Unverified Commit 3ac7ea91 authored by Christian Brauner's avatar Christian Brauner
Browse files

selftests: add FSMOUNT_NAMESPACE tests 

Add selftests for FSMOUNT_NAMESPACE which creates a new mount namespace
with the newly created filesystem mounted onto a copy of the real
rootfs.

Link: https://patch.msgid.link/20260122-work-fsmount-namespace-v1-6-5ef0a886e646@kernel.org


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent be1ca3ee

tools/testing/selftests/filesystems/fsmount_ns/.gitignore

0 → 100644
+1 −0
Original line number Diff line number Diff line 
fsmount_ns_test

tools/testing/selftests/filesystems/fsmount_ns/Makefile

0 → 100644
+10 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

TEST_GEN_PROGS := fsmount_ns_test



CFLAGS += -Wall -O0 -g $(KHDR_INCLUDES) $(TOOLS_INCLUDES)

LDLIBS := -lcap



include ../../lib.mk



$(OUTPUT)/fsmount_ns_test: fsmount_ns_test.c ../utils.c

	$(CC) $(CFLAGS) -o $@ $^ $(LDLIBS)

tools/testing/selftests/filesystems/fsmount_ns/fsmount_ns_test.c

0 → 100644
+1138 −0

File added.

Preview size limit exceeded, changes collapsed.

tools/testing/selftests/filesystems/open_tree_ns/Makefile

+1 −1
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

TEST_GEN_PROGS := open_tree_ns_test



CFLAGS := -Wall -Werror -g $(KHDR_INCLUDES)

CFLAGS += -Wall -O0 -g $(KHDR_INCLUDES) $(TOOLS_INCLUDES)

LDLIBS := -lcap



include ../../lib.mk

tools/testing/selftests/filesystems/open_tree_ns/open_tree_ns_test.c

+6 −29
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2026 Christian Brauner <brauner@kernel.org>

 *

 * Test for OPEN_TREE_NAMESPACE flag.

 *

 * Test that open_tree() with OPEN_TREE_NAMESPACE creates a new mount
@@ -50,31 +52,6 @@ static int get_mnt_ns_id_from_path(const char *path, uint64_t *mnt_ns_id) 
	return ret;

}



#define STATMOUNT_BUFSIZE (1 << 15)



static struct statmount *statmount_alloc(uint64_t mnt_id, uint64_t mnt_ns_id, uint64_t mask)

{

	struct statmount *buf;

	size_t bufsize = STATMOUNT_BUFSIZE;

	int ret;



	for (;;) {

		buf = malloc(bufsize);

		if (!buf)

			return NULL;



		ret = statmount(mnt_id, mnt_ns_id, mask, buf, bufsize, 0);

		if (ret == 0)

			return buf;



		free(buf);

		if (errno != EOVERFLOW)

			return NULL;



		bufsize <<= 1;

	}

}



static void log_mount(struct __test_metadata *_metadata, struct statmount *sm)

{

	const char *fs_type = "";
@@ -221,7 +198,7 @@ FIXTURE_SETUP(open_tree_ns) 
		SKIP(return, "open_tree() syscall not supported");



	/* Check if statmount/listmount are supported */

	ret = statmount(0, 0, 0, NULL, 0, 0);

	ret = statmount(0, 0, 0, 0, NULL, 0, 0);

	if (ret == -1 && errno == ENOSYS)

		SKIP(return, "statmount() syscall not supported");
@@ -340,7 +317,7 @@ TEST_F(open_tree_ns, verify_mount_properties) 
	ASSERT_GE(nr_mounts, 1);



	/* Get info about the root mount (the bind mount, rootfs is hidden) */

	ret = statmount(list[0], new_ns_id, STATMOUNT_MNT_BASIC, &sm, sizeof(sm), 0);

	ret = statmount(list[0], new_ns_id, 0, STATMOUNT_MNT_BASIC, &sm, sizeof(sm), 0);

	ASSERT_EQ(ret, 0);



	ASSERT_NE(sm.mnt_id, sm.mnt_parent_id);
@@ -452,7 +429,7 @@ FIXTURE_SETUP(open_tree_ns_userns) 
		SKIP(return, "open_tree() syscall not supported");



	/* Check if statmount/listmount are supported */

	ret = statmount(0, 0, 0, NULL, 0, 0);

	ret = statmount(0, 0, 0, 0, NULL, 0, 0);

	if (ret == -1 && errno == ENOSYS)

		SKIP(return, "statmount() syscall not supported");

}
@@ -904,7 +881,7 @@ TEST_F(open_tree_ns_userns, umount_succeeds) 
		ASSERT_FALSE(true) TH_LOG("setns into new namespace failed");

		break;

	case 7:

		ASSERT_FALSE(true) TH_LOG("umount succeeded but should have failed with EINVAL");

		ASSERT_FALSE(true) TH_LOG("umount failed but should have succeeded");

		break;

	case 9:

		ASSERT_FALSE(true) TH_LOG("listmount failed");