kselftest/openat2: test for OPENAT2_REGULAR flag

Just a happy path test.

Christian Brauner <brauner@kernel.org> says:

Update OPENAT2_REGULAR fallback define to match upper-32-bit UAPI value.
Port

kselftest/openat2: test for OPENAT2_REGULAR flag

Just a happy path test.

Christian Brauner <brauner@kernel.org> says:

Update OPENAT2_REGULAR fallback define to match upper-32-bit UAPI value.
Port the test to the kselftest_harness TEST*/FIXTURE framework to match
the migrated openat2_test.c, and add a regression test ensuring
open()/openat() keep ignoring the internal __O_REGULAR carrier bit.

Signed-off-by: Dorjoy Chowdhury <dorjoychy111@gmail.com>
Link: https://patch.msgid.link/20260328172314.45807-3-dorjoychy111@gmail.com
Reviewed-by: Aleksa Sarai <aleksa@amutable.com>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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selftests: openat2: migrate to kselftest harness

These tests were written in the early days of selftests' TAP support,
the more modern kselftest harness is much easier to follow and maintain.
The ac

selftests: openat2: migrate to kselftest harness

These tests were written in the early days of selftests' TAP support,
the more modern kselftest harness is much easier to follow and maintain.
The actual contents of the tests are unchanged by this change. Most of
the diff involves switching from the E_* syscall wrappers we previously
used to ASSERT_EQ(fn(...), 0) in tests and helper functions.

The first pass of the migration was done using Claude, followed by a
manual rework and review.

Assisted-by: Claude:claude-4.6-opus
Signed-off-by: Aleksa Sarai <aleksa@amutable.com>
Link: https://patch.msgid.link/20260401-openat2-selftests-kunit-v2-4-ad153a07da0c@amutable.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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selftests: openat2: switch from custom ARRAY_LEN to ARRAY_SIZE

For whatever reason, the original version of the tests used a custom
version of ARRAY_SIZE, but ARRAY_SIZE works just as well.

Signed-

selftests: openat2: switch from custom ARRAY_LEN to ARRAY_SIZE

For whatever reason, the original version of the tests used a custom
version of ARRAY_SIZE, but ARRAY_SIZE works just as well.

Signed-off-by: Aleksa Sarai <aleksa@amutable.com>
Link: https://patch.msgid.link/20260401-openat2-selftests-kunit-v2-3-ad153a07da0c@amutable.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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selftests: move openat2 tests to selftests/filesystems/

These tests really should've always belonged there, doubly so now that
they include a lot of other generic filesystem-related tests.

Suggeste

selftests: move openat2 tests to selftests/filesystems/

These tests really should've always belonged there, doubly so now that
they include a lot of other generic filesystem-related tests.

Suggested-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Aleksa Sarai <aleksa@amutable.com>
Link: https://patch.msgid.link/20260401-openat2-selftests-kunit-v2-1-ad153a07da0c@amutable.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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