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Sat, 18 Apr 2026 09:34:12 -0700 (PDT) Received: from localhost ([2a01:4b00:d036:ae00:e054:93f2:97bf:84c6]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-43fe4e46898sm14205702f8f.27.2026.04.18.09.34.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 18 Apr 2026 09:34:12 -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 v8 4/6] selftests/liveupdate: add test case for LUO_SESSION_MAGIC Date: Sat, 18 Apr 2026 17:28:21 +0100 Message-ID: <20260418163358.2304490-5-luca.boccassi@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260418163358.2304490-1-luca.boccassi@gmail.com> References: <20260418163358.2304490-1-luca.boccassi@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260418_093416_161495_0D5CDD2D X-CRM114-Status: GOOD ( 10.79 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org 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 Reviewed-by: Pasha Tatashin --- .../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 f0a8e600c154..5e99af0cc6e9 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" @@ -387,4 +390,41 @@ TEST_F(liveupdate_device, create_session_empty_name) EXPECT_EQ(session_fd, -EINVAL); } +/* + * 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