t_rwtoro.c revision 314817 
1/*	$NetBSD: t_rwtoro.c,v 1.1 2017/01/27 10:45:11 hannken Exp $	*/
2
3/*-
4 * Copyright (c) 2017 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/types.h>
30#include <sys/mount.h>
31#include <sys/stat.h>
32#include <sys/statvfs.h>
33
34#include <atf-c.h>
35#include <fcntl.h>
36#include <libgen.h>
37#include <stdlib.h>
38#include <unistd.h>
39
40#include <rump/rump_syscalls.h>
41#include <rump/rump.h>
42
43#include <miscfs/nullfs/null.h>
44#include <fs/tmpfs/tmpfs_args.h>
45
46#include "../common/h_fsmacros.h"
47#include "../../h_macros.h"
48
49static const char *unsupported = "fs does not support r/o remount";
50static char file_path[MAXPATHLEN];
51static int file_fd;
52
53/*
54 * Remount the filesystem read-only and test errno.
55 * Skip filesystems that don't implement read-write -> read-only.
56 */
57static void
58remount_ro(const atf_tc_t *tc, const char *mp, int expected_errno)
59{
60	int error;
61	union {
62		struct tmpfs_args tmpfs;
63		char data[4095];
64	} mount_args;
65	int mount_args_length;
66	struct statvfs sbuf;
67
68	if (FSTYPE_ZFS(tc))
69		atf_tc_skip("%s", unsupported);
70
71	/* Prepare mount arguments. */
72	RL(rump_sys_statvfs1(mp, &sbuf, ST_WAIT));
73	mount_args_length = sizeof(mount_args);
74	memset(&mount_args, 0, mount_args_length);
75	if (FSTYPE_TMPFS(tc))
76		mount_args.tmpfs.ta_version = TMPFS_ARGS_VERSION;
77	mount_args_length = rump_sys_mount(sbuf.f_fstypename, mp, MNT_GETARGS,
78	    &mount_args, mount_args_length);
79	ATF_CHECK(mount_args_length >= 0);
80
81	/* Remount and test result. */
82	error = rump_sys_mount(sbuf.f_fstypename, mp, MNT_UPDATE | MNT_RDONLY,
83	    &mount_args, mount_args_length);
84	if (errno == EOPNOTSUPP)
85		atf_tc_skip("%s", unsupported);
86	if (expected_errno == 0)
87		ATF_CHECK(error == 0);
88	else
89		ATF_CHECK_ERRNO(expected_errno, error == -1);
90}
91
92static void
93open_file_ro(const char *prefix)
94{
95
96	snprintf(file_path, sizeof(file_path), "%s/file", prefix);
97	RL(file_fd = rump_sys_open(file_path, O_CREAT | O_RDWR, 0777));
98	RL(rump_sys_close(file_fd));
99	RL(file_fd = rump_sys_open(file_path, O_RDONLY));
100}
101
102static void
103open_file_ro_unlink(const char *prefix)
104{
105
106	snprintf(file_path, sizeof(file_path), "%s/file", prefix);
107	RL(file_fd = rump_sys_open(file_path, O_CREAT | O_RDWR, 0777));
108	RL(rump_sys_close(file_fd));
109	RL(file_fd = rump_sys_open(file_path, O_RDONLY));
110	RL(rump_sys_unlink(file_path));
111}
112
113static void
114open_file_rw(const char *prefix)
115{
116
117	snprintf(file_path, sizeof(file_path), "%s/file", prefix);
118	RL(file_fd = rump_sys_open(file_path, O_CREAT | O_RDWR, 0777));
119}
120
121static void
122close_file(const char *unused)
123{
124
125	RL(rump_sys_close(file_fd));
126}
127
128static void
129basic_test(const atf_tc_t *tc, const char *mp, int expected_errno,
130    bool use_layer, void (*pre)(const char *), void (*post)(const char *))
131{
132	const char *null_mount = "/nullm";
133	struct null_args nargs;
134
135	if (use_layer) {
136		RL(rump_sys_mkdir(null_mount, 0777));
137		memset(&nargs, 0, sizeof(nargs));
138		nargs.nulla_target = __UNCONST(mp);;
139		RL(rump_sys_mount(MOUNT_NULL, null_mount, 0,
140		    &nargs, sizeof(nargs)));
141	}
142	if (pre)
143		(*pre)(use_layer ? null_mount : mp);
144	remount_ro(tc, mp, expected_errno);
145	if (post)
146		(*post)(use_layer ? null_mount : mp);
147	if (use_layer)
148		RL(rump_sys_unmount(null_mount, 0));
149}
150
151static void
152noneopen(const atf_tc_t *tc, const char *mp)
153{
154
155	basic_test(tc, mp, 0, false, NULL, NULL);
156}
157
158static void
159readopen(const atf_tc_t *tc, const char *mp)
160{
161
162	basic_test(tc, mp, 0, false, open_file_ro, close_file);
163}
164
165static void
166writeopen(const atf_tc_t *tc, const char *mp)
167{
168
169	basic_test(tc, mp, EBUSY, false, open_file_rw, close_file);
170}
171
172static void
173read_unlinked(const atf_tc_t *tc, const char *mp)
174{
175
176	basic_test(tc, mp, EBUSY, false, open_file_ro_unlink, close_file);
177}
178
179static void
180layer_noneopen(const atf_tc_t *tc, const char *mp)
181{
182
183	basic_test(tc, mp, 0, true, NULL, NULL);
184}
185
186static void
187layer_readopen(const atf_tc_t *tc, const char *mp)
188{
189
190	basic_test(tc, mp, 0, true, open_file_ro, close_file);
191}
192
193static void
194layer_writeopen(const atf_tc_t *tc, const char *mp)
195{
196
197	basic_test(tc, mp, EBUSY, true, open_file_rw, close_file);
198}
199
200static void
201layer_read_unlinked(const atf_tc_t *tc, const char *mp)
202{
203
204	basic_test(tc, mp, EBUSY, true, open_file_ro_unlink, close_file);
205}
206
207ATF_TC_FSAPPLY(noneopen, "remount r/o with no file open");
208ATF_TC_FSAPPLY(readopen, "remount r/o with file open for reading");
209ATF_TC_FSAPPLY(writeopen, "remount r/o with file open for writing");
210ATF_TC_FSAPPLY(read_unlinked,
211    "remount r/o with unlinked file open for reading");
212ATF_TC_FSAPPLY(layer_noneopen, "remount r/o with no file open on layer");
213ATF_TC_FSAPPLY(layer_readopen,
214    "remount r/o with file open for reading on layer");
215ATF_TC_FSAPPLY(layer_writeopen,
216    "remount r/o with file open for writing on layer");
217ATF_TC_FSAPPLY(layer_read_unlinked,
218    "remount r/o with unlinked file open for reading on layer");
219
220ATF_TP_ADD_TCS(tp)
221{
222
223	ATF_TP_FSAPPLY(noneopen);
224	ATF_TP_FSAPPLY(readopen);
225	ATF_TP_FSAPPLY(writeopen);
226	ATF_TP_FSAPPLY(read_unlinked);
227	ATF_TP_FSAPPLY(layer_noneopen);
228	ATF_TP_FSAPPLY(layer_readopen);
229	ATF_TP_FSAPPLY(layer_writeopen);
230	ATF_TP_FSAPPLY(layer_read_unlinked);
231
232	return atf_no_error();
233}
234