Add kselftest support for open, linkat, unshare, mount tests
- Replace direct error handling with
`ksft_test_result_*` macros for better reporting
of test outcomes.
- Add `ksft_print_header()` and `ksft_set_plan()`
to structure test outputs more effectively.
- Introduce the helper function `is_unshare()` to
handle unshare() related checks.
- Improve the test flow by adding more detailed pass/fail
reporting for unshare, mounting, file opening, and linking
operations.
- Skip the test if it's not run as root, providing an
appropriate Warning.
Test logs:
Before change:
- Without root
error: unshare, errno 1
- With root
No, output
After change:
- Without root
TAP version 13
1..1
ok 1 # SKIP This test needs root to run
- With root
TAP version 13
1..1
ok 1 unshare(): we have a new mount namespace.
1..2
ok 2 mount(): Root filesystem private mount: Success
1..3
ok 3 mount(): Mounting tmpfs on /tmp: Success
1..4
ok 4 openat(): Open first temporary file: Success
1..5
ok 5 linkat(): Linking the temporary file: Success
1..6
ok 6 openat(): Opening the second temporary file: Success
# Totals: pass:6 fail:0 xfail:0 xpass:0 skip:0 error:0
Signed-off-by: Shivam Chaudhary <cvam0000@xxxxxxxxx>
---
Notes:
Changes in v2:
- Make the commit message more clear.
link to v1: https://lore.kernel.org/all/20241024200228.1075840-1-cvam0000@xxxxxxxxx/T/#u
.../selftests/tmpfs/bug-link-o-tmpfile.c | 72 +++++++++++++++----
1 file changed, 58 insertions(+), 14 deletions(-)
diff --git a/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c b/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c
index b5c3ddb90942..26dea19c1614 100644
--- a/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c
+++ b/tools/testing/selftests/tmpfs/bug-link-o-tmpfile.c
@@ -23,45 +23,89 @@
#include <sys/mount.h>
#include <unistd.h>
-int main(void)
-{
- int fd;
+#include "../kselftest.h"
- if (unshare(CLONE_NEWNS) == -1) {
+static int is_unshare(int flag)
+{
+ if (unshare(flag) == -1) {
if (errno == ENOSYS || errno == EPERM) {
- fprintf(stderr, "error: unshare, errno %d\n", errno);
- return 4;
+ ksft_test_result_fail("error: unshare, errno %d\n", errno);
+ return -1; // Return -1 for failure
}
fprintf(stderr, "error: unshare, errno %d\n", errno);
+ return -1;
+ }
+
+ return 0; // Return 0 for success
+}
+
+int main(void)
+{
+ int fd;
+
+ // Setting up kselftest framework
+ ksft_print_header();
+ ksft_set_plan(1);
+
+ // Check if test is run as root
+ if (geteuid()) {
+ ksft_test_result_skip("This test needs root to run!\n");
return 1;
}
- if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {
- fprintf(stderr, "error: mount '/', errno %d\n", errno);
+
+ if (is_unshare(CLONE_NEWNS) == 0) {
+ ksft_test_result_pass("unshare(): we have a new mount namespace.\n");
+ } else {
+ ksft_test_result_fail("unshare(): failed\n");
return 1;
}
+ ksft_set_plan(2);
+
+ if (mount(NULL, "/", NULL, MS_PRIVATE | MS_REC, NULL) == -1) {
+ ksft_test_result_fail("mount(): Root filesystem private mount: Fail %d\n", errno);
+ return 1;
+ } else {
+ ksft_test_result_pass("mount(): Root filesystem private mount: Success\n");
+ }
+
+ ksft_set_plan(3);
/* Our heroes: 1 root inode, 1 O_TMPFILE inode, 1 permanent inode. */
if (mount(NULL, "/tmp", "tmpfs", 0, "nr_inodes=3") == -1) {
- fprintf(stderr, "error: mount tmpfs, errno %d\n", errno);
+ ksft_test_result_fail("mount(): Mounting tmpfs on /tmp: Fail %d\n", errno);
return 1;
+ } else {
+ ksft_test_result_pass("mount(): Mounting tmpfs on /tmp: Success\n");
}
- fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_TMPFILE, 0600);
+ ksft_set_plan(4);
+ fd = openat(AT_FDCWD, "/tmp", O_WRONLY | O_TMPFILE, 0600);
if (fd == -1) {
- fprintf(stderr, "error: open 1, errno %d\n", errno);
+ ksft_test_result_fail("openat(): Open first temporary file: Fail %d\n", errno);
return 1;
+ } else {
+ ksft_test_result_pass("openat(): Open first temporary file: Success\n");
}
+
+ ksft_set_plan(5);
if (linkat(fd, "", AT_FDCWD, "/tmp/1", AT_EMPTY_PATH) == -1) {
- fprintf(stderr, "error: linkat, errno %d\n", errno);
+ ksft_test_result_fail("linkat(): Linking the temporary file: Fail %d\n", errno);
+ close(fd); // Ensure fd is closed on failure
return 1;
+ } else {
+ ksft_test_result_pass("linkat(): Linking the temporary file: Success\n");
}
close(fd);
- fd = openat(AT_FDCWD, "/tmp", O_WRONLY|O_TMPFILE, 0600);
+ ksft_set_plan(6);
+ fd = openat(AT_FDCWD, "/tmp", O_WRONLY | O_TMPFILE, 0600);
if (fd == -1) {
- fprintf(stderr, "error: open 2, errno %d\n", errno);
+ ksft_test_result_fail("openat(): Opening the second temporary file: Fail %d\n", errno);
return 1;
+ } else {
+ ksft_test_result_pass("openat(): Opening the second temporary file: Success\n");
}
+ ksft_exit_pass();
return 0;
}
--
2.34.1
