2 * Copyright (c) 2019 The FreeBSD Foundation
5 * This software was developed by BFF Storage Systems, LLC under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/types.h>
35 #include "fuse_kernel.h"
38 #include <gmock/gmock.h>
40 #define TIME_T_MAX (std::numeric_limits<time_t>::max())
42 #define SET_OUT_HEADER_LEN(out, variant) { \
43 (out)->header.len = (sizeof((out)->header) + \
44 sizeof((out)->body.variant)); \
48 * Create an expectation on FUSE_LOOKUP and return it so the caller can set
51 * This must be a macro instead of a method because EXPECT_CALL returns a type
52 * with a deleted constructor.
54 #define EXPECT_LOOKUP(parent, path) \
55 EXPECT_CALL(*m_mock, process( \
56 ResultOf([=](auto in) { \
57 return (in->header.opcode == FUSE_LOOKUP && \
58 in->header.nodeid == (parent) && \
59 strcmp(in->body.lookup, (path)) == 0); \
66 /* This struct isn't defined by fuse_kernel.h or libfuse, but it should be */
67 struct fuse_create_out {
68 struct fuse_entry_out entry;
69 struct fuse_open_out open;
72 union fuse_payloads_in {
73 fuse_access_in access;
74 /* value is from fuse_kern_chan.c in fusefs-libs */
75 uint8_t bytes[0x21000 - sizeof(struct fuse_in_header)];
77 fuse_forget_in forget;
85 fuse_release_in release;
86 fuse_rename_in rename;
88 fuse_setattr_in setattr;
93 struct mockfs_buf_in {
94 fuse_in_header header;
95 union fuse_payloads_in body;
98 union fuse_payloads_out {
100 fuse_create_out create;
101 /* The protocol places no limits on the size of bytes */
102 uint8_t bytes[0x2000];
103 fuse_entry_out entry;
106 fuse_statfs_out statfs;
108 * The protocol places no limits on the length of the string. This is
109 * merely convenient for testing.
112 fuse_write_out write;
115 struct mockfs_buf_out {
116 fuse_out_header header;
117 union fuse_payloads_out body;
120 /* A function that can be invoked in place of MockFS::process */
121 typedef std::function<void (const struct mockfs_buf_in *in,
122 struct mockfs_buf_out *out)>
126 * Helper function used for setting an error expectation for any fuse operation.
127 * The operation will return the supplied error
129 ProcessMockerT ReturnErrno(int error);
131 /* Helper function used for returning negative cache entries for LOOKUP */
132 std::function<void (const struct mockfs_buf_in *in, struct mockfs_buf_out *out)>
133 ReturnNegativeCache(const struct timespec *entry_valid);
136 * Fake FUSE filesystem
138 * "Mounts" a filesystem to a temporary directory and services requests
139 * according to the programmed expectations.
141 * Operates directly on the fuse(4) kernel API, not the libfuse(3) user api.
145 * thread id of the fuse daemon thread
147 * It must run in a separate thread so it doesn't deadlock with the
150 pthread_t m_daemon_id;
152 /* file descriptor of /dev/fuse control device */
155 /* pid of the test process */
158 /* Initialize a session after mounting */
161 /* Is pid from a process that might be involved in the test? */
162 bool pid_ok(pid_t pid);
164 /* Default request handler */
165 void process_default(const mockfs_buf_in*, mockfs_buf_out*);
167 /* Entry point for the daemon thread */
168 static void* service(void*);
170 /* Read, but do not process, a single request from the kernel */
171 void read_request(mockfs_buf_in*);
174 /* Maximum size of a FUSE_WRITE write */
175 uint32_t m_max_write;
177 /* Create a new mockfs and mount it to a tempdir */
181 /* Kill the filesystem daemon without unmounting the filesystem */
184 /* Process FUSE requests endlessly */
190 * This method is expected to provide the response to each FUSE
191 * operation. Responses must be immediate (so this method can't be used
192 * for testing a daemon with queue depth > 1). Test cases must define
193 * each response using Googlemock expectations
195 MOCK_METHOD2(process, void(const mockfs_buf_in*, mockfs_buf_out*));
197 /* Gracefully unmount */