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selftests: add listmount() iteration tests

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Add a forward and backward iteration test for listmount().

Link: https://lore.kernel.org/r/20241215-vfs-6-14-mount-work-v1-3-fd55922c4af8@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-12-15 21:17:07 +01:00
parent 2ce23285d7
commit 3ab8a0b2a0
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GPG Key ID: 91C61BC06578DCA2
2 changed files with 67 additions and 1 deletions
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2
tools/testing/selftests/filesystems/statmount/Makefile
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@ -1,6 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-or-later
CFLAGS += -Wall -O2 -g $(KHDR_INCLUDES)
TEST_GEN_PROGS := statmount_test statmount_test_ns
TEST_GEN_PROGS := statmount_test statmount_test_ns listmount_test
include ../../lib.mk

66
tools/testing/selftests/filesystems/statmount/listmount_test.c Normal file
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@ -0,0 +1,66 @@
// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright (c) 2024 Christian Brauner <brauner@kernel.org>
#define _GNU_SOURCE
#include <fcntl.h>
#include <sched.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <unistd.h>
#include "statmount.h"
#include "../../kselftest_harness.h"
#ifndef LISTMOUNT_REVERSE
#define LISTMOUNT_REVERSE (1 << 0) /* List later mounts first */
#endif
#define LISTMNT_BUFFER 10
/* Check that all mount ids are in increasing order. */
TEST(listmount_forward)
{
uint64_t list[LISTMNT_BUFFER], last_mnt_id = 0;
for (;;) {
ssize_t nr_mounts;
nr_mounts = listmount(LSMT_ROOT, 0, last_mnt_id,
list, LISTMNT_BUFFER, 0);
ASSERT_GE(nr_mounts, 0);
if (nr_mounts == 0)
break;
for (size_t cur = 0; cur < nr_mounts; cur++) {
if (cur < nr_mounts - 1)
ASSERT_LT(list[cur], list[cur + 1]);
last_mnt_id = list[cur];
}
}
}
/* Check that all mount ids are in decreasing order. */
TEST(listmount_backward)
{
uint64_t list[LISTMNT_BUFFER], last_mnt_id = 0;
for (;;) {
ssize_t nr_mounts;
nr_mounts = listmount(LSMT_ROOT, 0, last_mnt_id,
list, LISTMNT_BUFFER, LISTMOUNT_REVERSE);
ASSERT_GE(nr_mounts, 0);
if (nr_mounts == 0)
break;
for (size_t cur = 0; cur < nr_mounts; cur++) {
if (cur < nr_mounts - 1)
ASSERT_GT(list[cur], list[cur + 1]);
last_mnt_id = list[cur];
}
}
}
TEST_HARNESS_MAIN