@@ -1540,6 +1540,7 @@ stat04_64 symlink01 -T stat04_64
statmount01 statmount01
statmount02 statmount02
statmount03 statmount03
+statmount04 statmount04
statfs01 statfs01
statfs01_64 statfs01_64
@@ -1,3 +1,4 @@
statmount01
statmount02
statmount03
+statmount04
new file mode 100644
@@ -0,0 +1,133 @@
+// 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
+ */
+
+#include "statmount.h"
+#include "lapi/stat.h"
+#include "lapi/sched.h"
+#include "tst_safe_stdio.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 int read_peer_group(void)
+{
+ 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, DIR_C_SUBFOLDER) == 0)
+ break;
+ }
+
+ if (group == -1)
+ tst_brk(TBROK, "Can't reed peer group ID for %s", DIR_C_SUBFOLDER);
+
+ return group;
+}
+
+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_RET == -1)
+ 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 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.stx_mnt_id;
+
+ peer_group_id = read_peer_group();
+}
+
+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",
+ .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 = sizeof(struct statmount)},
+ {}
+ }
+};