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fusefs: support VOP_MKNOD
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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2019 The FreeBSD Foundation
5  *
6  * This software was developed by BFF Storage Systems, LLC under sponsorship
7  * from the FreeBSD Foundation.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30
31 extern "C" {
32 #include <fcntl.h>
33 }
34
35 #include "mockfs.hh"
36 #include "utils.hh"
37
38 using namespace testing;
39
40 class Open: public FuseTest {
41
42 public:
43
44 /* Test an OK open of a file with the given flags */
45 void test_ok(int os_flags, int fuse_flags) {
46         const char FULLPATH[] = "mountpoint/some_file.txt";
47         const char RELPATH[] = "some_file.txt";
48         uint64_t ino = 42;
49         int fd;
50
51         FuseTest::expect_lookup(RELPATH, ino, S_IFREG | 0644, 0, 1);
52         EXPECT_CALL(*m_mock, process(
53                 ResultOf([=](auto in) {
54                         return (in->header.opcode == FUSE_OPEN &&
55                                 in->body.open.flags == (uint32_t)fuse_flags &&
56                                 in->header.nodeid == ino);
57                 }, Eq(true)),
58                 _)
59         ).WillOnce(Invoke(ReturnImmediate([](auto in __unused, auto out) {
60                 out->header.len = sizeof(out->header);
61                 SET_OUT_HEADER_LEN(out, open);
62         })));
63
64         /* Until the attr cache is working, we may send an additional GETATTR */
65         EXPECT_CALL(*m_mock, process(
66                 ResultOf([=](auto in) {
67                         return (in->header.opcode == FUSE_GETATTR &&
68                                 in->header.nodeid == ino);
69                 }, Eq(true)),
70                 _)
71         ).WillRepeatedly(Invoke(ReturnImmediate([=](auto i __unused, auto out) {
72                 SET_OUT_HEADER_LEN(out, attr);
73                 out->body.attr.attr.ino = ino;  // Must match nodeid
74                 out->body.attr.attr.mode = S_IFREG | 0644;
75         })));
76
77         fd = open(FULLPATH, os_flags);
78         EXPECT_LE(0, fd) << strerror(errno);
79         /* Deliberately leak fd.  close(2) will be tested in release.cc */
80 }
81 };
82
83
84 /* 
85  * fusefs(5) does not support I/O on device nodes (neither does UFS).  But it
86  * shouldn't crash
87  */
88 TEST_F(Open, chr)
89 {
90         const char FULLPATH[] = "mountpoint/zero";
91         const char RELPATH[] = "zero";
92         uint64_t ino = 42;
93
94         EXPECT_LOOKUP(1, RELPATH)
95         .WillRepeatedly(Invoke(ReturnImmediate([=](auto in __unused, auto out) {
96                 SET_OUT_HEADER_LEN(out, entry);
97                 out->body.entry.attr.mode = S_IFCHR | 0644;
98                 out->body.entry.nodeid = ino;
99                 out->body.entry.attr.nlink = 1;
100                 out->body.entry.attr_valid = UINT64_MAX;
101                 out->body.entry.attr.rdev = 44; /* /dev/zero's rdev */
102         })));
103
104         ASSERT_EQ(-1, open(FULLPATH, O_RDONLY));
105         EXPECT_EQ(EOPNOTSUPP, errno);
106 }
107
108 /* 
109  * The fuse daemon fails the request with enoent.  This usually indicates a
110  * race condition: some other FUSE client removed the file in between when the
111  * kernel checked for it with lookup and tried to open it
112  */
113 TEST_F(Open, enoent)
114 {
115         const char FULLPATH[] = "mountpoint/some_file.txt";
116         const char RELPATH[] = "some_file.txt";
117         uint64_t ino = 42;
118
119         expect_lookup(RELPATH, ino, S_IFREG | 0644, 0, 1);
120         EXPECT_CALL(*m_mock, process(
121                 ResultOf([=](auto in) {
122                         return (in->header.opcode == FUSE_OPEN &&
123                                 in->header.nodeid == ino);
124                 }, Eq(true)),
125                 _)
126         ).WillOnce(Invoke(ReturnErrno(ENOENT)));
127         EXPECT_NE(0, open(FULLPATH, O_RDONLY));
128         EXPECT_EQ(ENOENT, errno);
129 }
130
131 /* 
132  * The daemon is responsible for checking file permissions (unless the
133  * default_permissions mount option was used)
134  */
135 TEST_F(Open, eperm)
136 {
137         const char FULLPATH[] = "mountpoint/some_file.txt";
138         const char RELPATH[] = "some_file.txt";
139         uint64_t ino = 42;
140
141         expect_lookup(RELPATH, ino, S_IFREG | 0644, 0, 1);
142         EXPECT_CALL(*m_mock, process(
143                 ResultOf([=](auto in) {
144                         return (in->header.opcode == FUSE_OPEN &&
145                                 in->header.nodeid == ino);
146                 }, Eq(true)),
147                 _)
148         ).WillOnce(Invoke(ReturnErrno(EPERM)));
149         EXPECT_NE(0, open(FULLPATH, O_RDONLY));
150         EXPECT_EQ(EPERM, errno);
151 }
152
153 /* fusefs(5) does not yet support I/O on fifos.  But it shouldn't crash. */
154 TEST_F(Open, fifo)
155 {
156         const char FULLPATH[] = "mountpoint/zero";
157         const char RELPATH[] = "zero";
158         uint64_t ino = 42;
159
160         EXPECT_LOOKUP(1, RELPATH)
161         .WillRepeatedly(Invoke(ReturnImmediate([=](auto in __unused, auto out) {
162                 SET_OUT_HEADER_LEN(out, entry);
163                 out->body.entry.attr.mode = S_IFIFO | 0644;
164                 out->body.entry.nodeid = ino;
165                 out->body.entry.attr.nlink = 1;
166                 out->body.entry.attr_valid = UINT64_MAX;
167         })));
168
169         ASSERT_EQ(-1, open(FULLPATH, O_RDONLY));
170         EXPECT_EQ(EOPNOTSUPP, errno);
171 }
172
173 /* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236340 */
174 TEST_F(Open, DISABLED_o_append)
175 {
176         test_ok(O_WRONLY | O_APPEND, O_WRONLY | O_APPEND);
177 }
178
179 /* The kernel is supposed to filter out this flag */
180 TEST_F(Open, o_creat)
181 {
182         test_ok(O_WRONLY | O_CREAT, O_WRONLY);
183 }
184
185 /* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236340 */
186 TEST_F(Open, DISABLED_o_direct)
187 {
188         test_ok(O_WRONLY | O_DIRECT, O_WRONLY | O_DIRECT);
189 }
190
191 /* The kernel is supposed to filter out this flag */
192 TEST_F(Open, o_excl)
193 {
194         test_ok(O_WRONLY | O_EXCL, O_WRONLY);
195 }
196
197 /* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236329 */
198 TEST_F(Open, DISABLED_o_exec)
199 {
200         test_ok(O_EXEC, O_EXEC);
201 }
202
203 /* The kernel is supposed to filter out this flag */
204 TEST_F(Open, o_noctty)
205 {
206         test_ok(O_WRONLY | O_NOCTTY, O_WRONLY);
207 }
208
209 TEST_F(Open, o_rdonly)
210 {
211         test_ok(O_RDONLY, O_RDONLY);
212 }
213
214 /* https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236340 */
215 TEST_F(Open, DISABLED_o_trunc)
216 {
217         test_ok(O_WRONLY | O_TRUNC, O_WRONLY | O_TRUNC);
218 }
219
220 TEST_F(Open, o_wronly)
221 {
222         test_ok(O_WRONLY, O_WRONLY);
223 }
224
225 TEST_F(Open, o_rdwr)
226 {
227         test_ok(O_RDWR, O_RDWR);
228 }
229