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linux_kernel/fs/ext4/inode-test.c
Alan Maguire c475c77d5b kunit: allow kunit tests to be loaded as a module 
As tests are added to kunit, it will become less feasible to execute
all built tests together.  By supporting modular tests we provide
a simple way to do selective execution on a running system; specifying

CONFIG_KUNIT=y
CONFIG_KUNIT_EXAMPLE_TEST=m

...means we can simply "insmod example-test.ko" to run the tests.

To achieve this we need to do the following:

o export the required symbols in kunit
o string-stream tests utilize non-exported symbols so for now we skip
  building them when CONFIG_KUNIT_TEST=m.
o drivers/base/power/qos-test.c contains a few unexported interface
  references, namely freq_qos_read_value() and freq_constraints_init().
  Both of these could be potentially defined as static inline functions
  in include/linux/pm_qos.h, but for now we simply avoid supporting
  module build for that test suite.
o support a new way of declaring test suites.  Because a module cannot
  do multiple late_initcall()s, we provide a kunit_test_suites() macro
  to declare multiple suites within the same module at once.
o some test module names would have been too general ("test-test"
  and "example-test" for kunit tests, "inode-test" for ext4 tests);
  rename these as appropriate ("kunit-test", "kunit-example-test"
  and "ext4-inode-test" respectively).

Also define kunit_test_suite() via kunit_test_suites()
as callers in other trees may need the old definition.

Co-developed-by: Knut Omang <knut.omang@oracle.com>
Signed-off-by: Knut Omang <knut.omang@oracle.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Theodore Ts'o <tytso@mit.edu> # for ext4 bits
Acked-by: David Gow <davidgow@google.com> # For list-test
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
2020-01-09 16:42:29 -07:00

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// 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(&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_suites(&ext4_inode_test_suite);
MODULE_LICENSE("GPL v2");
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