[LTP] [PATCH v5 09/16] Add statmount03 test

[Andrea Cervesato <andrea.cervesato@suse.de>]

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

This test verifies that statmount() is correctly reading mount
information (mount id, parent mount id, mount attributes etc.)
using STATMOUNT_MNT_BASIC.

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/statmount.h   |  24 ++++
 testcases/kernel/syscalls/statmount/statmount03.c | 138 ++++++++++++++++++++++
 4 files changed, 164 insertions(+)

diff --git a/runtest/syscalls b/runtest/syscalls
index c6c31c546..47ca26213 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1576,6 +1576,7 @@ stat04_64 stat04_64
 
 statmount01 statmount01
 statmount02 statmount02
+statmount03 statmount03
 
 statfs01 statfs01
 statfs01_64 statfs01_64
diff --git a/testcases/kernel/syscalls/statmount/.gitignore b/testcases/kernel/syscalls/statmount/.gitignore
index a30b9565f..2a02bf721 100644
--- a/testcases/kernel/syscalls/statmount/.gitignore
+++ b/testcases/kernel/syscalls/statmount/.gitignore
@@ -1,2 +1,3 @@
 statmount01
 statmount02
+statmount03
diff --git a/testcases/kernel/syscalls/statmount/statmount.h b/testcases/kernel/syscalls/statmount/statmount.h
index cb0fd1cca..d21d7f8da 100644
--- a/testcases/kernel/syscalls/statmount/statmount.h
+++ b/testcases/kernel/syscalls/statmount/statmount.h
@@ -11,6 +11,7 @@
 #include "tst_test.h"
 #include "lapi/mount.h"
 #include "lapi/syscalls.h"
+#include "tst_safe_stdio.h"
 
 static inline int statmount(uint64_t mnt_id, uint64_t mask, struct statmount *buf,
 		     size_t bufsize, unsigned int flags)
@@ -24,4 +25,27 @@ static inline int statmount(uint64_t mnt_id, uint64_t mask, struct statmount *bu
 	return tst_syscall(__NR_statmount, &req, buf, bufsize, flags);
 }
 
+static inline int read_peer_group(const char *path)
+{
+	FILE *file;
+	char line[PATH_MAX];
+	char mroot[PATH_MAX];
+	int group = -1;
+
+	file = SAFE_FOPEN("/proc/self/mountinfo", "r");
+
+	while (fgets(line, sizeof(line), file)) {
+		if (sscanf(line, "%*d %*d %*d:%*d %s %*s %*s shared:%d", mroot, &group) != 2)
+			continue;
+
+		if (strcmp(mroot, path) == 0)
+			break;
+	}
+
+	if (group == -1)
+		tst_brk(TBROK, "Can't reed peer group ID for %s", path);
+
+	return group;
+}
+
 #endif
diff --git a/testcases/kernel/syscalls/statmount/statmount03.c b/testcases/kernel/syscalls/statmount/statmount03.c
new file mode 100644
index 000000000..dface528f
--- /dev/null
+++ b/testcases/kernel/syscalls/statmount/statmount03.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 that statmount() is correctly reading mount information
+ * (mount id, parent mount id, mount attributes etc.) using STATMOUNT_MNT_BASIC.
+ *
+ * [Algorithm]
+ *
+ * - create a mount point
+ * - create a new parent folder inside the mount point and obtain its mount info
+ * - create the new "/" mount folder and obtain its mount info
+ * - run statmount() on the mount point using STATMOUNT_MNT_BASIC
+ * - read results and check if mount info are correct
+ */
+
+#define _GNU_SOURCE
+
+#include "statmount.h"
+#include "lapi/stat.h"
+#include "lapi/sched.h"
+
+#define DIR_A "LTP_DIR_A"
+#define DIR_B "LTP_DIR_B"
+
+static uint64_t mnt_id;
+static uint64_t mnt_id_old;
+static uint64_t parent_id;
+static uint64_t parent_id_old;
+static uint64_t mnt_peer_group;
+static uint64_t mnt_master;
+static struct statmount *st_mount;
+
+static void read_mnt_id(
+	const char *path,
+	uint64_t *mnt_id,
+	uint64_t *mnt_id_unique)
+{
+	struct ltp_statx sx;
+
+	if (mnt_id) {
+		sx.data.stx_mask = STATX_MNT_ID;
+
+		SAFE_STATX(AT_FDCWD, path, 0, STATX_MNT_ID, &sx);
+		*mnt_id = sx.data.stx_mnt_id;
+	}
+
+	if (mnt_id_unique) {
+		sx.data.stx_mask = STATX_MNT_ID_UNIQUE;
+
+		SAFE_STATX(AT_FDCWD, path, 0, STATX_MNT_ID_UNIQUE, &sx);
+		*mnt_id_unique = sx.data.stx_mnt_id;
+	}
+}
+
+static struct tcase {
+	uint64_t prop_type;
+	char *msg;
+} tcases[] = {
+	{ MS_PRIVATE, TST_TO_STR_(MS_PRIVATE) },
+	{ MS_SHARED, TST_TO_STR_(MS_SHARED) },
+	{ MS_SLAVE, TST_TO_STR_(MS_SLAVE) },
+	{ MS_UNBINDABLE, TST_TO_STR_(MS_UNBINDABLE) },
+};
+
+static void run(unsigned int i)
+{
+	struct tcase *tc = &tcases[i];
+
+	tst_res(TINFO,  "Testing statmount() on %s", tc->msg);
+
+	SAFE_MOUNT(DIR_B, DIR_A, "none", MS_BIND, NULL);
+	SAFE_MOUNT("none", DIR_A, "none", tc->prop_type, NULL);
+	read_mnt_id(DIR_A, &mnt_id_old, &mnt_id);
+
+	memset(st_mount, 0, sizeof(struct statmount));
+
+	TST_EXP_PASS(statmount(mnt_id, STATMOUNT_MNT_BASIC, st_mount,
+		sizeof(struct statmount), 0));
+
+	SAFE_UMOUNT(DIR_A);
+
+	if (!TST_PASS)
+		return;
+
+	mnt_peer_group = tc->prop_type == MS_SHARED ? read_peer_group(DIR_A) : 0;
+	mnt_master = tc->prop_type == MS_SLAVE ? read_peer_group(DIR_A) : 0;
+
+	TST_EXP_EQ_LI(st_mount->mask, STATMOUNT_MNT_BASIC);
+	TST_EXP_EQ_LI(st_mount->size, sizeof(struct statmount));
+	TST_EXP_EQ_LI(st_mount->mnt_id, mnt_id);
+	TST_EXP_EQ_LI(st_mount->mnt_id_old, mnt_id_old);
+	TST_EXP_EQ_LI(st_mount->mnt_parent_id, parent_id);
+	TST_EXP_EQ_LI(st_mount->mnt_parent_id_old, parent_id_old);
+	TST_EXP_EQ_LU(st_mount->mnt_propagation & tc->prop_type, tc->prop_type);
+	TST_EXP_EQ_LI(st_mount->mnt_master, mnt_master);
+	TST_EXP_EQ_LI(st_mount->mnt_peer_group, mnt_peer_group);
+}
+
+static void setup(void)
+{
+	SAFE_MKDIR(DIR_A, 0700);
+	SAFE_MKDIR(DIR_B, 0700);
+
+	SAFE_UNSHARE(CLONE_NEWNS);
+	SAFE_MOUNT("none", "/", "none", MS_REC | MS_PRIVATE, NULL);
+
+	SAFE_MOUNT(DIR_B, DIR_B, "none", MS_BIND, NULL);
+	SAFE_MOUNT("none", DIR_B, "none", MS_SHARED, NULL);
+
+	read_mnt_id(DIR_A, &parent_id_old, &parent_id);
+}
+
+static void cleanup(void)
+{
+	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 = run,
+	.tcnt = ARRAY_SIZE(tcases),
+	.setup = setup,
+	.cleanup = cleanup,
+	.min_kver = "6.8",
+	.needs_tmpdir = 1,
+	.bufs = (struct tst_buffers []) {
+		{&st_mount, .size = sizeof(struct statmount)},
+		{}
+	}
+};

-- 
2.43.0


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