2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2019 The FreeBSD Foundation
6 * This software was developed by BFF Storage Systems, LLC under sponsorship
7 * from the FreeBSD Foundation.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
34 #include <sys/types.h>
38 #include "fuse_kernel.h"
41 #include <gmock/gmock.h>
43 #define TIME_T_MAX (std::numeric_limits<time_t>::max())
46 * A pseudo-fuse errno used indicate that a fuse operation should have no
47 * response, at least not immediately
49 #define FUSE_NORESPONSE 9999
51 #define SET_OUT_HEADER_LEN(out, variant) { \
52 (out).header.len = (sizeof((out).header) + \
53 sizeof((out).body.variant)); \
57 * Create an expectation on FUSE_LOOKUP and return it so the caller can set
60 * This must be a macro instead of a method because EXPECT_CALL returns a type
61 * with a deleted constructor.
63 #define EXPECT_LOOKUP(parent, path) \
64 EXPECT_CALL(*m_mock, process( \
65 ResultOf([=](auto in) { \
66 return (in.header.opcode == FUSE_LOOKUP && \
67 in.header.nodeid == (parent) && \
68 strcmp(in.body.lookup, (path)) == 0); \
76 * The maximum that a test case can set max_write, limited by the buffer
77 * supplied when reading from /dev/fuse. This limitation is imposed by
78 * fusefs-libs, but not by the FUSE protocol.
80 const uint32_t max_max_write = 0x20000;
83 /* This struct isn't defined by fuse_kernel.h or libfuse, but it should be */
84 struct fuse_create_out {
85 struct fuse_entry_out entry;
86 struct fuse_open_out open;
89 /* Protocol 7.8 version of struct fuse_attr */
108 /* Protocol 7.8 version of struct fuse_attr_out */
109 struct fuse_attr_out_7_8
112 uint32_t attr_valid_nsec;
114 struct fuse_attr_7_8 attr;
117 /* Protocol 7.8 version of struct fuse_entry_out */
118 struct fuse_entry_out_7_8 {
119 uint64_t nodeid; /* Inode ID */
120 uint64_t generation; /* Inode generation: nodeid:gen must
121 be unique for the fs's lifetime */
122 uint64_t entry_valid; /* Cache timeout for the name */
123 uint64_t attr_valid; /* Cache timeout for the attributes */
124 uint32_t entry_valid_nsec;
125 uint32_t attr_valid_nsec;
126 struct fuse_attr_7_8 attr;
129 /* Output struct for FUSE_CREATE for protocol 7.8 servers */
130 struct fuse_create_out_7_8 {
131 struct fuse_entry_out_7_8 entry;
132 struct fuse_open_out open;
135 /* Output struct for FUSE_INIT for protocol 7.22 and earlier servers */
136 struct fuse_init_out_7_22 {
139 uint32_t max_readahead;
141 uint16_t max_background;
142 uint16_t congestion_threshold;
146 union fuse_payloads_in {
147 fuse_access_in access;
150 * In fusefs-libs 3.4.2 and below the buffer size is fixed at 0x21000
151 * minus the header sizes. fusefs-libs 3.4.3 (and FUSE Protocol 7.29)
152 * add a FUSE_MAX_PAGES option that allows it to be greater.
154 * See fuse_kern_chan.c in fusefs-libs 2.9.9 and below, or
155 * FUSE_DEFAULT_MAX_PAGES_PER_REQ in fusefs-libs 3.4.3 and above.
158 max_max_write + 0x1000 - sizeof(struct fuse_in_header)
160 fuse_copy_file_range_in copy_file_range;
161 fuse_create_in create;
162 fuse_fallocate_in fallocate;
165 fuse_fsync_in fsyncdir;
166 fuse_forget_in forget;
167 fuse_getattr_in getattr;
168 fuse_interrupt_in interrupt;
170 fuse_getxattr_in getxattr;
173 fuse_listxattr_in listxattr;
179 fuse_open_in opendir;
181 fuse_read_in readdir;
182 fuse_release_in release;
183 fuse_release_in releasedir;
184 fuse_rename_in rename;
186 fuse_setattr_in setattr;
187 fuse_setxattr_in setxattr;
194 struct mockfs_buf_in {
195 fuse_in_header header;
196 union fuse_payloads_in body;
199 union fuse_payloads_out {
201 fuse_attr_out_7_8 attr_7_8;
203 fuse_create_out create;
204 fuse_create_out_7_8 create_7_8;
206 * The protocol places no limits on the size of bytes. Choose
207 * a size big enough for anything we'll test.
209 uint8_t bytes[0x20000];
210 fuse_entry_out entry;
211 fuse_entry_out_7_8 entry_7_8;
213 fuse_getxattr_out getxattr;
215 fuse_init_out_7_22 init_7_22;
216 fuse_lseek_out lseek;
217 /* The inval_entry structure should be followed by the entry's name */
218 fuse_notify_inval_entry_out inval_entry;
219 fuse_notify_inval_inode_out inval_inode;
220 /* The store structure should be followed by the data to store */
221 fuse_notify_store_out store;
222 fuse_listxattr_out listxattr;
224 fuse_statfs_out statfs;
226 * The protocol places no limits on the length of the string. This is
227 * merely convenient for testing.
230 fuse_write_out write;
233 struct mockfs_buf_out {
234 fuse_out_header header;
235 union fuse_payloads_out body;
237 /* Default constructor: zero everything */
239 memset(this, 0, sizeof(*this));
243 /* A function that can be invoked in place of MockFS::process */
244 typedef std::function<void (const mockfs_buf_in& in,
245 std::vector<std::unique_ptr<mockfs_buf_out>> &out)>
249 * Helper function used for setting an error expectation for any fuse operation.
250 * The operation will return the supplied error
252 ProcessMockerT ReturnErrno(int error);
254 /* Helper function used for returning negative cache entries for LOOKUP */
255 ProcessMockerT ReturnNegativeCache(const struct timespec *entry_valid);
257 /* Helper function used for returning a single immediate response */
258 ProcessMockerT ReturnImmediate(
259 std::function<void(const mockfs_buf_in& in,
260 struct mockfs_buf_out &out)> f);
262 /* How the daemon should check /dev/fuse for readiness */
271 * Fake FUSE filesystem
273 * "Mounts" a filesystem to a temporary directory and services requests
274 * according to the programmed expectations.
276 * Operates directly on the fusefs(4) kernel API, not the libfuse(3) user api.
280 * thread id of the fuse daemon thread
282 * It must run in a separate thread so it doesn't deadlock with the
285 pthread_t m_daemon_id;
287 /* file descriptor of /dev/fuse control device */
288 volatile int m_fuse_fd;
290 /* The minor version of the kernel API that this mock daemon targets */
291 uint32_t m_kernel_minor_version;
295 /* The max_readahead file system option */
296 uint32_t m_maxreadahead;
298 /* pid of the test process */
301 /* The unique value of the header of the last received operation */
302 uint64_t m_last_unique;
304 /* Method the daemon should use for I/O to and from /dev/fuse */
305 enum poll_method m_pm;
307 /* Timestamp granularity in nanoseconds */
308 unsigned m_time_gran;
310 void audit_request(const mockfs_buf_in &in, ssize_t buflen);
311 void debug_request(const mockfs_buf_in&, ssize_t buflen);
312 void debug_response(const mockfs_buf_out&);
314 /* Initialize a session after mounting */
315 void init(uint32_t flags);
317 /* Is pid from a process that might be involved in the test? */
318 bool pid_ok(pid_t pid);
320 /* Default request handler */
321 void process_default(const mockfs_buf_in&,
322 std::vector<std::unique_ptr<mockfs_buf_out>>&);
324 /* Entry point for the daemon thread */
325 static void* service(void*);
328 * Read, but do not process, a single request from the kernel
330 * @param in Return storage for the FUSE request
331 * @param res Return value of read(2). If positive, the amount of
332 * data read from the fuse device.
334 void read_request(mockfs_buf_in& in, ssize_t& res);
336 /* Write a single response back to the kernel */
337 void write_response(const mockfs_buf_out &out);
340 /* pid of child process, for two-process test cases */
343 /* Maximum size of a FUSE_WRITE write */
347 * Number of events that were available from /dev/fuse after the last
348 * kevent call. Only valid when m_pm = KQ.
352 /* Tell the daemon to shut down ASAP */
355 /* Create a new mockfs and mount it to a tempdir */
356 MockFS(int max_readahead, bool allow_other,
357 bool default_permissions, bool push_symlinks_in, bool ro,
358 enum poll_method pm, uint32_t flags,
359 uint32_t kernel_minor_version, uint32_t max_write, bool async,
360 bool no_clusterr, unsigned time_gran, bool nointr,
365 /* Kill the filesystem daemon without unmounting the filesystem */
368 /* Process FUSE requests endlessly */
372 * Send an asynchronous notification to invalidate a directory entry.
373 * Similar to libfuse's fuse_lowlevel_notify_inval_entry
375 * This method will block until the client has responded, so it should
376 * generally be run in a separate thread from request processing.
378 * @param parent Parent directory's inode number
379 * @param name name of dirent to invalidate
380 * @param namelen size of name, including the NUL
382 int notify_inval_entry(ino_t parent, const char *name, size_t namelen);
385 * Send an asynchronous notification to invalidate an inode's cached
386 * data and/or attributes. Similar to libfuse's
387 * fuse_lowlevel_notify_inval_inode.
389 * This method will block until the client has responded, so it should
390 * generally be run in a separate thread from request processing.
392 * @param ino File's inode number
393 * @param off offset at which to begin invalidation. A
394 * negative offset means to invalidate attributes
396 * @param len Size of region of data to invalidate. 0 means
397 * to invalidate all cached data.
399 int notify_inval_inode(ino_t ino, off_t off, ssize_t len);
402 * Send an asynchronous notification to store data directly into an
403 * inode's cache. Similar to libfuse's fuse_lowlevel_notify_store.
405 * This method will block until the client has responded, so it should
406 * generally be run in a separate thread from request processing.
408 * @param ino File's inode number
409 * @param off Offset at which to store data
410 * @param data Pointer to the data to cache
411 * @param len Size of data
413 int notify_store(ino_t ino, off_t off, const void* data, ssize_t size);
418 * This method is expected to provide the responses to each FUSE
419 * operation. For an immediate response, push one buffer into out.
420 * For a delayed response, push nothing. For an immediate response
421 * plus a delayed response to an earlier operation, push two bufs.
422 * Test cases must define each response using Googlemock expectations
424 MOCK_METHOD2(process, void(const mockfs_buf_in&,
425 std::vector<std::unique_ptr<mockfs_buf_out>>&));
427 /* Gracefully unmount */