1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2017 Fujitsu Ltd.
4 * Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
5 */
6
7/*\
8 * [Description]
9 *
10 * quotactl(2) with XGETNEXTQUOTA looks for the next active quota for an user
11 * equal or higher to a given ID, in this test the ID is specified to a value
12 * close to UINT_MAX(max value of unsigned int). When reaching the upper limit
13 * and finding no active quota, it should return -1 and set errno to ENOENT.
14 * Actually, quotactl(2) overflows and and return 0 as the "next" active id.
15 *
16 * This kernel bug of xfs has been fixed in:
17 *
18 *  commit 657bdfb7f5e68ca5e2ed009ab473c429b0d6af85
19 *  Author: Eric Sandeen <sandeen@redhat.com>
20 *  Date:   Tue Jan 17 11:43:38 2017 -0800
21 *
22 *  xfs: don't wrap ID in xfs_dq_get_next_id
23 */
24
25#define _GNU_SOURCE
26#include <errno.h>
27#include <unistd.h>
28#include <stdio.h>
29#include <sys/quota.h>
30
31#include "tst_test.h"
32#include "quotactl_syscall_var.h"
33
34#ifdef HAVE_XFS_XQM_H
35# include <xfs/xqm.h>
36
37static uint32_t test_id = 0xfffffffc;
38
39static void verify_quota(void)
40{
41	struct fs_disk_quota res_dquota;
42
43	res_dquota.d_id = 1;
44
45	TEST(do_quotactl(fd, QCMD(Q_XGETNEXTQUOTA, USRQUOTA), tst_device->dev,
46		test_id, (void *)&res_dquota));
47	if (TST_RET != -1) {
48		tst_res(TFAIL, "quotactl() found the next active ID: %u unexpectedly",
49				res_dquota.d_id);
50		return;
51	}
52
53	if (TST_ERR == EINVAL)
54		tst_brk(TCONF | TTERRNO,
55			"Q_XGETNEXTQUOTA wasn't supported in quotactl()");
56
57	if (TST_ERR != ENOENT)
58		tst_res(TFAIL | TTERRNO, "quotactl() failed unexpectedly with %s expected ENOENT",
59				tst_strerrno(TST_ERR));
60	else
61		tst_res(TPASS, "quotactl() failed with ENOENT as expected");
62}
63
64static void setup(void)
65{
66	quotactl_info();
67	fd = SAFE_OPEN(MNTPOINT, O_RDONLY);
68}
69
70static void cleanup(void)
71{
72	if (fd > -1)
73		SAFE_CLOSE(fd);
74}
75
76static struct tst_test test = {
77	.setup = setup,
78	.cleanup = cleanup,
79	.needs_root = 1,
80	.needs_kconfigs = (const char *[]) {
81		"CONFIG_XFS_QUOTA",
82		NULL
83	},
84	.test_all = verify_quota,
85	.mount_device = 1,
86	.dev_fs_type = "xfs",
87	.mntpoint = MNTPOINT,
88	.mnt_data = "usrquota",
89	.test_variants = QUOTACTL_SYSCALL_VARIANTS,
90	.tags = (const struct tst_tag[]) {
91		{"linux-git", "657bdfb7f5e6"},
92		{}
93	}
94};
95
96#else
97	TST_TEST_TCONF("System doesn't have <xfs/xqm.h>");
98#endif
99