283 lines
7.5 KiB
C
283 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* KUnit test of ext4 inode that verify the seconds part of [a/c/m]
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* timestamps in ext4 inode structs are decoded correctly.
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*/
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#include <kunit/test.h>
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#include <linux/kernel.h>
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#include <linux/time64.h>
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#include "ext4.h"
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/*
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* For constructing the nonnegative timestamp lower bound value.
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* binary: 00000000 00000000 00000000 00000000
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*/
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#define LOWER_MSB_0 0L
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/*
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* For constructing the nonnegative timestamp upper bound value.
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* binary: 01111111 11111111 11111111 11111111
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*
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*/
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#define UPPER_MSB_0 0x7fffffffL
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/*
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* For constructing the negative timestamp lower bound value.
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* binary: 10000000 00000000 00000000 00000000
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*/
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#define LOWER_MSB_1 (-(UPPER_MSB_0) - 1L) /* avoid overflow */
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/*
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* For constructing the negative timestamp upper bound value.
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* binary: 11111111 11111111 11111111 11111111
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*/
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#define UPPER_MSB_1 (-1L)
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/*
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* Upper bound for nanoseconds value supported by the encoding.
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* binary: 00111111 11111111 11111111 11111111
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*/
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#define MAX_NANOSECONDS ((1L << 30) - 1)
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#define CASE_NAME_FORMAT "%s: msb:%x lower_bound:%x extra_bits: %x"
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#define LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE\
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"1901-12-13 Lower bound of 32bit < 0 timestamp, no extra bits"
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#define UPPER_BOUND_NEG_NO_EXTRA_BITS_CASE\
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"1969-12-31 Upper bound of 32bit < 0 timestamp, no extra bits"
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#define LOWER_BOUND_NONNEG_NO_EXTRA_BITS_CASE\
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"1970-01-01 Lower bound of 32bit >=0 timestamp, no extra bits"
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#define UPPER_BOUND_NONNEG_NO_EXTRA_BITS_CASE\
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"2038-01-19 Upper bound of 32bit >=0 timestamp, no extra bits"
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#define LOWER_BOUND_NEG_LO_1_CASE\
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"2038-01-19 Lower bound of 32bit <0 timestamp, lo extra sec bit on"
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#define UPPER_BOUND_NEG_LO_1_CASE\
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"2106-02-07 Upper bound of 32bit <0 timestamp, lo extra sec bit on"
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#define LOWER_BOUND_NONNEG_LO_1_CASE\
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"2106-02-07 Lower bound of 32bit >=0 timestamp, lo extra sec bit on"
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#define UPPER_BOUND_NONNEG_LO_1_CASE\
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"2174-02-25 Upper bound of 32bit >=0 timestamp, lo extra sec bit on"
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#define LOWER_BOUND_NEG_HI_1_CASE\
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"2174-02-25 Lower bound of 32bit <0 timestamp, hi extra sec bit on"
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#define UPPER_BOUND_NEG_HI_1_CASE\
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"2242-03-16 Upper bound of 32bit <0 timestamp, hi extra sec bit on"
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#define LOWER_BOUND_NONNEG_HI_1_CASE\
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"2242-03-16 Lower bound of 32bit >=0 timestamp, hi extra sec bit on"
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#define UPPER_BOUND_NONNEG_HI_1_CASE\
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"2310-04-04 Upper bound of 32bit >=0 timestamp, hi extra sec bit on"
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#define UPPER_BOUND_NONNEG_HI_1_NS_1_CASE\
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"2310-04-04 Upper bound of 32bit>=0 timestamp, hi extra sec bit 1. 1 ns"
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#define LOWER_BOUND_NONNEG_HI_1_NS_MAX_CASE\
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"2378-04-22 Lower bound of 32bit>= timestamp. Extra sec bits 1. Max ns"
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#define LOWER_BOUND_NONNEG_EXTRA_BITS_1_CASE\
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"2378-04-22 Lower bound of 32bit >=0 timestamp. All extra sec bits on"
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#define UPPER_BOUND_NONNEG_EXTRA_BITS_1_CASE\
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"2446-05-10 Upper bound of 32bit >=0 timestamp. All extra sec bits on"
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struct timestamp_expectation {
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const char *test_case_name;
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struct timespec64 expected;
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u32 extra_bits;
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bool msb_set;
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bool lower_bound;
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};
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static const struct timestamp_expectation test_data[] = {
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{
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.test_case_name = LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE,
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.msb_set = true,
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.lower_bound = true,
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.extra_bits = 0,
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.expected = {.tv_sec = -0x80000000LL, .tv_nsec = 0L},
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},
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{
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.test_case_name = UPPER_BOUND_NEG_NO_EXTRA_BITS_CASE,
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.msb_set = true,
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.lower_bound = false,
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.extra_bits = 0,
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.expected = {.tv_sec = -1LL, .tv_nsec = 0L},
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},
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{
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.test_case_name = LOWER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,
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.msb_set = false,
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.lower_bound = true,
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.extra_bits = 0,
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.expected = {0LL, 0L},
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},
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{
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.test_case_name = UPPER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,
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.msb_set = false,
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.lower_bound = false,
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.extra_bits = 0,
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.expected = {.tv_sec = 0x7fffffffLL, .tv_nsec = 0L},
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},
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{
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.test_case_name = LOWER_BOUND_NEG_LO_1_CASE,
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.msb_set = true,
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.lower_bound = true,
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.extra_bits = 1,
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.expected = {.tv_sec = 0x80000000LL, .tv_nsec = 0L},
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},
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{
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.test_case_name = UPPER_BOUND_NEG_LO_1_CASE,
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.msb_set = true,
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.lower_bound = false,
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.extra_bits = 1,
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.expected = {.tv_sec = 0xffffffffLL, .tv_nsec = 0L},
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},
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{
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.test_case_name = LOWER_BOUND_NONNEG_LO_1_CASE,
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.msb_set = false,
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.lower_bound = true,
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.extra_bits = 1,
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.expected = {.tv_sec = 0x100000000LL, .tv_nsec = 0L},
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},
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{
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.test_case_name = UPPER_BOUND_NONNEG_LO_1_CASE,
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.msb_set = false,
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.lower_bound = false,
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.extra_bits = 1,
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.expected = {.tv_sec = 0x17fffffffLL, .tv_nsec = 0L},
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},
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{
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.test_case_name = LOWER_BOUND_NEG_HI_1_CASE,
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.msb_set = true,
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.lower_bound = true,
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.extra_bits = 2,
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.expected = {.tv_sec = 0x180000000LL, .tv_nsec = 0L},
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},
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{
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.test_case_name = UPPER_BOUND_NEG_HI_1_CASE,
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.msb_set = true,
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.lower_bound = false,
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.extra_bits = 2,
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.expected = {.tv_sec = 0x1ffffffffLL, .tv_nsec = 0L},
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},
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{
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.test_case_name = LOWER_BOUND_NONNEG_HI_1_CASE,
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.msb_set = false,
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.lower_bound = true,
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.extra_bits = 2,
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.expected = {.tv_sec = 0x200000000LL, .tv_nsec = 0L},
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},
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{
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.test_case_name = UPPER_BOUND_NONNEG_HI_1_CASE,
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.msb_set = false,
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.lower_bound = false,
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.extra_bits = 2,
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.expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 0L},
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},
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{
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.test_case_name = UPPER_BOUND_NONNEG_HI_1_NS_1_CASE,
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.msb_set = false,
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.lower_bound = false,
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.extra_bits = 6,
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.expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 1L},
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},
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{
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.test_case_name = LOWER_BOUND_NONNEG_HI_1_NS_MAX_CASE,
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.msb_set = false,
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.lower_bound = true,
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.extra_bits = 0xFFFFFFFF,
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.expected = {.tv_sec = 0x300000000LL,
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.tv_nsec = MAX_NANOSECONDS},
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},
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{
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.test_case_name = LOWER_BOUND_NONNEG_EXTRA_BITS_1_CASE,
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.msb_set = false,
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.lower_bound = true,
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.extra_bits = 3,
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.expected = {.tv_sec = 0x300000000LL, .tv_nsec = 0L},
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},
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{
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.test_case_name = UPPER_BOUND_NONNEG_EXTRA_BITS_1_CASE,
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.msb_set = false,
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.lower_bound = false,
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.extra_bits = 3,
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.expected = {.tv_sec = 0x37fffffffLL, .tv_nsec = 0L},
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}
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};
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static void timestamp_expectation_to_desc(const struct timestamp_expectation *t,
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char *desc)
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{
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strscpy(desc, t->test_case_name, KUNIT_PARAM_DESC_SIZE);
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}
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KUNIT_ARRAY_PARAM(ext4_inode, test_data, timestamp_expectation_to_desc);
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static time64_t get_32bit_time(const struct timestamp_expectation * const test)
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{
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if (test->msb_set) {
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if (test->lower_bound)
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return LOWER_MSB_1;
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return UPPER_MSB_1;
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}
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if (test->lower_bound)
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return LOWER_MSB_0;
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return UPPER_MSB_0;
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}
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/*
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* Test data is derived from the table in the Inode Timestamps section of
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* Documentation/filesystems/ext4/inodes.rst.
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*/
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static void inode_test_xtimestamp_decoding(struct kunit *test)
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{
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struct timespec64 timestamp;
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struct timestamp_expectation *test_param =
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(struct timestamp_expectation *)(test->param_value);
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timestamp.tv_sec = get_32bit_time(test_param);
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ext4_decode_extra_time(×tamp,
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cpu_to_le32(test_param->extra_bits));
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KUNIT_EXPECT_EQ_MSG(test,
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test_param->expected.tv_sec,
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timestamp.tv_sec,
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CASE_NAME_FORMAT,
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test_param->test_case_name,
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test_param->msb_set,
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test_param->lower_bound,
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test_param->extra_bits);
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KUNIT_EXPECT_EQ_MSG(test,
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test_param->expected.tv_nsec,
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timestamp.tv_nsec,
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CASE_NAME_FORMAT,
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test_param->test_case_name,
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test_param->msb_set,
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test_param->lower_bound,
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test_param->extra_bits);
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}
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static struct kunit_case ext4_inode_test_cases[] = {
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KUNIT_CASE_PARAM(inode_test_xtimestamp_decoding, ext4_inode_gen_params),
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{}
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};
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static struct kunit_suite ext4_inode_test_suite = {
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.name = "ext4_inode_test",
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.test_cases = ext4_inode_test_cases,
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};
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kunit_test_suites(&ext4_inode_test_suite);
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MODULE_LICENSE("GPL v2");
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