1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2020 CTERA Networks. All Rights Reserved.
4 *
5 * Started by Amir Goldstein <amir73il@gmail.com>
6 *
7 * DESCRIPTION
8 *     Check that dnotify event is reported to both parent and subdir
9 */
10
11#include <signal.h>
12#include <stdio.h>
13#include <unistd.h>
14#include "tst_test.h"
15#include "lapi/fcntl.h"
16
17#define	TEST_DIR	"test_dir"
18
19#define TEST_SIG SIGRTMIN+1
20
21static int parent_fd, subdir_fd;
22static int got_parent_event, got_subdir_event;
23
24static void dnotify_handler(int sig, siginfo_t *si, void *data __attribute__((unused)))
25{
26	if (si->si_fd == parent_fd)
27		got_parent_event = 1;
28	else if (si->si_fd == subdir_fd)
29		got_subdir_event = 1;
30	else
31		tst_brk(TBROK, "Got unexpected signal %d with si_fd %d", sig, si->si_fd);
32}
33
34static void setup_dnotify(int fd)
35{
36	struct sigaction act;
37
38	act.sa_sigaction = dnotify_handler;
39	sigemptyset(&act.sa_mask);
40	act.sa_flags = SA_SIGINFO;
41	sigaction(TEST_SIG, &act, NULL);
42
43	TEST(fcntl(fd, F_SETSIG, TEST_SIG));
44	if (TST_RET != 0) {
45		tst_brk(TBROK, "F_SETSIG failed errno = %d : %s",
46			TST_ERR, strerror(TST_ERR));
47	}
48	TEST(fcntl(fd, F_NOTIFY, DN_ATTRIB|DN_MULTISHOT));
49	if (TST_RET != 0) {
50		tst_brk(TBROK, "F_NOTIFY failed errno = %d : %s",
51			TST_ERR, strerror(TST_ERR));
52	}
53}
54
55static void verify_dnotify(void)
56{
57	parent_fd = SAFE_OPEN(".", O_RDONLY);
58	subdir_fd = SAFE_OPEN(TEST_DIR, O_RDONLY);
59	/* Watch "." and its children for changes */
60	setup_dnotify(parent_fd);
61	/* Also watch subdir itself for changes */
62	setup_dnotify(subdir_fd);
63	/* Generate DN_ATTRIB event on subdir that should send a signal on both fds */
64	SAFE_CHMOD(TEST_DIR, 0755);
65	if (got_parent_event)
66		tst_res(TPASS, "Got event on parent as expected");
67	else
68		tst_res(TFAIL, "Missing event on parent");
69	if (got_subdir_event)
70		tst_res(TPASS, "Got event on subdir as expected");
71	else
72		tst_res(TFAIL, "Missing event on subdir");
73	SAFE_CLOSE(parent_fd);
74	SAFE_CLOSE(subdir_fd);
75}
76
77static void setup(void)
78{
79	SAFE_MKDIR(TEST_DIR, 00700);
80}
81
82static void cleanup(void)
83{
84	if (parent_fd > 0)
85		SAFE_CLOSE(parent_fd);
86	if (subdir_fd > 0)
87		SAFE_CLOSE(subdir_fd);
88}
89
90static struct tst_test test = {
91	.needs_tmpdir = 1,
92	.setup = setup,
93	.cleanup = cleanup,
94	.test_all = verify_dnotify,
95	.needs_kconfigs = (const char *[]) { "CONFIG_DNOTIFY=y", NULL },
96};
97