[Linux-kernel-mentees] [RFC v2 2/2] fs: ext4: Modify inode-test.c to use KUnit parameterized testing

[Arpitha Raghunandan <98.arpi@gmail.com>]

Modifies fs/ext4/inode-test.c to use the parameterized testing
feature of KUnit.

Signed-off-by: Arpitha Raghunandan <98.arpi@gmail.com>
---
 fs/ext4/inode-test.c | 65 ++++++++++++++++++++++++++------------------
 1 file changed, 39 insertions(+), 26 deletions(-)

diff --git a/fs/ext4/inode-test.c b/fs/ext4/inode-test.c
index d62d802c9c12..f127f9123cc1 100644
--- a/fs/ext4/inode-test.c
+++ b/fs/ext4/inode-test.c
@@ -72,6 +72,8 @@
 #define UPPER_BOUND_NONNEG_EXTRA_BITS_1_CASE\
 	"2446-05-10 Upper bound of 32bit >=0 timestamp. All extra sec bits on"
 
+#define NUMBER_OF_TESTCASES 16
+
 struct timestamp_expectation {
 	const char *test_case_name;
 	struct timespec64 expected;
@@ -101,7 +103,40 @@ static time64_t get_32bit_time(const struct timestamp_expectation * const test)
  */
 static void inode_test_xtimestamp_decoding(struct kunit *test)
 {
-	const struct timestamp_expectation test_data[] = {
+	struct timespec64 timestamp;
+	int i;
+
+	for (i = 0; i < NUMBER_OF_TESTCASES; ++i) {
+		struct timestamp_expectation *test_case = (struct timestamp_expectation *)get_test_case_parameters(test);
+
+		timestamp.tv_sec = get_32bit_time(test_case);
+		ext4_decode_extra_time(&timestamp,
+				       cpu_to_le32(test_case->extra_bits));
+
+		KUNIT_EXPECT_EQ_MSG(test,
+				    test_case->expected.tv_sec,
+				    timestamp.tv_sec,
+				    CASE_NAME_FORMAT,
+				    test_case->test_case_name,
+				    test_case->msb_set,
+				    test_case->lower_bound,
+				    test_case->extra_bits);
+		KUNIT_EXPECT_EQ_MSG(test,
+				    test_case->expected.tv_nsec,
+				    timestamp.tv_nsec,
+				    CASE_NAME_FORMAT,
+				    test_case->test_case_name,
+				    test_case->msb_set,
+				    test_case->lower_bound,
+				    test_case->extra_bits);
+	}
+}
+
+struct timestamp_expectation *get_test_parameters(void)
+{
+	struct timestamp_expectation *test_data = (struct timestamp_expectation *)kmalloc(sizeof(struct timestamp_expectation) * NUMBER_OF_TESTCASES, GFP_KERNEL);
+
+	const struct timestamp_expectation test_data_init[] = {
 		{
 			.test_case_name = LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE,
 			.msb_set = true,
@@ -232,35 +267,13 @@ static void inode_test_xtimestamp_decoding(struct kunit *test)
 		}
 	};
 
-	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));
+	memcpy(test_data, test_data_init, sizeof(struct timestamp_expectation) * ARRAY_SIZE(test_data_init));
 
-		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);
-	}
+	return test_data;
 }
 
 static struct kunit_case ext4_inode_test_cases[] = {
-	KUNIT_CASE(inode_test_xtimestamp_decoding),
+	KUNIT_CASE_PARAM(inode_test_xtimestamp_decoding, get_test_parameters, NUMBER_OF_TESTCASES, sizeof(struct timestamp_expectation)),
 	{}
 };
 
-- 
2.25.1

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