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* [PATCH linux-kselftest/test v2] ext4: add kunit test for decoding extended timestamps
@ 2019-10-10  2:39 Iurii Zaikin
  2019-10-10  3:46 ` Tim.Bird
  2019-10-10 17:11 ` Shuah Khan
  0 siblings, 2 replies; 34+ messages in thread
From: Iurii Zaikin @ 2019-10-10  2:39 UTC (permalink / raw)
  To: linux-kselftest, linux-ext4, skhan, tytso, adilger.kernel
  Cc: kunit-dev, brendanhiggins, Iurii Zaikin

KUnit tests for decoding extended 64 bit timestamps.

Signed-off-by: Iurii Zaikin <yzaikin@google.com>
---
 fs/ext4/Kconfig      |  12 +++
 fs/ext4/Makefile     |   1 +
 fs/ext4/inode-test.c | 221 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 234 insertions(+)
 create mode 100644 fs/ext4/inode-test.c

diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
index cbb5ca830e57..cb0b52753674 100644
--- a/fs/ext4/Kconfig
+++ b/fs/ext4/Kconfig
@@ -106,3 +106,15 @@ config EXT4_DEBUG
 	  If you select Y here, then you will be able to turn on debugging
 	  with a command such as:
 		echo 1 > /sys/module/ext4/parameters/mballoc_debug
+
+config EXT4_KUNIT_TESTS
+	bool "KUnit test for ext4 inode"
+	depends on EXT4_FS
+	depends on KUNIT
+	help
+	  This builds the ext4 inode sysctl unit test, which runs on boot.
+	  Tests the encoding correctness of ext4 inode.
+	  For more information on KUnit and unit tests in general please refer
+	  to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+	  If unsure, say N.
diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile
index b17ddc229ac5..a0588fd2eea6 100644
--- a/fs/ext4/Makefile
+++ b/fs/ext4/Makefile
@@ -13,4 +13,5 @@ ext4-y	:= balloc.o bitmap.o block_validity.o dir.o ext4_jbd2.o extents.o \

 ext4-$(CONFIG_EXT4_FS_POSIX_ACL)	+= acl.o
 ext4-$(CONFIG_EXT4_FS_SECURITY)		+= xattr_security.o
+ext4-$(CONFIG_EXT4_KUNIT_TESTS)	+= inode-test.o
 ext4-$(CONFIG_FS_VERITY)		+= verity.o
diff --git a/fs/ext4/inode-test.c b/fs/ext4/inode-test.c
new file mode 100644
index 000000000000..43bc6cb547cd
--- /dev/null
+++ b/fs/ext4/inode-test.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test of ext4 inode that verify the seconds part of [a/c/m]
+ * timestamps in ext4 inode structs are decoded correctly.
+ * These tests are derived from the table under
+ * Documentation/filesystems/ext4/inodes.rst Inode Timestamps
+ */
+
+#include <kunit/test.h>
+#include <linux/kernel.h>
+#include <linux/time64.h>
+
+#include "ext4.h"
+
+/* binary: 00000000 00000000 00000000 00000000 */
+#define LOWER_MSB_0 0L
+/* binary: 01111111 11111111 11111111 11111111 */
+#define UPPER_MSB_0 0x7fffffffL
+/* binary: 10000000 00000000 00000000 00000000 */
+#define LOWER_MSB_1 (-0x80000000L)
+/* binary: 11111111 11111111 11111111 11111111 */
+#define UPPER_MSB_1 (-1L)
+/* binary: 00111111   11111111 11111111 11111111 */
+#define MAX_NANOSECONDS ((1L << 30) - 1)
+
+#define CASE_NAME_FORMAT "%s: msb:%x lower_bound:%x extra_bits: %x"
+
+struct timestamp_expectation {
+	const char *test_case_name;
+	struct timespec64 expected;
+	u32 extra_bits;
+	bool msb_set;
+	bool lower_bound;
+};
+
+static time64_t get_32bit_time(const struct timestamp_expectation * const test)
+{
+	if (test->msb_set) {
+		if (test->lower_bound)
+			return LOWER_MSB_1;
+
+		return UPPER_MSB_1;
+	}
+
+	if (test->lower_bound)
+		return LOWER_MSB_0;
+	return UPPER_MSB_0;
+}
+
+
+static void inode_test_xtimestamp_decoding(struct kunit *test)
+{
+	const struct timestamp_expectation test_data[] = {
+		{
+			.test_case_name = "1901-12-13",
+			.msb_set = true,
+			.lower_bound = true,
+			.extra_bits = 0,
+			.expected = {.tv_sec = -0x80000000LL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "1969-12-31",
+			.msb_set = true,
+			.lower_bound = false,
+			.extra_bits = 0,
+			.expected = {.tv_sec = -1LL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "1970-01-01",
+			.msb_set = false,
+			.lower_bound = true,
+			.extra_bits = 0,
+			.expected = {0LL, 0L},
+		},
+
+		{
+			.test_case_name = "2038-01-19",
+			.msb_set = false,
+			.lower_bound = false,
+			.extra_bits = 0,
+			.expected = {.tv_sec = 0x7fffffffLL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "2038-01-19",
+			.msb_set = true,
+			.lower_bound = true,
+			.extra_bits = 1,
+			.expected = {.tv_sec = 0x80000000LL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "2106-02-07",
+			.msb_set = true,
+			.lower_bound = false,
+			.extra_bits = 1,
+			.expected = {.tv_sec = 0xffffffffLL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "2106-02-07",
+			.msb_set = false,
+			.lower_bound = true,
+			.extra_bits = 1,
+			.expected = {.tv_sec = 0x100000000LL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "2174-02-25",
+			.msb_set = false,
+			.lower_bound = false,
+			.extra_bits = 1,
+			.expected = {.tv_sec = 0x17fffffffLL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "2174-02-25",
+			.msb_set = true,
+			.lower_bound = true,
+			.extra_bits =  2,
+			.expected = {.tv_sec = 0x180000000LL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "2242-03-16",
+			.msb_set = true,
+			.lower_bound = false,
+			.extra_bits = 2,
+			.expected = {.tv_sec = 0x1ffffffffLL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "2242-03-16",
+			.msb_set = false,
+			.lower_bound = true,
+			.extra_bits = 2,
+			.expected = {.tv_sec = 0x200000000LL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = " 2310-04-04",
+			.msb_set = false,
+			.lower_bound = false,
+			.extra_bits = 2,
+			.expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = " 2310-04-04 00:00:00.1",
+			.msb_set = false,
+			.lower_bound = false,
+			.extra_bits = 6,
+			.expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 1L},
+		},
+
+		{
+			.test_case_name = "2378-04-22 00:00:00.MAX_NSEC",
+			.msb_set = false,
+			.lower_bound = true,
+			.extra_bits = 0xFFFFFFFF,
+			.expected = {.tv_sec = 0x300000000LL,
+				     .tv_nsec = MAX_NANOSECONDS},
+		},
+
+		{
+			.test_case_name = "2378-04-22",
+			.msb_set = false,
+			.lower_bound = true,
+			.extra_bits = 3,
+			.expected = {.tv_sec = 0x300000000LL, .tv_nsec = 0L},
+		},
+
+		{
+			.test_case_name = "2446-05-10",
+			.msb_set = false,
+			.lower_bound = false,
+			.extra_bits = 3,
+			.expected = {.tv_sec = 0x37fffffffLL, .tv_nsec = 0L},
+		}
+	};
+
+	struct timespec64 timestamp;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(test_data); ++i) {
+		timestamp.tv_sec = get_32bit_time(&test_data[i]);
+		ext4_decode_extra_time(&timestamp,
+				       cpu_to_le32(test_data[i].extra_bits));
+
+		KUNIT_EXPECT_EQ_MSG(test,
+				    test_data[i].expected.tv_sec,
+				    timestamp.tv_sec,
+				    CASE_NAME_FORMAT,
+				    test_data[i].test_case_name,
+				    test_data[i].msb_set,
+				    test_data[i].lower_bound,
+				    test_data[i].extra_bits);
+		KUNIT_EXPECT_EQ_MSG(test,
+				    test_data[i].expected.tv_nsec,
+				    timestamp.tv_nsec,
+				    CASE_NAME_FORMAT,
+				    test_data[i].test_case_name,
+				    test_data[i].msb_set,
+				    test_data[i].lower_bound,
+				    test_data[i].extra_bits);
+	}
+}
+
+static struct kunit_case ext4_inode_test_cases[] = {
+	KUNIT_CASE(inode_test_xtimestamp_decoding),
+	{}
+};
+
+static struct kunit_suite ext4_inode_test_suite = {
+	.name = "ext4_inode_test",
+	.test_cases = ext4_inode_test_cases,
+};
+
+kunit_test_suite(ext4_inode_test_suite);
--
2.23.0.700.g56cf767bdb-goog

^ permalink raw reply related	[flat|nested] 34+ messages in thread

end of thread, other threads:[~2019-10-24  1:30 UTC | newest]

Thread overview: 34+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-10  2:39 [PATCH linux-kselftest/test v2] ext4: add kunit test for decoding extended timestamps Iurii Zaikin
2019-10-10  3:46 ` Tim.Bird
2019-10-10 16:45   ` Iurii Zaikin
2019-10-10 20:29     ` Tim.Bird
2019-10-10 23:49       ` Iurii Zaikin
2019-10-10 17:11 ` Shuah Khan
2019-10-10 22:13   ` Iurii Zaikin
2019-10-11 10:05     ` Brendan Higgins
2019-10-11 13:19       ` Theodore Y. Ts'o
2019-10-12  2:38         ` Iurii Zaikin
2019-10-16 22:18         ` Brendan Higgins
2019-10-16 23:26           ` Shuah Khan
2019-10-17  0:07             ` Iurii Zaikin
2019-10-17 12:08             ` Theodore Y. Ts'o
2019-10-17 22:25               ` Tim.Bird
2019-10-17 22:56                 ` Theodore Y. Ts'o
2019-10-17 23:40                   ` Tim.Bird
2019-10-18  1:40                     ` Theodore Y. Ts'o
2019-10-18  2:40                       ` Tim.Bird
2019-10-18 15:27                         ` Theodore Y. Ts'o
2019-10-18 20:24                           ` Shuah Khan
2019-10-24  1:30                             ` Brendan Higgins
2019-10-18  1:12                 ` Brendan Higgins
2019-10-18  1:30                   ` Tim.Bird
2019-10-17 22:49               ` Shuah Khan
2019-10-17 23:07                 ` Iurii Zaikin
2019-10-17 23:12                   ` Shuah Khan
2019-10-17 23:27                     ` Iurii Zaikin
2019-10-17 23:42                       ` Shuah Khan
2019-10-17 23:54                       ` Tim.Bird
2019-10-17 23:59                         ` Shuah Khan
2019-10-18  0:11                         ` Iurii Zaikin
2019-10-18  0:38                           ` Tim.Bird
2019-10-18  1:06                             ` Iurii Zaikin

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