[LTP] [PATCH v2 09/10] Add statmount05 test

[Andrea Cervesato]

From: Andrea Cervesato <andrea.cervesato@suse.com>

This test verifies STATMOUNT_MNT_ROOT and STATMOUNT_MNT_POINT
functionalities of statmount().

Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                              |   1 +
 .../kernel/syscalls/statmount/.gitignore      |   1 +
 .../kernel/syscalls/statmount/statmount05.c   | 138 ++++++++++++++++++
 3 files changed, 140 insertions(+)
 create mode 100644 testcases/kernel/syscalls/statmount/statmount05.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 3c262ca3e..2984117e6 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1541,6 +1541,7 @@ statmount01 statmount01
 statmount02 statmount02
 statmount03 statmount03
 statmount04 statmount04
+statmount05 statmount05
 
 statfs01 statfs01
 statfs01_64 statfs01_64
diff --git a/testcases/kernel/syscalls/statmount/.gitignore b/testcases/kernel/syscalls/statmount/.gitignore
index e720050b5..f64763242 100644
--- a/testcases/kernel/syscalls/statmount/.gitignore
+++ b/testcases/kernel/syscalls/statmount/.gitignore
@@ -2,3 +2,4 @@ statmount01
 statmount02
 statmount03
 statmount04
+statmount05
diff --git a/testcases/kernel/syscalls/statmount/statmount05.c b/testcases/kernel/syscalls/statmount/statmount05.c
new file mode 100644
index 000000000..9882719f5
--- /dev/null
+++ b/testcases/kernel/syscalls/statmount/statmount05.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/**
+ * [Description]
+ *
+ * This test verifies STATMOUNT_MNT_ROOT and STATMOUNT_MNT_POINT functionalities
+ * of statmount(). In particular, STATMOUNT_MNT_ROOT will give the mount root
+ * (i.e. mount --bind /mnt /bla -> /mnt) and STATMOUNT_MNT_POINT will
+ * give the mount point (i.e. mount --bind /mnt /bla -> /bla).
+ *
+ * [Algorithm]
+ *
+ * * create a mount point
+ * * mount a folder inside the mount point
+ * * run statmount() on the mounted folder using STATMOUNT_MNT_ROOT
+ * * read results and check if contain the mount root path
+ * * run statmount() on the mounted folder using STATMOUNT_MNT_POINT
+ * * read results and check if contain the mount point path
+ */
+
+#include "statmount.h"
+#include "lapi/stat.h"
+#include "lapi/sched.h"
+
+#define MNTPOINT "mntpoint"
+#define DIRA MNTPOINT "/LTP_DIR_A"
+#define DIRB MNTPOINT "/LTP_DIR_B"
+#define SM_SIZE (1 << 10)
+
+static uint64_t root_id;
+static struct statmount *st_mount;
+static char mnt_root[PATH_MAX];
+static char mnt_point[PATH_MAX];
+
+static void test_mount_root(void)
+{
+	tst_res(TINFO, "Testing STATMOUNT_MNT_ROOT");
+
+	char *last_root;
+
+	memset(st_mount, 0, SM_SIZE);
+
+	TST_EXP_PASS(statmount(
+		root_id,
+		STATMOUNT_MNT_ROOT,
+		st_mount,
+		SM_SIZE,
+		0));
+
+	if (TST_RET == -1)
+		return;
+
+	last_root = strrchr(mnt_root, '/');
+
+	TST_EXP_EQ_LI(st_mount->mask, STATMOUNT_MNT_ROOT);
+	TST_EXP_EXPR(strcmp(st_mount->str + st_mount->mnt_root, last_root) == 0,
+		"statmount() read '%s', expected '%s'",
+		st_mount->str + st_mount->mnt_root,
+		last_root);
+}
+
+static void test_mount_point(void)
+{
+	tst_res(TINFO, "Testing STATMOUNT_MNT_POINT");
+
+	memset(st_mount, 0, SM_SIZE);
+
+	TST_EXP_POSITIVE(statmount(
+		root_id,
+		STATMOUNT_MNT_POINT,
+		st_mount,
+		SM_SIZE,
+		0));
+
+	if (TST_RET == -1)
+		return;
+
+	TST_EXP_EQ_LI(st_mount->mask, STATMOUNT_MNT_POINT);
+	TST_EXP_EXPR(strcmp(st_mount->str + st_mount->mnt_point, mnt_point) == 0,
+		"mount point is '%s'",
+		st_mount->str + st_mount->mnt_point);
+}
+
+static void run(void)
+{
+	test_mount_root();
+	test_mount_point();
+}
+
+static void setup(void)
+{
+	char *tmpdir;
+	struct statx sx;
+
+	tmpdir = tst_get_tmpdir();
+	snprintf(mnt_root, PATH_MAX, "%s/%s", tmpdir, DIRA);
+	snprintf(mnt_point, PATH_MAX, "%s/%s", tmpdir, DIRB);
+	free(tmpdir);
+
+	SAFE_MKDIR(mnt_root, 0700);
+	SAFE_MKDIR(mnt_point, 0700);
+	SAFE_MOUNT(mnt_root, mnt_point, "none", MS_BIND, NULL);
+
+	SAFE_STATX(AT_FDCWD, mnt_point, 0, STATX_MNT_ID_UNIQUE, &sx);
+	root_id = sx.stx_mnt_id;
+}
+
+static void cleanup(void)
+{
+	if (tst_is_mounted(DIRB))
+		SAFE_UMOUNT(DIRB);
+
+	if (tst_is_mounted(DIRA))
+		SAFE_UMOUNT(DIRA);
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+	.cleanup = cleanup,
+	.min_kver = "6.8",
+	.needs_tmpdir = 1,
+	.format_device = 1,
+	.mount_device = 1,
+	.mntpoint = MNTPOINT,
+	.all_filesystems = 1,
+	.skip_filesystems = (const char *const []) {
+		"fuse",
+		NULL
+	},
+	.bufs = (struct tst_buffers []) {
+		{&st_mount, .size = SM_SIZE},
+		{}
+	}
+};
-- 
2.35.3