[LTP] [PATCH v5 10/16] Add statmount04 test

[Andrea Cervesato]

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

This test verifies that statmount() is correctly reading propagation
from what mount in current namespace using STATMOUNT_PROPAGATE_FROM.

Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 runtest/syscalls                                  |   1 +
 testcases/kernel/syscalls/statmount/.gitignore    |   1 +
 testcases/kernel/syscalls/statmount/statmount04.c | 105 ++++++++++++++++++++++
 3 files changed, 107 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index 47ca26213..452ac1ac9 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1577,6 +1577,7 @@ stat04_64 stat04_64
 statmount01 statmount01
 statmount02 statmount02
 statmount03 statmount03
+statmount04 statmount04
 
 statfs01 statfs01
 statfs01_64 statfs01_64
diff --git a/testcases/kernel/syscalls/statmount/.gitignore b/testcases/kernel/syscalls/statmount/.gitignore
index 2a02bf721..e720050b5 100644
--- a/testcases/kernel/syscalls/statmount/.gitignore
+++ b/testcases/kernel/syscalls/statmount/.gitignore
@@ -1,3 +1,4 @@
 statmount01
 statmount02
 statmount03
+statmount04
diff --git a/testcases/kernel/syscalls/statmount/statmount04.c b/testcases/kernel/syscalls/statmount/statmount04.c
new file mode 100644
index 000000000..509fdf6a1
--- /dev/null
+++ b/testcases/kernel/syscalls/statmount/statmount04.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * This test verifies that statmount() is correctly reading propagation from
+ * what mount in current namespace using STATMOUNT_PROPAGATE_FROM.
+ *
+ * [Algorithm]
+ *
+ * - create a mount point
+ * - propagate a mounted folder inside the mount point
+ * - run statmount() on the mount point using STATMOUNT_PROPAGATE_FROM
+ * - read results and check propagated_from parameter contains the propagated
+ *   folder ID
+ */
+
+#define _GNU_SOURCE
+
+#include "statmount.h"
+#include "lapi/stat.h"
+#include "lapi/sched.h"
+
+#define MNTPOINT "mntpoint"
+#define DIR_A MNTPOINT "/LTP_DIR_A"
+#define DIR_C_SUBFOLDER "/LTP_DIR_A/propagated"
+#define DIR_C (MNTPOINT DIR_C_SUBFOLDER)
+#define DIR_B MNTPOINT "/LTP_DIR_B"
+#define DIR_D MNTPOINT "/LTP_DIR_B/propagated"
+
+static uint64_t peer_group_id;
+static uint64_t dird_id;
+static struct statmount *st_mount;
+
+static void run(void)
+{
+	memset(st_mount, 0, sizeof(struct statmount));
+
+	TST_EXP_PASS(statmount(dird_id, STATMOUNT_PROPAGATE_FROM, st_mount,
+		sizeof(struct statmount), 0));
+
+	if (!TST_PASS)
+		return;
+
+	TST_EXP_EQ_LI(st_mount->mask, STATMOUNT_PROPAGATE_FROM);
+	TST_EXP_EQ_LI(st_mount->size, sizeof(struct statmount));
+	TST_EXP_EQ_LI(st_mount->propagate_from, peer_group_id);
+}
+
+static void setup(void)
+{
+	struct ltp_statx sx;
+
+	/* create DIR_A / DIR_C structure with DIR_C mounted */
+	SAFE_MKDIR(DIR_A, 0700);
+	SAFE_MOUNT(DIR_A, DIR_A, "none", MS_BIND, NULL);
+	SAFE_MOUNT("none", DIR_A, "none", MS_SHARED, NULL);
+
+	SAFE_MKDIR(DIR_C, 0700);
+	SAFE_MOUNT(DIR_C, DIR_C, "none", MS_BIND, NULL);
+	SAFE_MOUNT("none", DIR_C, "none", MS_SHARED, NULL);
+
+	/* DIR_A mounts into DIR_B. DIR_D is propagated */
+	SAFE_MKDIR(DIR_B, 0700);
+	SAFE_MOUNT(DIR_A, DIR_B, "none", MS_BIND, NULL);
+	SAFE_MOUNT("none", DIR_B, "none", MS_SLAVE, NULL);
+
+	SAFE_STATX(AT_FDCWD, DIR_D, 0, STATX_MNT_ID_UNIQUE, &sx);
+	dird_id = sx.data.stx_mnt_id;
+
+	peer_group_id = read_peer_group(DIR_A);
+}
+
+static void cleanup(void)
+{
+	if (tst_is_mounted(DIR_C))
+		SAFE_UMOUNT(DIR_C);
+
+	if (tst_is_mounted(DIR_B))
+		SAFE_UMOUNT(DIR_B);
+
+	if (tst_is_mounted(DIR_A))
+		SAFE_UMOUNT(DIR_A);
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+	.cleanup = cleanup,
+	.min_kver = "6.8",
+	.mount_device = 1,
+	.mntpoint = MNTPOINT,
+	.all_filesystems = 1,
+	.skip_filesystems = (const char *const []) {
+		"fuse",
+		NULL
+	},
+	.bufs = (struct tst_buffers []) {
+		{&st_mount, .size = sizeof(struct statmount)},
+		{}
+	}
+};

-- 
2.43.0