3