1/*
2 * Copyright (c) 2015 Fujitsu Ltd.
3 * Author: Guangwen Feng <fenggw-fnst@cn.fujitsu.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 * You should have received a copy of the GNU General Public License
14 * alone with this program.
15 */
16
17/*
18 * DESCRIPTION
19 *  Test for feature MNT_DETACH of umount2().
20 *  "Perform a lazy unmount: make the mount point unavailable for
21 *   new accesses, and actually perform the unmount when the mount
22 *   point ceases to be busy."
23 */
24
25#include <errno.h>
26
27#include "test.h"
28#include "safe_macros.h"
29#include "lapi/mount.h"
30
31static void setup(void);
32static void umount2_verify(void);
33static void cleanup(void);
34
35char *TCID = "umount2_01";
36int TST_TOTAL = 1;
37
38#define DIR_MODE	(S_IRWXU | S_IRWXG | S_IROTH | S_IXOTH)
39#define FILE_MODE	(S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID)
40#define MNTPOINT	"mntpoint"
41
42static int fd;
43static int mount_flag;
44
45static const char *device;
46static const char *fs_type;
47
48int main(int ac, char **av)
49{
50	int lc;
51
52	tst_parse_opts(ac, av, NULL, NULL);
53
54	setup();
55
56	for (lc = 0; TEST_LOOPING(lc); lc++) {
57		tst_count = 0;
58
59		umount2_verify();
60	}
61
62	cleanup();
63	tst_exit();
64}
65
66static void setup(void)
67{
68	tst_require_root();
69
70	tst_sig(NOFORK, DEF_HANDLER, NULL);
71
72	tst_tmpdir();
73
74	fs_type = tst_dev_fs_type();
75	device = tst_acquire_device(cleanup);
76
77	if (!device)
78		tst_brkm(TCONF, cleanup, "Failed to obtain block device");
79
80	tst_mkfs(cleanup, device, fs_type, NULL, NULL);
81
82	SAFE_MKDIR(cleanup, MNTPOINT, DIR_MODE);
83
84	TEST_PAUSE;
85}
86
87static void umount2_verify(void)
88{
89	int ret;
90	char buf[256];
91	const char *str = "abcdefghijklmnopqrstuvwxyz";
92
93	SAFE_MOUNT(cleanup, device, MNTPOINT, fs_type, 0, NULL);
94	mount_flag = 1;
95
96	fd = SAFE_CREAT(cleanup, MNTPOINT "/file", FILE_MODE);
97
98	TEST(umount2(MNTPOINT, MNT_DETACH));
99
100	if (TEST_RETURN != 0) {
101		tst_resm(TFAIL | TTERRNO, "umount2(2) Failed");
102		goto EXIT;
103	}
104
105	mount_flag = 0;
106
107	/* check the unavailability for new access */
108	ret = access(MNTPOINT "/file", F_OK);
109
110	if (ret != -1) {
111		tst_resm(TFAIL, "umount2(2) MNT_DETACH flag "
112			"performed abnormally");
113		goto EXIT;
114	}
115
116	/*
117	 * check the old fd still points to the file
118	 * in previous mount point and is available
119	 */
120	SAFE_WRITE(cleanup, SAFE_WRITE_ALL, fd, str, strlen(str));
121
122	SAFE_CLOSE(cleanup, fd);
123
124	SAFE_MOUNT(cleanup, device, MNTPOINT, fs_type, 0, NULL);
125	mount_flag = 1;
126
127	fd = SAFE_OPEN(cleanup, MNTPOINT "/file", O_RDONLY);
128
129	memset(buf, 0, sizeof(buf));
130
131	SAFE_READ(cleanup, 1, fd, buf, strlen(str));
132
133	if (strcmp(str, buf)) {
134		tst_resm(TFAIL, "umount2(2) MNT_DETACH flag "
135			"performed abnormally");
136		goto EXIT;
137	}
138
139	tst_resm(TPASS, "umount2(2) Passed");
140
141EXIT:
142	SAFE_CLOSE(cleanup, fd);
143	fd = 0;
144
145	if (mount_flag) {
146		if (tst_umount(MNTPOINT))
147			tst_brkm(TBROK, cleanup, "umount() failed");
148		mount_flag = 0;
149	}
150}
151
152static void cleanup(void)
153{
154	if (fd > 0 && close(fd))
155		tst_resm(TWARN | TERRNO, "Failed to close file");
156
157	if (mount_flag && tst_umount(MNTPOINT))
158		tst_resm(TWARN | TERRNO, "Failed to unmount");
159
160	if (device)
161		tst_release_device(device);
162
163	tst_rmdir();
164}
165