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Fri, 17 Apr 2026 13:58:26 -0700 (PDT) From: luca.boccassi@gmail.com To: kexec@lists.infradead.org Cc: linux-mm@kvack.org, graf@amazon.com, rppt@kernel.org, pasha.tatashin@soleen.com, pratyush@kernel.org, brauner@kernel.org, linux-kernel@vger.kernel.org, Luca Boccassi Subject: [PATCH v4 2/2] selftests/liveupdate: add test case for LUO_SESSION_MAGIC Date: Fri, 17 Apr 2026 21:57:21 +0100 Message-ID: <20260417205810.1831923-2-luca.boccassi@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260417205810.1831923-1-luca.boccassi@gmail.com> References: <20260417205810.1831923-1-luca.boccassi@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Luca Boccassi Verify that fstat works as expected after the switch from anon_inode to the new magic number. Signed-off-by: Luca Boccassi --- v4: split test case in separate patch, reorder variable declarations .../testing/selftests/liveupdate/liveupdate.c | 40 +++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/tools/testing/selftests/liveupdate/liveupdate.c b/tools/testing/selftests/liveupdate/liveupdate.c index bdc1cedc4f944..3c21352f023a7 100644 --- a/tools/testing/selftests/liveupdate/liveupdate.c +++ b/tools/testing/selftests/liveupdate/liveupdate.c @@ -22,9 +22,12 @@ #include #include #include +#include +#include #include #include +#include #include "../kselftest.h" #include "../kselftest_harness.h" @@ -416,4 +419,41 @@ TEST_F(liveupdate_device, get_session_name_max_length) ASSERT_EQ(close(session_fd), 0); } +/* + * Test Case: Session fstat + * + * Verifies that fstatfs() on a session file descriptor reports the + * LUO_SESSION_MAGIC filesystem type, and that fstat() returns consistent + * inode numbers across different sessions (shared singleton inode). + */ +TEST_F(liveupdate_device, session_fstat) +{ + int session_fd1, session_fd2; + struct stat st1, st2; + struct statfs sfs; + + self->fd1 = open(LIVEUPDATE_DEV, O_RDWR); + if (self->fd1 < 0 && errno == ENOENT) + SKIP(return, "%s does not exist", LIVEUPDATE_DEV); + ASSERT_GE(self->fd1, 0); + + session_fd1 = create_session(self->fd1, "fstat-session-1"); + ASSERT_GE(session_fd1, 0); + + session_fd2 = create_session(self->fd1, "fstat-session-2"); + ASSERT_GE(session_fd2, 0); + + /* Verify the filesystem type is LUO_SESSION_MAGIC */ + ASSERT_EQ(fstatfs(session_fd1, &sfs), 0); + EXPECT_EQ(sfs.f_type, LUO_SESSION_MAGIC); + + /* Verify both sessions share the same inode number */ + ASSERT_EQ(fstat(session_fd1, &st1), 0); + ASSERT_EQ(fstat(session_fd2, &st2), 0); + EXPECT_EQ(st1.st_ino, st2.st_ino); + + ASSERT_EQ(close(session_fd1), 0); + ASSERT_EQ(close(session_fd2), 0); +} + TEST_HARNESS_MAIN -- 2.47.3