libfuse: lib/helper.c Source File

libfuse

helper.c
1 /*
2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu>
4
5 Helper functions to create (simple) standalone programs. With the
6 aid of these functions it should be possible to create full FUSE
7 file system by implementing nothing but the request handlers.
8
9 This program can be distributed under the terms of the GNU LGPLv2.
10 See the file COPYING.LIB.
11 */
12
13 #include "config.h"
14 #include "fuse_i.h"
15 #include "fuse_misc.h"
16 #include "fuse_opt.h"
17 #include "fuse_lowlevel.h"
18 #include "mount_util.h"
19
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <stddef.h>
23 #include <unistd.h>
24 #include <string.h>
25 #include <limits.h>
26 #include <errno.h>
27 #include <sys/param.h>
28
29 #define FUSE_HELPER_OPT(t, p) \
30 { t, offsetof(struct fuse_cmdline_opts, p), 1 }
31
32 static const struct fuse_opt fuse_helper_opts[] = {
33 FUSE_HELPER_OPT("-h", show_help),
34 FUSE_HELPER_OPT("--help", show_help),
35 FUSE_HELPER_OPT("-V", show_version),
36 FUSE_HELPER_OPT("--version", show_version),
37 FUSE_HELPER_OPT("-d", debug),
38 FUSE_HELPER_OPT("debug", debug),
39 FUSE_HELPER_OPT("-d", foreground),
40 FUSE_HELPER_OPT("debug", foreground),
41 FUSE_OPT_KEY("-d", FUSE_OPT_KEY_KEEP),
42 FUSE_OPT_KEY("debug", FUSE_OPT_KEY_KEEP),
43 FUSE_HELPER_OPT("-f", foreground),
44 FUSE_HELPER_OPT("-s", singlethread),
45 FUSE_HELPER_OPT("fsname=", nodefault_subtype),
46 FUSE_OPT_KEY("fsname=", FUSE_OPT_KEY_KEEP),
47 #ifndef __FreeBSD__
48 FUSE_HELPER_OPT("subtype=", nodefault_subtype),
49 FUSE_OPT_KEY("subtype=", FUSE_OPT_KEY_KEEP),
50 #endif
51 FUSE_HELPER_OPT("clone_fd", clone_fd),
52 FUSE_HELPER_OPT("max_idle_threads=%u", max_idle_threads),
53 FUSE_HELPER_OPT("max_threads=%u", max_threads),
54 FUSE_OPT_END
55 };
56
57 struct fuse_conn_info_opts {
58 int atomic_o_trunc;
59 int no_remote_posix_lock;
60 int no_remote_flock;
61 int splice_write;
62 int splice_move;
63 int splice_read;
64 int no_splice_write;
65 int no_splice_move;
66 int no_splice_read;
67 int auto_inval_data;
68 int no_auto_inval_data;
69 int no_readdirplus;
70 int no_readdirplus_auto;
71 int async_dio;
72 int no_async_dio;
73 int writeback_cache;
74 int no_writeback_cache;
75 int async_read;
76 int sync_read;
77 unsigned max_write;
78 unsigned max_readahead;
79 unsigned max_background;
80 unsigned congestion_threshold;
81 unsigned time_gran;
82 int set_max_write;
83 int set_max_readahead;
84 int set_max_background;
85 int set_congestion_threshold;
86 int set_time_gran;
87 };
88
89 #define CONN_OPTION(t, p, v) \
90 { t, offsetof(struct fuse_conn_info_opts, p), v }
91 static const struct fuse_opt conn_info_opt_spec[] = {
92 CONN_OPTION("max_write=%u", max_write, 0),
93 CONN_OPTION("max_write=", set_max_write, 1),
94 CONN_OPTION("max_readahead=%u", max_readahead, 0),
95 CONN_OPTION("max_readahead=", set_max_readahead, 1),
96 CONN_OPTION("max_background=%u", max_background, 0),
97 CONN_OPTION("max_background=", set_max_background, 1),
98 CONN_OPTION("congestion_threshold=%u", congestion_threshold, 0),
99 CONN_OPTION("congestion_threshold=", set_congestion_threshold, 1),
100 CONN_OPTION("sync_read", sync_read, 1),
101 CONN_OPTION("async_read", async_read, 1),
102 CONN_OPTION("atomic_o_trunc", atomic_o_trunc, 1),
103 CONN_OPTION("no_remote_lock", no_remote_posix_lock, 1),
104 CONN_OPTION("no_remote_lock", no_remote_flock, 1),
105 CONN_OPTION("no_remote_flock", no_remote_flock, 1),
106 CONN_OPTION("no_remote_posix_lock", no_remote_posix_lock, 1),
107 CONN_OPTION("splice_write", splice_write, 1),
108 CONN_OPTION("no_splice_write", no_splice_write, 1),
109 CONN_OPTION("splice_move", splice_move, 1),
110 CONN_OPTION("no_splice_move", no_splice_move, 1),
111 CONN_OPTION("splice_read", splice_read, 1),
112 CONN_OPTION("no_splice_read", no_splice_read, 1),
113 CONN_OPTION("auto_inval_data", auto_inval_data, 1),
114 CONN_OPTION("no_auto_inval_data", no_auto_inval_data, 1),
115 CONN_OPTION("readdirplus=no", no_readdirplus, 1),
116 CONN_OPTION("readdirplus=yes", no_readdirplus, 0),
117 CONN_OPTION("readdirplus=yes", no_readdirplus_auto, 1),
118 CONN_OPTION("readdirplus=auto", no_readdirplus, 0),
119 CONN_OPTION("readdirplus=auto", no_readdirplus_auto, 0),
120 CONN_OPTION("async_dio", async_dio, 1),
121 CONN_OPTION("no_async_dio", no_async_dio, 1),
122 CONN_OPTION("writeback_cache", writeback_cache, 1),
123 CONN_OPTION("no_writeback_cache", no_writeback_cache, 1),
124 CONN_OPTION("time_gran=%u", time_gran, 0),
125 CONN_OPTION("time_gran=", set_time_gran, 1),
126 FUSE_OPT_END
127 };
128
129
130 void fuse_cmdline_help(void)
131 {
132 printf(" -h --help print help\n"
133 " -V --version print version\n"
134 " -d -o debug enable debug output (implies -f)\n"
135 " -f foreground operation\n"
136 " -s disable multi-threaded operation\n"
137 " -o clone_fd use separate fuse device fd for each thread\n"
138 " (may improve performance)\n"
139 " -o max_idle_threads the maximum number of idle worker threads\n"
140 " allowed (default: -1)\n"
141 " -o max_threads the maximum number of worker threads\n"
142 " allowed (default: 10)\n");
143 }
144
145 static int fuse_helper_opt_proc(void *data, const char *arg, int key,
146 struct fuse_args *outargs)
147 {
148 (void) outargs;
149 struct fuse_cmdline_opts *opts = data;
150
151 switch (key) {
152 case FUSE_OPT_KEY_NONOPT:
153 if (!opts->mountpoint) {
154 if (fuse_mnt_parse_fuse_fd(arg) != -1) {
155 return fuse_opt_add_opt(&opts->mountpoint, arg);
156 }
157
158 char mountpoint[PATH_MAX] = "";
159 if (realpath(arg, mountpoint) == NULL) {
160 fuse_log(FUSE_LOG_ERR,
161 "fuse: bad mount point `%s': %s\n",
162 arg, strerror(errno));
163 return -1;
164 }
165 return fuse_opt_add_opt(&opts->mountpoint, mountpoint);
166 } else {
167 fuse_log(FUSE_LOG_ERR, "fuse: invalid argument `%s'\n", arg);
168 return -1;
169 }
170
171 default:
172 /* Pass through unknown options */
173 return 1;
174 }
175 }
176
177 /* Under FreeBSD, there is no subtype option so this
178 function actually sets the fsname */
179 static int add_default_subtype(const char *progname, struct fuse_args *args)
180 {
181 int res;
182 char *subtype_opt;
183
184 const char *basename = strrchr(progname, '/');
185 if (basename == NULL)
186 basename = progname;
187 else if (basename[1] != '\0')
188 basename++;
189
190 subtype_opt = (char *) malloc(strlen(basename) + 64);
191 if (subtype_opt == NULL) {
192 fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n");
193 return -1;
194 }
195 #ifdef __FreeBSD__
196 sprintf(subtype_opt, "-ofsname=%s", basename);
197 #else
198 sprintf(subtype_opt, "-osubtype=%s", basename);
199 #endif
200 res = fuse_opt_add_arg(args, subtype_opt);
201 free(subtype_opt);
202 return res;
203 }
204
205 int fuse_parse_cmdline_312(struct fuse_args *args,
206 struct fuse_cmdline_opts *opts);
207 FUSE_SYMVER("fuse_parse_cmdline_312", "fuse_parse_cmdline@@FUSE_3.12")
208 int fuse_parse_cmdline_312(struct fuse_args *args,
209 struct fuse_cmdline_opts *opts)
210 {
211 memset(opts, 0, sizeof(struct fuse_cmdline_opts));
212
213 opts->max_idle_threads = -1; /* new default in fuse version 3.12 */
214 opts->max_threads = 10;
215
216 if (fuse_opt_parse(args, opts, fuse_helper_opts,
217 fuse_helper_opt_proc) == -1)
218 return -1;
219
220 /* *Linux*: if neither -o subtype nor -o fsname are specified,
221 set subtype to program's basename.
222 *FreeBSD*: if fsname is not specified, set to program's
223 basename. */
224 if (!opts->nodefault_subtype)
225 if (add_default_subtype(args->argv[0], args) == -1)
226 return -1;
227
228 return 0;
229 }
230
234 int fuse_parse_cmdline_30(struct fuse_args *args,
235 struct fuse_cmdline_opts *opts);
236 FUSE_SYMVER("fuse_parse_cmdline_37", "fuse_parse_cmdline@FUSE_3.0")
237 int fuse_parse_cmdline_30(struct fuse_args *args,
238 struct fuse_cmdline_opts *out_opts)
239 {
240 struct fuse_cmdline_opts opts;
241
242
243 int rc = fuse_parse_cmdline_312(args, &opts);
244 if (rc == 0) {
245 /* copy up to the size of the old pre 3.12 struct */
246 memcpy(out_opts, &opts,
247 offsetof(struct fuse_cmdline_opts, max_idle_threads) +
248 sizeof(opts.max_idle_threads));
249 }
250
251 return rc;
252 }
253
257 #if (defined(__UCLIBC__) || defined(__APPLE__))
258 int fuse_parse_cmdline(struct fuse_args *args,
259 struct fuse_cmdline_opts *opts)
260 {
261 return fuse_parse_cmdline_30(args, out_opts);
262 }
263 #endif
264
265
266 int fuse_daemonize(int foreground)
267 {
268 if (!foreground) {
269 int nullfd;
270 int waiter[2];
271 char completed;
272
273 if (pipe(waiter)) {
274 perror("fuse_daemonize: pipe");
275 return -1;
276 }
277
278 /*
279 * demonize current process by forking it and killing the
280 * parent. This makes current process as a child of 'init'.
281 */
282 switch(fork()) {
283 case -1:
284 perror("fuse_daemonize: fork");
285 return -1;
286 case 0:
287 break;
288 default:
289 (void) read(waiter[0], &completed, sizeof(completed));
290 _exit(0);
291 }
292
293 if (setsid() == -1) {
294 perror("fuse_daemonize: setsid");
295 return -1;
296 }
297
298 (void) chdir("/");
299
300 nullfd = open("/dev/null", O_RDWR, 0);
301 if (nullfd != -1) {
302 (void) dup2(nullfd, 0);
303 (void) dup2(nullfd, 1);
304 (void) dup2(nullfd, 2);
305 if (nullfd > 2)
306 close(nullfd);
307 }
308
309 /* Propagate completion of daemon initialization */
310 completed = 1;
311 (void) write(waiter[1], &completed, sizeof(completed));
312 close(waiter[0]);
313 close(waiter[1]);
314 } else {
315 (void) chdir("/");
316 }
317 return 0;
318 }
319
320 int fuse_main_real(int argc, char *argv[], const struct fuse_operations *op,
321 size_t op_size, void *user_data)
322 {
323 struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
324 struct fuse *fuse;
325 struct fuse_cmdline_opts opts;
326 int res;
327 struct fuse_loop_config *loop_config = NULL;
328
329 if (fuse_parse_cmdline(&args, &opts) != 0)
330 return 1;
331
332 if (opts.show_version) {
333 printf("FUSE library version %s\n", PACKAGE_VERSION);
334 fuse_lowlevel_version();
335 res = 0;
336 goto out1;
337 }
338
339 if (opts.show_help) {
340 if(args.argv[0][0] != '\0')
341 printf("usage: %s [options] <mountpoint>\n\n",
342 args.argv[0]);
343 printf("FUSE options:\n");
344 fuse_cmdline_help();
345 fuse_lib_help(&args);
346 res = 0;
347 goto out1;
348 }
349
350 if (!opts.show_help &&
351 !opts.mountpoint) {
352 fuse_log(FUSE_LOG_ERR, "error: no mountpoint specified\n");
353 res = 2;
354 goto out1;
355 }
356
357
358 fuse = fuse_new_31(&args, op, op_size, user_data);
359 if (fuse == NULL) {
360 res = 3;
361 goto out1;
362 }
363
364 if (fuse_mount(fuse,opts.mountpoint) != 0) {
365 res = 4;
366 goto out2;
367 }
368
369 if (fuse_daemonize(opts.foreground) != 0) {
370 res = 5;
371 goto out3;
372 }
373
374 struct fuse_session *se = fuse_get_session(fuse);
375 if (fuse_set_signal_handlers(se) != 0) {
376 res = 6;
377 goto out3;
378 }
379
380 if (opts.singlethread)
381 res = fuse_loop(fuse);
382 else {
383 loop_config = fuse_loop_cfg_create();
384 if (loop_config == NULL) {
385 res = 7;
386 goto out3;
387 }
388
389 fuse_loop_cfg_set_clone_fd(loop_config, opts.clone_fd);
390
391 fuse_loop_cfg_set_idle_threads(loop_config, opts.max_idle_threads);
392 res = fuse_loop_mt(fuse, loop_config);
393 }
394 if (res)
395 res = 8;
396
397 fuse_remove_signal_handlers(se);
398 out3:
399 fuse_unmount(fuse);
400 out2:
401 fuse_destroy(fuse);
402 out1:
403 fuse_loop_cfg_destroy(loop_config);
404 free(opts.mountpoint);
405 fuse_opt_free_args(&args);
406 return res;
407 }
408
409
410 void fuse_apply_conn_info_opts(struct fuse_conn_info_opts *opts,
411 struct fuse_conn_info *conn)
412 {
413 if(opts->set_max_write)
414 conn->max_write = opts->max_write;
415 if(opts->set_max_background)
416 conn->max_background = opts->max_background;
417 if(opts->set_congestion_threshold)
418 conn->congestion_threshold = opts->congestion_threshold;
419 if(opts->set_time_gran)
420 conn->time_gran = opts->time_gran;
421 if(opts->set_max_readahead)
422 conn->max_readahead = opts->max_readahead;
423
424 #define LL_ENABLE(cond,cap) \
425 if (cond) conn->want |= (cap)
426 #define LL_DISABLE(cond,cap) \
427 if (cond) conn->want &= ~(cap)
428
429 LL_ENABLE(opts->splice_read, FUSE_CAP_SPLICE_READ);
430 LL_DISABLE(opts->no_splice_read, FUSE_CAP_SPLICE_READ);
431
432 LL_ENABLE(opts->splice_write, FUSE_CAP_SPLICE_WRITE);
433 LL_DISABLE(opts->no_splice_write, FUSE_CAP_SPLICE_WRITE);
434
435 LL_ENABLE(opts->splice_move, FUSE_CAP_SPLICE_MOVE);
436 LL_DISABLE(opts->no_splice_move, FUSE_CAP_SPLICE_MOVE);
437
438 LL_ENABLE(opts->auto_inval_data, FUSE_CAP_AUTO_INVAL_DATA);
439 LL_DISABLE(opts->no_auto_inval_data, FUSE_CAP_AUTO_INVAL_DATA);
440
441 LL_DISABLE(opts->no_readdirplus, FUSE_CAP_READDIRPLUS);
442 LL_DISABLE(opts->no_readdirplus_auto, FUSE_CAP_READDIRPLUS_AUTO);
443
444 LL_ENABLE(opts->async_dio, FUSE_CAP_ASYNC_DIO);
445 LL_DISABLE(opts->no_async_dio, FUSE_CAP_ASYNC_DIO);
446
447 LL_ENABLE(opts->writeback_cache, FUSE_CAP_WRITEBACK_CACHE);
448 LL_DISABLE(opts->no_writeback_cache, FUSE_CAP_WRITEBACK_CACHE);
449
450 LL_ENABLE(opts->async_read, FUSE_CAP_ASYNC_READ);
451 LL_DISABLE(opts->sync_read, FUSE_CAP_ASYNC_READ);
452
453 LL_DISABLE(opts->no_remote_posix_lock, FUSE_CAP_POSIX_LOCKS);
454 LL_DISABLE(opts->no_remote_flock, FUSE_CAP_FLOCK_LOCKS);
455 }
456
457 struct fuse_conn_info_opts* fuse_parse_conn_info_opts(struct fuse_args *args)
458 {
459 struct fuse_conn_info_opts *opts;
460
461 opts = calloc(1, sizeof(struct fuse_conn_info_opts));
462 if(opts == NULL) {
463 fuse_log(FUSE_LOG_ERR, "calloc failed\n");
464 return NULL;
465 }
466 if(fuse_opt_parse(args, opts, conn_info_opt_spec, NULL) == -1) {
467 free(opts);
468 return NULL;
469 }
470 return opts;
471 }
472
473 int fuse_open_channel(const char *mountpoint, const char* options)
474 {
475 struct mount_opts *opts = NULL;
476 int fd = -1;
477 const char *argv[] = { "", "-o", options };
478 int argc = sizeof(argv) / sizeof(argv[0]);
479 struct fuse_args args = FUSE_ARGS_INIT(argc, (char**) argv);
480
481 opts = parse_mount_opts(&args);
482 if (opts == NULL)
483 return -1;
484
485 fd = fuse_kern_mount(mountpoint, opts);
486 destroy_mount_opts(opts);
487
488 return fd;
489 }
fuse_get_session
struct fuse_session * fuse_get_session(struct fuse *f)
Definition: fuse.c:4509
fuse_mount
int fuse_mount(struct fuse *f, const char *mountpoint)
Definition: fuse.c:5108
fuse_destroy
void fuse_destroy(struct fuse *f)
Definition: fuse.c:5058
fuse_loop
int fuse_loop(struct fuse *f)
Definition: fuse.c:4566
fuse_lib_help
void fuse_lib_help(struct fuse_args *args)
Definition: fuse.c:4701
fuse_open_channel
int fuse_open_channel(const char *mountpoint, const char *options)
Definition: helper.c:424
fuse_unmount
void fuse_unmount(struct fuse *f)
Definition: fuse.c:5113
fuse_main_real
int fuse_main_real(int argc, char *argv[], const struct fuse_operations *op, size_t op_size, void *private_data)
Definition: helper.c:279
FUSE_CAP_AUTO_INVAL_DATA
#define FUSE_CAP_AUTO_INVAL_DATA
Definition: fuse_common.h:240
fuse_set_signal_handlers
int fuse_set_signal_handlers(struct fuse_session *se)
Definition: fuse_signals.c:62
FUSE_CAP_SPLICE_READ
#define FUSE_CAP_SPLICE_READ
Definition: fuse_common.h:198
FUSE_CAP_WRITEBACK_CACHE
#define FUSE_CAP_WRITEBACK_CACHE
Definition: fuse_common.h:296
FUSE_CAP_ASYNC_READ
#define FUSE_CAP_ASYNC_READ
Definition: fuse_common.h:141
FUSE_CAP_SPLICE_WRITE
#define FUSE_CAP_SPLICE_WRITE
Definition: fuse_common.h:181
fuse_apply_conn_info_opts
void fuse_apply_conn_info_opts(struct fuse_conn_info_opts *opts, struct fuse_conn_info *conn)
Definition: helper.c:361
FUSE_CAP_POSIX_LOCKS
#define FUSE_CAP_POSIX_LOCKS
Definition: fuse_common.h:149
FUSE_CAP_READDIRPLUS_AUTO
#define FUSE_CAP_READDIRPLUS_AUTO
Definition: fuse_common.h:276
FUSE_CAP_ASYNC_DIO
#define FUSE_CAP_ASYNC_DIO
Definition: fuse_common.h:287
FUSE_CAP_READDIRPLUS
#define FUSE_CAP_READDIRPLUS
Definition: fuse_common.h:248
fuse_remove_signal_handlers
void fuse_remove_signal_handlers(struct fuse_session *se)
Definition: fuse_signals.c:79
FUSE_CAP_SPLICE_MOVE
#define FUSE_CAP_SPLICE_MOVE
Definition: fuse_common.h:189
fuse_daemonize
int fuse_daemonize(int foreground)
Definition: helper.c:225
fuse_parse_conn_info_opts
struct fuse_conn_info_opts * fuse_parse_conn_info_opts(struct fuse_args *args)
Definition: helper.c:408
FUSE_CAP_FLOCK_LOCKS
#define FUSE_CAP_FLOCK_LOCKS
Definition: fuse_common.h:211
fuse_log
void fuse_log(enum fuse_log_level level, const char *fmt,...)
Definition: fuse_log.c:33
fuse_cmdline_help
void fuse_cmdline_help(void)
Definition: helper.c:129
fuse_parse_cmdline
int fuse_parse_cmdline(struct fuse_args *args, struct fuse_cmdline_opts *opts)
Definition: helper.c:202
fuse_lowlevel_version
void fuse_lowlevel_version(void)
Definition: fuse_lowlevel.c:2691
fuse_opt_add_arg
int fuse_opt_add_arg(struct fuse_args *args, const char *arg)
Definition: fuse_opt.c:55
fuse_opt_free_args
void fuse_opt_free_args(struct fuse_args *args)
Definition: fuse_opt.c:34
FUSE_OPT_KEY
#define FUSE_OPT_KEY(templ, key)
Definition: fuse_opt.h:98
fuse_opt_parse
int fuse_opt_parse(struct fuse_args *args, void *data, const struct fuse_opt opts[], fuse_opt_proc_t proc)
Definition: fuse_opt.c:398
FUSE_OPT_KEY_NONOPT
#define FUSE_OPT_KEY_NONOPT
Definition: fuse_opt.h:137
FUSE_OPT_KEY_KEEP
#define FUSE_OPT_KEY_KEEP
Definition: fuse_opt.h:145
FUSE_ARGS_INIT
#define FUSE_ARGS_INIT(argc, argv)
Definition: fuse_opt.h:123
fuse_opt_add_opt
int fuse_opt_add_opt(char **opts, const char *opt)
Definition: fuse_opt.c:139
FUSE_OPT_END
#define FUSE_OPT_END
Definition: fuse_opt.h:104
fuse_loop_cfg_set_idle_threads
void fuse_loop_cfg_set_idle_threads(struct fuse_loop_config *config, unsigned int value)
Definition: fuse_loop_mt.c:459
fuse_loop_cfg_create
struct fuse_loop_config * fuse_loop_cfg_create(void)
Definition: fuse_loop_mt.c:424
fuse_loop_cfg_set_clone_fd
void fuse_loop_cfg_set_clone_fd(struct fuse_loop_config *config, unsigned int value)
Definition: fuse_loop_mt.c:471
fuse_loop_cfg_destroy
void fuse_loop_cfg_destroy(struct fuse_loop_config *config)
Definition: fuse_loop_mt.c:438
fuse_args
Definition: fuse_opt.h:109
fuse_args::argc
int argc
Definition: fuse_opt.h:111
fuse_args::argv
char ** argv
Definition: fuse_opt.h:114
fuse_cmdline_opts
Definition: fuse_lowlevel.h:1871
fuse_conn_info
Definition: fuse_common.h:421
fuse_conn_info::time_gran
unsigned time_gran
Definition: fuse_common.h:524
fuse_conn_info::congestion_threshold
unsigned congestion_threshold
Definition: fuse_common.h:507
fuse_conn_info::max_background
unsigned max_background
Definition: fuse_common.h:497
fuse_conn_info::max_readahead
unsigned max_readahead
Definition: fuse_common.h:454
fuse_conn_info::max_write
unsigned max_write
Definition: fuse_common.h:435
fuse_loop_config
Definition: fuse_common.h:107
fuse_operations
Definition: fuse.h:302
fuse_opt
Definition: fuse_opt.h:77