// 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 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) { 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}, } }; 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(×tamp, 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_suites(&ext4_inode_test_suite); MODULE_LICENSE("GPL v2");