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kselftest/openat2: test for OPENAT2_REGULAR flag

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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>
This commit is contained in:
Dorjoy Chowdhury 2026-05-16 16:43:11 +02:00 committed by Christian Brauner
parent 8b82cacad9
commit 6045a75399
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1 changed files with 49 additions and 0 deletions
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49
tools/testing/selftests/filesystems/openat2/openat2_test.c
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@ -310,4 +310,53 @@ TEST_F(openat2, flag_validation)
}
}
#ifndef OPENAT2_REGULAR
#define OPENAT2_REGULAR ((__u64)1 << 32)
#endif
#ifndef EFTYPE
#define EFTYPE 134
#endif
/* Kernel-internal carrier for OPENAT2_REGULAR (see __O_REGULAR in fcntl.h). */
#ifndef __O_REGULAR
#define __O_REGULAR (1 << 30)
#endif
/* Verify that OPENAT2_REGULAR rejects non-regular files with EFTYPE. */
TEST_F(openat2, regular_flag)
{
struct open_how how = {
.flags = OPENAT2_REGULAR | O_RDONLY,
};
int fd;
fd = sys_openat2(AT_FDCWD, "/dev/null", &how);
if (fd == -ENOENT)
SKIP(return, "/dev/null does not exist");
EXPECT_EQ(-EFTYPE, fd) {
TH_LOG("openat2 with OPENAT2_REGULAR should fail with %d (%s), got %d (%s)",
-EFTYPE, strerror(EFTYPE), fd, strerror(-fd));
}
if (fd >= 0)
close(fd);
}
/* open()/openat() must keep ignoring the internal __O_REGULAR bit. */
TEST(legacy_openat_ignores_o_regular)
{
int fd;
fd = openat(AT_FDCWD, "/dev/null", O_RDONLY | __O_REGULAR);
if (fd < 0 && errno == ENOENT)
SKIP(return, "/dev/null does not exist");
ASSERT_GE(fd, 0) {
TH_LOG("legacy openat() must ignore the __O_REGULAR carrier bit, got errno %d (%s)",
errno, strerror(errno));
}
close(fd);
}
TEST_HARNESS_MAIN