// 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. */ #include <kunit/test.h>#include <linux/kernel.h>#include <linux/time64.h> #include "ext4.h" /* * For constructing the nonnegative timestamp lower bound value. * binary: 00000000 00000000 00000000 00000000 */#define LOWER_MSB_0 0L/* * For constructing the nonnegative timestamp upper bound value. * binary: 01111111 11111111 11111111 11111111 * */#define UPPER_MSB_0 0x7fffffffL/* * For constructing the negative timestamp lower bound value. * binary: 10000000 00000000 00000000 00000000 */#define LOWER_MSB_1 (-(UPPER_MSB_0) - 1L)  /* avoid overflow *//* * For constructing the negative timestamp upper bound value. * binary: 11111111 11111111 11111111 11111111 */#define UPPER_MSB_1 (-1L)/* * Upper bound for nanoseconds value supported by the encoding. * binary: 00111111 11111111 11111111 11111111 */#define MAX_NANOSECONDS ((1L << 30) - 1) #define CASE_NAME_FORMAT "%s: msb:%x lower_bound:%x extra_bits: %x" #define LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE\	"1901-12-13 Lower bound of 32bit < 0 timestamp, no extra bits"#define UPPER_BOUND_NEG_NO_EXTRA_BITS_CASE\	"1969-12-31 Upper bound of 32bit < 0 timestamp, no extra bits"#define LOWER_BOUND_NONNEG_NO_EXTRA_BITS_CASE\	"1970-01-01 Lower bound of 32bit >=0 timestamp, no extra bits"#define UPPER_BOUND_NONNEG_NO_EXTRA_BITS_CASE\	"2038-01-19 Upper bound of 32bit >=0 timestamp, no extra bits"#define LOWER_BOUND_NEG_LO_1_CASE\	"2038-01-19 Lower bound of 32bit <0 timestamp, lo extra sec bit on"#define UPPER_BOUND_NEG_LO_1_CASE\	"2106-02-07 Upper bound of 32bit <0 timestamp, lo extra sec bit on"#define LOWER_BOUND_NONNEG_LO_1_CASE\	"2106-02-07 Lower bound of 32bit >=0 timestamp, lo extra sec bit on"#define UPPER_BOUND_NONNEG_LO_1_CASE\	"2174-02-25 Upper bound of 32bit >=0 timestamp, lo extra sec bit on"#define LOWER_BOUND_NEG_HI_1_CASE\	"2174-02-25 Lower bound of 32bit <0 timestamp, hi extra sec bit on"#define UPPER_BOUND_NEG_HI_1_CASE\	"2242-03-16 Upper bound of 32bit <0 timestamp, hi extra sec bit on"#define LOWER_BOUND_NONNEG_HI_1_CASE\	"2242-03-16 Lower bound of 32bit >=0 timestamp, hi extra sec bit on"#define UPPER_BOUND_NONNEG_HI_1_CASE\	"2310-04-04 Upper bound of 32bit >=0 timestamp, hi extra sec bit on"#define UPPER_BOUND_NONNEG_HI_1_NS_1_CASE\	"2310-04-04 Upper bound of 32bit>=0 timestamp, hi extra sec bit 1. 1 ns"#define LOWER_BOUND_NONNEG_HI_1_NS_MAX_CASE\	"2378-04-22 Lower bound of 32bit>= timestamp. Extra sec bits 1. Max ns"#define LOWER_BOUND_NONNEG_EXTRA_BITS_1_CASE\	"2378-04-22 Lower bound of 32bit >=0 timestamp. All extra sec bits on"#define UPPER_BOUND_NONNEG_EXTRA_BITS_1_CASE\	"2446-05-10 Upper bound of 32bit >=0 timestamp. All extra sec bits on" struct timestamp_expectation {	const char *test_case_name;	struct timespec64 expected;	u32 extra_bits;	bool msb_set;	bool lower_bound;}; static const struct timestamp_expectation test_data[] = {	{		.test_case_name = LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE,		.msb_set = true,		.lower_bound = true,		.extra_bits = 0,		.expected = {.tv_sec = -0x80000000LL, .tv_nsec = 0L},	}, 	{		.test_case_name = UPPER_BOUND_NEG_NO_EXTRA_BITS_CASE,		.msb_set = true,		.lower_bound = false,		.extra_bits = 0,		.expected = {.tv_sec = -1LL, .tv_nsec = 0L},	}, 	{		.test_case_name = LOWER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,		.msb_set = false,		.lower_bound = true,		.extra_bits = 0,		.expected = {0LL, 0L},	}, 	{		.test_case_name = UPPER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,		.msb_set = false,		.lower_bound = false,		.extra_bits = 0,		.expected = {.tv_sec = 0x7fffffffLL, .tv_nsec = 0L},	}, 	{		.test_case_name = LOWER_BOUND_NEG_LO_1_CASE,		.msb_set = true,		.lower_bound = true,		.extra_bits = 1,		.expected = {.tv_sec = 0x80000000LL, .tv_nsec = 0L},	}, 	{		.test_case_name = UPPER_BOUND_NEG_LO_1_CASE,		.msb_set = true,		.lower_bound = false,		.extra_bits = 1,		.expected = {.tv_sec = 0xffffffffLL, .tv_nsec = 0L},	}, 	{		.test_case_name = LOWER_BOUND_NONNEG_LO_1_CASE,		.msb_set = false,		.lower_bound = true,		.extra_bits = 1,		.expected = {.tv_sec = 0x100000000LL, .tv_nsec = 0L},	}, 	{		.test_case_name = UPPER_BOUND_NONNEG_LO_1_CASE,		.msb_set = false,		.lower_bound = false,		.extra_bits = 1,		.expected = {.tv_sec = 0x17fffffffLL, .tv_nsec = 0L},	}, 	{		.test_case_name = LOWER_BOUND_NEG_HI_1_CASE,		.msb_set = true,		.lower_bound = true,		.extra_bits =  2,		.expected = {.tv_sec = 0x180000000LL, .tv_nsec = 0L},	}, 	{		.test_case_name = UPPER_BOUND_NEG_HI_1_CASE,		.msb_set = true,		.lower_bound = false,		.extra_bits = 2,		.expected = {.tv_sec = 0x1ffffffffLL, .tv_nsec = 0L},	}, 	{		.test_case_name = LOWER_BOUND_NONNEG_HI_1_CASE,		.msb_set = false,		.lower_bound = true,		.extra_bits = 2,		.expected = {.tv_sec = 0x200000000LL, .tv_nsec = 0L},	}, 	{		.test_case_name = UPPER_BOUND_NONNEG_HI_1_CASE,		.msb_set = false,		.lower_bound = false,		.extra_bits = 2,		.expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 0L},	}, 	{		.test_case_name = UPPER_BOUND_NONNEG_HI_1_NS_1_CASE,		.msb_set = false,		.lower_bound = false,		.extra_bits = 6,		.expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 1L},	}, 	{		.test_case_name = LOWER_BOUND_NONNEG_HI_1_NS_MAX_CASE,		.msb_set = false,		.lower_bound = true,		.extra_bits = 0xFFFFFFFF,		.expected = {.tv_sec = 0x300000000LL,			     .tv_nsec = MAX_NANOSECONDS},	}, 	{		.test_case_name = LOWER_BOUND_NONNEG_EXTRA_BITS_1_CASE,		.msb_set = false,		.lower_bound = true,		.extra_bits = 3,		.expected = {.tv_sec = 0x300000000LL, .tv_nsec = 0L},	}, 	{		.test_case_name = UPPER_BOUND_NONNEG_EXTRA_BITS_1_CASE,		.msb_set = false,		.lower_bound = false,		.extra_bits = 3,		.expected = {.tv_sec = 0x37fffffffLL, .tv_nsec = 0L},	}}; static void timestamp_expectation_to_desc(const struct timestamp_expectation *t,					  char *desc){	strscpy(desc, t->test_case_name, KUNIT_PARAM_DESC_SIZE);} KUNIT_ARRAY_PARAM(ext4_inode, test_data, timestamp_expectation_to_desc); 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;}  /* *  Test data is derived from the table in the Inode Timestamps section of *  Documentation/filesystems/ext4/inodes.rst. */static void inode_test_xtimestamp_decoding(struct kunit *test){	struct timespec64 timestamp; 	struct timestamp_expectation *test_param =			(struct timestamp_expectation *)(test->param_value); 	timestamp = ext4_decode_extra_time(				cpu_to_le32(get_32bit_time(test_param)),				cpu_to_le32(test_param->extra_bits)); 	KUNIT_EXPECT_EQ_MSG(test,			    test_param->expected.tv_sec,			    timestamp.tv_sec,			    CASE_NAME_FORMAT,			    test_param->test_case_name,			    test_param->msb_set,			    test_param->lower_bound,			    test_param->extra_bits);	KUNIT_EXPECT_EQ_MSG(test,			    test_param->expected.tv_nsec,			    timestamp.tv_nsec,			    CASE_NAME_FORMAT,			    test_param->test_case_name,			    test_param->msb_set,			    test_param->lower_bound,			    test_param->extra_bits);} static struct kunit_case ext4_inode_test_cases[] = {	KUNIT_CASE_PARAM(inode_test_xtimestamp_decoding, ext4_inode_gen_params),	{}}; static struct kunit_suite ext4_inode_test_suite = {	.name = "ext4_inode_test",	.test_cases = ext4_inode_test_cases,}; kunit_test_suites(&ext4_inode_test_suite); MODULE_DESCRIPTION("KUnit test of ext4 inode timestamp decoding");MODULE_LICENSE("GPL v2");