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Commit | Line | Data |
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db0463bf | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
758ad80c | 2 | |
1f5596dd CB |
3 | #ifndef _GNU_SOURCE |
4 | #define _GNU_SOURCE | |
5 | #endif | |
6 | ||
f834b6bf SP |
7 | #include "config.h" |
8 | ||
4e3f18fb | 9 | #include <alloca.h> |
758ad80c | 10 | #include <dirent.h> |
1ece80b2 CB |
11 | #include <dlfcn.h> |
12 | #include <errno.h> | |
758ad80c | 13 | #include <fcntl.h> |
64a7d94d | 14 | #include <getopt.h> |
758ad80c | 15 | #include <libgen.h> |
b11c6ec0 | 16 | #include <pthread.h> |
1ece80b2 CB |
17 | #include <sched.h> |
18 | #include <stdbool.h> | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <time.h> | |
23 | #include <unistd.h> | |
24 | #include <wait.h> | |
41bb9357 | 25 | #include <linux/sched.h> |
5b2dfd85 | 26 | #include <sys/epoll.h> |
1ece80b2 CB |
27 | #include <sys/mount.h> |
28 | #include <sys/socket.h> | |
9dd49ba5 | 29 | #include <linux/limits.h> |
758ad80c | 30 | |
0a5da718 CB |
31 | #if HAVE_FUSE3 |
32 | #include <fuse3/fuse.h> | |
33 | #else | |
34 | #include <fuse.h> | |
35 | #endif | |
36 | ||
237e200e | 37 | #include "bindings.h" |
ec2043ed | 38 | #include "lxcfs_fuse_compat.h" |
12a60884 CB |
39 | #include "macro.h" |
40 | #include "memory_utils.h" | |
758ad80c | 41 | |
237e200e | 42 | void *dlopen_handle; |
b11c6ec0 | 43 | |
237e200e | 44 | /* Functions to keep track of number of threads using the library */ |
6d1308cb | 45 | |
237e200e SH |
46 | static int users_count; |
47 | static pthread_mutex_t user_count_mutex = PTHREAD_MUTEX_INITIALIZER; | |
b11c6ec0 | 48 | static void lock_mutex(pthread_mutex_t *l) |
2c51f8dd | 49 | { |
b11c6ec0 | 50 | int ret; |
2c51f8dd | 51 | |
02aeab4b CB |
52 | ret = pthread_mutex_lock(l); |
53 | if (ret) | |
54 | log_exit("%s - returned: %d\n", strerror(ret), ret); | |
b11c6ec0 | 55 | } |
2c51f8dd | 56 | |
237e200e | 57 | static void unlock_mutex(pthread_mutex_t *l) |
23ce2127 | 58 | { |
237e200e | 59 | int ret; |
2dc17609 | 60 | |
02aeab4b CB |
61 | ret = pthread_mutex_unlock(l); |
62 | if (ret) | |
63 | log_exit("%s - returned: %d\n", strerror(ret), ret); | |
237e200e | 64 | } |
2dc17609 | 65 | |
02aeab4b | 66 | static inline void users_lock(void) |
237e200e SH |
67 | { |
68 | lock_mutex(&user_count_mutex); | |
69 | } | |
b731895e | 70 | |
02aeab4b | 71 | static inline void users_unlock(void) |
237e200e SH |
72 | { |
73 | unlock_mutex(&user_count_mutex); | |
74 | } | |
e1068397 | 75 | |
a83618e2 JS |
76 | static pthread_t loadavg_pid = 0; |
77 | ||
78 | /* Returns zero on success */ | |
971aa868 CB |
79 | static int start_loadavg(void) |
80 | { | |
a83618e2 | 81 | char *error; |
9ce186dc | 82 | pthread_t (*__load_daemon)(int); |
a83618e2 | 83 | |
971aa868 CB |
84 | dlerror(); |
85 | __load_daemon = (pthread_t(*)(int))dlsym(dlopen_handle, "load_daemon"); | |
a83618e2 | 86 | error = dlerror(); |
971aa868 CB |
87 | if (error) |
88 | return log_error(-1, "%s - Failed to start loadavg daemon", error); | |
89 | ||
9ce186dc | 90 | loadavg_pid = __load_daemon(1); |
971aa868 | 91 | if (!loadavg_pid) |
a83618e2 JS |
92 | return -1; |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | /* Returns zero on success */ | |
971aa868 CB |
98 | static int stop_loadavg(void) |
99 | { | |
a83618e2 | 100 | char *error; |
9ce186dc | 101 | int (*__stop_load_daemon)(pthread_t); |
a83618e2 | 102 | |
971aa868 | 103 | __stop_load_daemon = (int (*)(pthread_t))dlsym(dlopen_handle, "stop_load_daemon"); |
a83618e2 | 104 | error = dlerror(); |
971aa868 CB |
105 | if (error) |
106 | return log_error(-1, "%s - Failed to stop loadavg daemon", error); | |
a83618e2 | 107 | |
971aa868 | 108 | if (__stop_load_daemon(loadavg_pid)) |
a83618e2 JS |
109 | return -1; |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
81d17d8f | 114 | static volatile sig_atomic_t need_reload; |
59120f04 | 115 | |
237e200e SH |
116 | /* do_reload - reload the dynamic library. Done under |
117 | * lock and when we know the user_count was 0 */ | |
118 | static void do_reload(void) | |
119 | { | |
1b8fb279 | 120 | int ret; |
9dd49ba5 | 121 | char lxcfs_lib_path[PATH_MAX]; |
a83618e2 JS |
122 | |
123 | if (loadavg_pid > 0) | |
124 | stop_loadavg(); | |
125 | ||
b8defc3d | 126 | if (dlopen_handle) { |
0b5e6053 | 127 | lxcfs_info("Closed liblxcfs.so"); |
237e200e | 128 | dlclose(dlopen_handle); |
b8defc3d | 129 | } |
e1068397 | 130 | |
59120f04 | 131 | /* First try loading using ld.so */ |
c7894bc7 CB |
132 | #ifdef RESOLVE_NOW |
133 | dlopen_handle = dlopen("liblxcfs.so", RTLD_NOW); | |
134 | #else | |
237e200e | 135 | dlopen_handle = dlopen("liblxcfs.so", RTLD_LAZY); |
c7894bc7 | 136 | #endif |
b8defc3d | 137 | if (dlopen_handle) { |
0b5e6053 | 138 | lxcfs_debug("Opened liblxcfs.so"); |
59120f04 | 139 | goto good; |
b8defc3d | 140 | } |
59120f04 | 141 | |
9dd49ba5 DK |
142 | #ifdef LIBDIR |
143 | /* LIBDIR: autoconf will setup this MACRO. Default value is $PREFIX/lib */ | |
1b8fb279 | 144 | ret = snprintf(lxcfs_lib_path, sizeof(lxcfs_lib_path), "%s/lxcfs/liblxcfs.so", LIBDIR); |
9dd49ba5 | 145 | #else |
1b8fb279 | 146 | ret = snprintf(lxcfs_lib_path, sizeof(lxcfs_lib_path), "/usr/local/lib/lxcfs/liblxcfs.so"); |
9dd49ba5 | 147 | #endif |
3cf1e562 | 148 | if (ret < 0 || (size_t)ret >= sizeof(lxcfs_lib_path)) |
1b8fb279 CB |
149 | log_exit("Failed to create path to open liblxcfs"); |
150 | ||
9dd49ba5 | 151 | dlopen_handle = dlopen(lxcfs_lib_path, RTLD_LAZY); |
1b8fb279 CB |
152 | if (!dlopen_handle) |
153 | log_exit("%s - Failed to open liblxcfs.so", dlerror()); | |
154 | else | |
0b5e6053 | 155 | lxcfs_debug("Opened %s", lxcfs_lib_path); |
59120f04 SH |
156 | |
157 | good: | |
a83618e2 JS |
158 | if (loadavg_pid > 0) |
159 | start_loadavg(); | |
160 | ||
59120f04 | 161 | if (need_reload) |
0b5e6053 | 162 | lxcfs_info("Reloaded LXCFS"); |
237e200e | 163 | need_reload = 0; |
23ce2127 SH |
164 | } |
165 | ||
237e200e | 166 | static void up_users(void) |
23ce2127 | 167 | { |
237e200e SH |
168 | users_lock(); |
169 | if (users_count == 0 && need_reload) | |
170 | do_reload(); | |
171 | users_count++; | |
172 | users_unlock(); | |
173 | } | |
23ce2127 | 174 | |
237e200e SH |
175 | static void down_users(void) |
176 | { | |
177 | users_lock(); | |
178 | users_count--; | |
179 | users_unlock(); | |
23ce2127 SH |
180 | } |
181 | ||
dee86006 | 182 | static void sigusr1_reload(int signo, siginfo_t *info, void *extra) |
237e200e | 183 | { |
237e200e | 184 | need_reload = 1; |
237e200e | 185 | } |
23ce2127 | 186 | |
237e200e SH |
187 | /* Functions to run the library methods */ |
188 | static int do_cg_getattr(const char *path, struct stat *sb) | |
aeb56147 | 189 | { |
237e200e | 190 | char *error; |
971aa868 CB |
191 | int (*__cg_getattr)(const char *path, struct stat *sb); |
192 | ||
193 | dlerror(); | |
194 | __cg_getattr = (int (*)(const char *, struct stat *))dlsym(dlopen_handle, "cg_getattr"); | |
237e200e | 195 | error = dlerror(); |
971aa868 CB |
196 | if (error) |
197 | return log_error(-1, "%s - Failed to find cg_getattr()", error); | |
aeb56147 | 198 | |
9ce186dc | 199 | return __cg_getattr(path, sb); |
aeb56147 SH |
200 | } |
201 | ||
237e200e | 202 | static int do_proc_getattr(const char *path, struct stat *sb) |
23ce2127 | 203 | { |
237e200e | 204 | char *error; |
971aa868 CB |
205 | int (*__proc_getattr)(const char *path, struct stat *sb); |
206 | ||
207 | dlerror(); | |
9ce186dc | 208 | __proc_getattr = (int (*)(const char *, struct stat *)) dlsym(dlopen_handle, "proc_getattr"); |
237e200e | 209 | error = dlerror(); |
971aa868 CB |
210 | if (error) |
211 | return log_error(-1, "%s - Failed to find proc_getattr()", error); | |
23ce2127 | 212 | |
9ce186dc | 213 | return __proc_getattr(path, sb); |
23ce2127 SH |
214 | } |
215 | ||
71f17cd2 YB |
216 | static int do_sys_getattr(const char *path, struct stat *sb) |
217 | { | |
71f17cd2 | 218 | char *error; |
971aa868 CB |
219 | int (*__sys_getattr)(const char *path, struct stat *sb); |
220 | ||
221 | dlerror(); | |
9ce186dc | 222 | __sys_getattr = (int (*)(const char *, struct stat *)) dlsym(dlopen_handle, "sys_getattr"); |
71f17cd2 | 223 | error = dlerror(); |
971aa868 CB |
224 | if (error) |
225 | return log_error(-1, "%s - Failed to find sys_getattr()", error); | |
71f17cd2 | 226 | |
9ce186dc | 227 | return __sys_getattr(path, sb); |
71f17cd2 YB |
228 | } |
229 | ||
237e200e | 230 | static int do_cg_read(const char *path, char *buf, size_t size, off_t offset, |
971aa868 | 231 | struct fuse_file_info *fi) |
23ce2127 | 232 | { |
971aa868 | 233 | char *error; |
9ce186dc CB |
234 | int (*__cg_read)(const char *path, char *buf, size_t size, off_t offset, |
235 | struct fuse_file_info *fi); | |
23ce2127 | 236 | |
971aa868 CB |
237 | dlerror(); |
238 | __cg_read = (int (*)(const char *, char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "cg_read"); | |
237e200e | 239 | error = dlerror(); |
971aa868 CB |
240 | if (error) |
241 | return log_error(-1, "%s - Failed to find cg_read()", error); | |
23ce2127 | 242 | |
9ce186dc | 243 | return __cg_read(path, buf, size, offset, fi); |
23ce2127 SH |
244 | } |
245 | ||
237e200e | 246 | static int do_proc_read(const char *path, char *buf, size_t size, off_t offset, |
9ce186dc | 247 | struct fuse_file_info *fi) |
23ce2127 | 248 | { |
971aa868 | 249 | char *error; |
9ce186dc CB |
250 | int (*__proc_read)(const char *path, char *buf, size_t size, |
251 | off_t offset, struct fuse_file_info *fi); | |
aeb56147 | 252 | |
971aa868 CB |
253 | dlerror(); |
254 | __proc_read = (int (*)(const char *, char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "proc_read"); | |
237e200e | 255 | error = dlerror(); |
971aa868 CB |
256 | if (error) |
257 | return log_error(-1, "%s - Failed to find proc_read()", error); | |
97f1f27b | 258 | |
9ce186dc | 259 | return __proc_read(path, buf, size, offset, fi); |
237e200e | 260 | } |
97f1f27b | 261 | |
71f17cd2 | 262 | static int do_sys_read(const char *path, char *buf, size_t size, off_t offset, |
971aa868 | 263 | struct fuse_file_info *fi) |
71f17cd2 | 264 | { |
971aa868 | 265 | char *error; |
9ce186dc CB |
266 | int (*__sys_read)(const char *path, char *buf, size_t size, |
267 | off_t offset, struct fuse_file_info *fi); | |
71f17cd2 | 268 | |
971aa868 CB |
269 | dlerror(); |
270 | __sys_read = (int (*)(const char *, char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "sys_read"); | |
71f17cd2 | 271 | error = dlerror(); |
971aa868 CB |
272 | if (error) |
273 | return log_error(-1, "%s - Failed to find sys_read()", error); | |
71f17cd2 | 274 | |
9ce186dc | 275 | return __sys_read(path, buf, size, offset, fi); |
71f17cd2 YB |
276 | } |
277 | ||
971aa868 CB |
278 | static int do_cg_write(const char *path, const char *buf, size_t size, |
279 | off_t offset, struct fuse_file_info *fi) | |
237e200e | 280 | { |
971aa868 | 281 | char *error; |
9ce186dc CB |
282 | int (*__cg_write)(const char *path, const char *buf, size_t size, |
283 | off_t offset, struct fuse_file_info *fi); | |
971aa868 CB |
284 | |
285 | dlerror(); | |
286 | __cg_write = (int (*)(const char *, const char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "cg_write"); | |
237e200e | 287 | error = dlerror(); |
971aa868 CB |
288 | if (error) |
289 | return log_error(-1, "%s - Failed to find cg_write()", error); | |
97f1f27b | 290 | |
9ce186dc | 291 | return __cg_write(path, buf, size, offset, fi); |
23ce2127 SH |
292 | } |
293 | ||
26b717d0 ZL |
294 | static int do_sys_write(const char *path, const char *buf, size_t size, |
295 | off_t offset, struct fuse_file_info *fi) | |
296 | { | |
297 | char *error; | |
298 | int (*__sys_write)(const char *path, const char *buf, size_t size, | |
299 | off_t offset, struct fuse_file_info *fi); | |
300 | ||
301 | dlerror(); | |
302 | __sys_write = (int (*)(const char *, const char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "sys_write"); | |
303 | error = dlerror(); | |
304 | if (error) | |
305 | return log_error(-1, "%s - Failed to find sys_write()", error); | |
306 | ||
307 | return __sys_write(path, buf, size, offset, fi); | |
308 | } | |
309 | ||
237e200e | 310 | static int do_cg_mkdir(const char *path, mode_t mode) |
41bb9357 | 311 | { |
237e200e | 312 | char *error; |
971aa868 | 313 | int (*__cg_mkdir)(const char *path, mode_t mode); |
9ce186dc | 314 | |
971aa868 CB |
315 | dlerror(); |
316 | __cg_mkdir = (int (*)(const char *, mode_t))dlsym(dlopen_handle, "cg_mkdir"); | |
237e200e | 317 | error = dlerror(); |
971aa868 CB |
318 | if (error) |
319 | return log_error(-1, "%s - Failed to find cg_mkdir()", error); | |
41bb9357 | 320 | |
9ce186dc | 321 | return __cg_mkdir(path, mode); |
41bb9357 SH |
322 | } |
323 | ||
237e200e | 324 | static int do_cg_chown(const char *path, uid_t uid, gid_t gid) |
0b6af11b | 325 | { |
237e200e | 326 | char *error; |
971aa868 | 327 | int (*__cg_chown)(const char *path, uid_t uid, gid_t gid); |
9ce186dc | 328 | |
971aa868 CB |
329 | dlerror(); |
330 | __cg_chown = (int (*)(const char *, uid_t, gid_t))dlsym(dlopen_handle, "cg_chown"); | |
237e200e | 331 | error = dlerror(); |
971aa868 CB |
332 | if (error) |
333 | return log_error(-1, "%s - Failed to find cg_chown()", error); | |
0b6af11b | 334 | |
9ce186dc | 335 | return __cg_chown(path, uid, gid); |
41bb9357 SH |
336 | } |
337 | ||
237e200e | 338 | static int do_cg_rmdir(const char *path) |
23ce2127 | 339 | { |
237e200e | 340 | char *error; |
971aa868 | 341 | int (*__cg_rmdir)(const char *path); |
9ce186dc | 342 | |
971aa868 CB |
343 | dlerror(); |
344 | __cg_rmdir = (int (*)(const char *path))dlsym(dlopen_handle, "cg_rmdir"); | |
237e200e | 345 | error = dlerror(); |
971aa868 CB |
346 | if (error) |
347 | return log_error(-1, "%s - Failed to find cg_rmdir()", error); | |
97f1f27b | 348 | |
9ce186dc | 349 | return __cg_rmdir(path); |
237e200e | 350 | } |
f6c0b279 | 351 | |
237e200e SH |
352 | static int do_cg_chmod(const char *path, mode_t mode) |
353 | { | |
237e200e | 354 | char *error; |
971aa868 | 355 | int (*__cg_chmod)(const char *path, mode_t mode); |
9ce186dc | 356 | |
971aa868 CB |
357 | dlerror(); |
358 | __cg_chmod = (int (*)(const char *, mode_t))dlsym(dlopen_handle, "cg_chmod"); | |
237e200e | 359 | error = dlerror(); |
971aa868 CB |
360 | if (error) |
361 | return log_error(-1, "%s - Failed to find cg_chmod()", error); | |
cdcdb29b | 362 | |
9ce186dc | 363 | return __cg_chmod(path, mode); |
23ce2127 SH |
364 | } |
365 | ||
9ce186dc CB |
366 | static int do_cg_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
367 | off_t offset, struct fuse_file_info *fi) | |
49878439 | 368 | { |
971aa868 | 369 | char *error; |
9ce186dc CB |
370 | int (*__cg_readdir)(const char *path, void *buf, fuse_fill_dir_t filler, |
371 | off_t offset, struct fuse_file_info *fi); | |
49878439 | 372 | |
971aa868 CB |
373 | dlerror(); |
374 | __cg_readdir = (int (*)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "cg_readdir"); | |
237e200e | 375 | error = dlerror(); |
971aa868 CB |
376 | if (error) |
377 | return log_error(-1, "%s - Failed to find cg_readdir()", error); | |
49878439 | 378 | |
9ce186dc | 379 | return __cg_readdir(path, buf, filler, offset, fi); |
237e200e | 380 | } |
49878439 | 381 | |
9ce186dc CB |
382 | static int do_proc_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
383 | off_t offset, struct fuse_file_info *fi) | |
237e200e | 384 | { |
971aa868 | 385 | char *error; |
9ce186dc CB |
386 | int (*__proc_readdir)(const char *path, void *buf, fuse_fill_dir_t filler, |
387 | off_t offset, struct fuse_file_info *fi); | |
49878439 | 388 | |
971aa868 CB |
389 | dlerror(); |
390 | __proc_readdir = (int (*)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "proc_readdir"); | |
237e200e | 391 | error = dlerror(); |
971aa868 CB |
392 | if (error) |
393 | return log_error(-1, "%s - Failed to find proc_readdir()", error); | |
49878439 | 394 | |
9ce186dc | 395 | return __proc_readdir(path, buf, filler, offset, fi); |
49878439 YY |
396 | } |
397 | ||
9ce186dc CB |
398 | static int do_sys_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
399 | off_t offset, struct fuse_file_info *fi) | |
71f17cd2 | 400 | { |
71f17cd2 | 401 | char *error; |
971aa868 CB |
402 | int (*__sys_readdir)(const char *path, void *buf, fuse_fill_dir_t filler, |
403 | off_t offset, struct fuse_file_info *fi); | |
71f17cd2 | 404 | |
971aa868 CB |
405 | dlerror(); |
406 | __sys_readdir = (int (*)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "sys_readdir"); | |
71f17cd2 | 407 | error = dlerror(); |
971aa868 CB |
408 | if (error) |
409 | return log_error(-1, "%s - Failed to find sys_readdir()", error); | |
71f17cd2 | 410 | |
9ce186dc | 411 | return __sys_readdir(path, buf, filler, offset, fi); |
71f17cd2 YB |
412 | } |
413 | ||
26b717d0 ZL |
414 | static int do_sys_readlink(const char *path, char *buf, size_t size) |
415 | { | |
416 | char *error; | |
417 | int (*__sys_readlink)(const char *path, char *buf, size_t size); | |
418 | ||
419 | dlerror(); | |
420 | __sys_readlink = (int (*)(const char *, char *, size_t))dlsym(dlopen_handle, "sys_readlink"); | |
421 | error = dlerror(); | |
422 | if (error) | |
423 | return log_error(-1, "%s - Failed to find sys_readlink()", error); | |
424 | ||
425 | return __sys_readlink(path, buf, size); | |
426 | } | |
71f17cd2 | 427 | |
237e200e | 428 | static int do_cg_open(const char *path, struct fuse_file_info *fi) |
23ce2127 | 429 | { |
237e200e | 430 | char *error; |
971aa868 CB |
431 | int (*__cg_open)(const char *path, struct fuse_file_info *fi); |
432 | ||
433 | dlerror(); | |
434 | __cg_open = (int (*)(const char *, struct fuse_file_info *))dlsym(dlopen_handle, "cg_open"); | |
237e200e | 435 | error = dlerror(); |
971aa868 CB |
436 | if (error) |
437 | return log_error(-1, "%s - Failed to find cg_open()", error); | |
23ce2127 | 438 | |
9ce186dc | 439 | return __cg_open(path, fi); |
23ce2127 SH |
440 | } |
441 | ||
bddbb106 SH |
442 | static int do_cg_access(const char *path, int mode) |
443 | { | |
bddbb106 | 444 | char *error; |
971aa868 CB |
445 | int (*__cg_access)(const char *path, int mode); |
446 | ||
447 | dlerror(); | |
448 | __cg_access = (int (*)(const char *, int mode))dlsym(dlopen_handle, "cg_access"); | |
bddbb106 | 449 | error = dlerror(); |
971aa868 CB |
450 | if (error) |
451 | return log_error(-1, "%s - Failed to find cg_access()", error); | |
bddbb106 | 452 | |
9ce186dc | 453 | return __cg_access(path, mode); |
bddbb106 SH |
454 | } |
455 | ||
237e200e | 456 | static int do_proc_open(const char *path, struct fuse_file_info *fi) |
758ad80c | 457 | { |
237e200e | 458 | char *error; |
971aa868 CB |
459 | int (*__proc_open)(const char *path, struct fuse_file_info *fi); |
460 | ||
461 | dlerror(); | |
462 | __proc_open = (int (*)(const char *path, struct fuse_file_info *fi))dlsym(dlopen_handle, "proc_open"); | |
237e200e | 463 | error = dlerror(); |
971aa868 CB |
464 | if (error) |
465 | return log_error(-1, "%s - Failed to find proc_open()", error); | |
35629743 | 466 | |
9ce186dc | 467 | return __proc_open(path, fi); |
35629743 SH |
468 | } |
469 | ||
bddbb106 SH |
470 | static int do_proc_access(const char *path, int mode) |
471 | { | |
bddbb106 | 472 | char *error; |
971aa868 CB |
473 | int (*__proc_access)(const char *path, int mode); |
474 | ||
475 | dlerror(); | |
476 | __proc_access = (int (*)(const char *, int mode))dlsym(dlopen_handle, "proc_access"); | |
bddbb106 | 477 | error = dlerror(); |
971aa868 CB |
478 | if (error) |
479 | return log_error(-1, "%s - Failed to find proc_access()", error); | |
bddbb106 | 480 | |
9ce186dc | 481 | return __proc_access(path, mode); |
bddbb106 SH |
482 | } |
483 | ||
71f17cd2 YB |
484 | static int do_sys_open(const char *path, struct fuse_file_info *fi) |
485 | { | |
71f17cd2 | 486 | char *error; |
971aa868 CB |
487 | int (*__sys_open)(const char *path, struct fuse_file_info *fi); |
488 | ||
489 | dlerror(); | |
490 | __sys_open = (int (*)(const char *path, struct fuse_file_info *fi))dlsym(dlopen_handle, "sys_open"); | |
71f17cd2 | 491 | error = dlerror(); |
971aa868 CB |
492 | if (error) |
493 | return log_error(-1, "%s - Failed to find sys_open()", error); | |
71f17cd2 | 494 | |
9ce186dc | 495 | return __sys_open(path, fi); |
71f17cd2 YB |
496 | } |
497 | ||
26b717d0 ZL |
498 | static int do_sys_opendir(const char *path, struct fuse_file_info *fi) |
499 | { | |
500 | char *error; | |
501 | int (*__sys_opendir)(const char *path, struct fuse_file_info *fi); | |
502 | ||
503 | dlerror(); | |
504 | __sys_opendir = (int (*)(const char *path, struct fuse_file_info *fi))dlsym(dlopen_handle, "sys_opendir"); | |
505 | error = dlerror(); | |
506 | if (error) | |
507 | return log_error(-1, "%s - Failed to find sys_opendir()", error); | |
508 | ||
509 | return __sys_opendir(path, fi); | |
510 | } | |
511 | ||
71f17cd2 YB |
512 | static int do_sys_access(const char *path, int mode) |
513 | { | |
71f17cd2 | 514 | char *error; |
971aa868 CB |
515 | int (*__sys_access)(const char *path, int mode); |
516 | ||
517 | dlerror(); | |
518 | __sys_access = (int (*)(const char *, int mode))dlsym(dlopen_handle, "sys_access"); | |
71f17cd2 | 519 | error = dlerror(); |
971aa868 CB |
520 | if (error) |
521 | return log_error(-1, "%s - Failed to find sys_access()", error); | |
71f17cd2 | 522 | |
9ce186dc | 523 | return __sys_access(path, mode); |
71f17cd2 YB |
524 | } |
525 | ||
237e200e | 526 | static int do_cg_release(const char *path, struct fuse_file_info *fi) |
35629743 | 527 | { |
237e200e | 528 | char *error; |
971aa868 CB |
529 | int (*__cg_release)(const char *path, struct fuse_file_info *fi); |
530 | ||
531 | dlerror(); | |
532 | __cg_release = (int (*)(const char *path, struct fuse_file_info *))dlsym(dlopen_handle, "cg_release"); | |
237e200e | 533 | error = dlerror(); |
971aa868 CB |
534 | if (error) |
535 | return log_error(-1, "%s - Failed to find cg_release()", error); | |
237e200e | 536 | |
9ce186dc | 537 | return __cg_release(path, fi); |
758ad80c SH |
538 | } |
539 | ||
237e200e | 540 | static int do_proc_release(const char *path, struct fuse_file_info *fi) |
35629743 | 541 | { |
237e200e | 542 | char *error; |
971aa868 CB |
543 | int (*__proc_release)(const char *path, struct fuse_file_info *fi); |
544 | ||
545 | dlerror(); | |
9ce186dc | 546 | __proc_release = (int (*)(const char *path, struct fuse_file_info *)) dlsym(dlopen_handle, "proc_release"); |
237e200e | 547 | error = dlerror(); |
971aa868 CB |
548 | if (error) |
549 | return log_error(-1, "%s - Failed to find proc_release()", error); | |
97f1f27b | 550 | |
9ce186dc | 551 | return __proc_release(path, fi); |
96fc5ee6 SH |
552 | } |
553 | ||
71f17cd2 YB |
554 | static int do_sys_release(const char *path, struct fuse_file_info *fi) |
555 | { | |
71f17cd2 | 556 | char *error; |
971aa868 CB |
557 | int (*__sys_release)(const char *path, struct fuse_file_info *fi); |
558 | ||
559 | dlerror(); | |
560 | __sys_release = (int (*)(const char *path, struct fuse_file_info *))dlsym(dlopen_handle, "sys_release"); | |
71f17cd2 | 561 | error = dlerror(); |
971aa868 CB |
562 | if (error) |
563 | return log_error(-1, "%s - Failed to find sys_release()", error); | |
71f17cd2 | 564 | |
9ce186dc | 565 | return __sys_release(path, fi); |
71f17cd2 YB |
566 | } |
567 | ||
237e200e | 568 | static int do_cg_opendir(const char *path, struct fuse_file_info *fi) |
96fc5ee6 | 569 | { |
237e200e | 570 | char *error; |
971aa868 CB |
571 | int (*__cg_opendir)(const char *path, struct fuse_file_info *fi); |
572 | ||
573 | dlerror(); | |
574 | __cg_opendir = (int (*)(const char *path, struct fuse_file_info *fi))dlsym(dlopen_handle, "cg_opendir"); | |
237e200e | 575 | error = dlerror(); |
971aa868 CB |
576 | if (error) |
577 | return log_error(-1, "%s - Failed to find cg_opendir()", error); | |
96fc5ee6 | 578 | |
9ce186dc | 579 | return __cg_opendir(path, fi); |
35629743 SH |
580 | } |
581 | ||
237e200e | 582 | static int do_cg_releasedir(const char *path, struct fuse_file_info *fi) |
35629743 | 583 | { |
237e200e | 584 | char *error; |
971aa868 CB |
585 | int (*__cg_releasedir)(const char *path, struct fuse_file_info *fi); |
586 | ||
587 | dlerror(); | |
588 | __cg_releasedir = (int (*)(const char *path, struct fuse_file_info *))dlsym(dlopen_handle, "cg_releasedir"); | |
237e200e | 589 | error = dlerror(); |
971aa868 CB |
590 | if (error) |
591 | return log_error(-1, "%s - Failed to find cg_releasedir()", error); | |
237e200e | 592 | |
9ce186dc | 593 | return __cg_releasedir(path, fi); |
35629743 SH |
594 | } |
595 | ||
71f17cd2 YB |
596 | static int do_sys_releasedir(const char *path, struct fuse_file_info *fi) |
597 | { | |
71f17cd2 | 598 | char *error; |
971aa868 CB |
599 | int (*__sys_releasedir)(const char *path, struct fuse_file_info *fi); |
600 | ||
601 | dlerror(); | |
602 | __sys_releasedir = (int (*)(const char *path, struct fuse_file_info *))dlsym(dlopen_handle, "sys_releasedir"); | |
71f17cd2 | 603 | error = dlerror(); |
971aa868 CB |
604 | if (error) |
605 | return log_error(-1, "%s - Failed to find sys_releasedir()", error); | |
71f17cd2 | 606 | |
9ce186dc | 607 | return __sys_releasedir(path, fi); |
71f17cd2 YB |
608 | } |
609 | ||
f834b6bf SP |
610 | #ifdef HAVE_FUSE3 |
611 | static int lxcfs_getattr(const char *path, struct stat *sb, struct fuse_file_info *fi) | |
612 | #else | |
758ad80c | 613 | static int lxcfs_getattr(const char *path, struct stat *sb) |
f834b6bf | 614 | #endif |
758ad80c | 615 | { |
237e200e | 616 | int ret; |
17e6e1e2 CB |
617 | struct timespec now; |
618 | ||
758ad80c | 619 | if (strcmp(path, "/") == 0) { |
17e6e1e2 CB |
620 | if (clock_gettime(CLOCK_REALTIME, &now) < 0) |
621 | return -EINVAL; | |
622 | sb->st_uid = sb->st_gid = 0; | |
623 | sb->st_atim = sb->st_mtim = sb->st_ctim = now; | |
624 | sb->st_size = 0; | |
758ad80c SH |
625 | sb->st_mode = S_IFDIR | 00755; |
626 | sb->st_nlink = 2; | |
627 | return 0; | |
628 | } | |
17e6e1e2 | 629 | |
758ad80c | 630 | if (strncmp(path, "/cgroup", 7) == 0) { |
237e200e SH |
631 | up_users(); |
632 | ret = do_cg_getattr(path, sb); | |
633 | down_users(); | |
634 | return ret; | |
758ad80c | 635 | } |
971aa868 | 636 | |
35629743 | 637 | if (strncmp(path, "/proc", 5) == 0) { |
237e200e SH |
638 | up_users(); |
639 | ret = do_proc_getattr(path, sb); | |
640 | down_users(); | |
641 | return ret; | |
758ad80c | 642 | } |
971aa868 | 643 | |
71f17cd2 YB |
644 | if (strncmp(path, "/sys", 4) == 0) { |
645 | up_users(); | |
646 | ret = do_sys_getattr(path, sb); | |
647 | down_users(); | |
648 | return ret; | |
649 | } | |
971aa868 | 650 | |
f9b24a3e | 651 | return -ENOENT; |
758ad80c SH |
652 | } |
653 | ||
654 | static int lxcfs_opendir(const char *path, struct fuse_file_info *fi) | |
655 | { | |
237e200e | 656 | int ret; |
971aa868 | 657 | |
758ad80c SH |
658 | if (strcmp(path, "/") == 0) |
659 | return 0; | |
660 | ||
661 | if (strncmp(path, "/cgroup", 7) == 0) { | |
237e200e SH |
662 | up_users(); |
663 | ret = do_cg_opendir(path, fi); | |
664 | down_users(); | |
665 | return ret; | |
758ad80c | 666 | } |
971aa868 | 667 | |
35629743 SH |
668 | if (strcmp(path, "/proc") == 0) |
669 | return 0; | |
971aa868 | 670 | |
26b717d0 ZL |
671 | if (strncmp(path, "/sys", 4) == 0) { |
672 | up_users(); | |
673 | ret = do_sys_opendir(path, fi); | |
674 | down_users(); | |
675 | return ret; | |
676 | } | |
71f17cd2 | 677 | |
35629743 | 678 | return -ENOENT; |
758ad80c SH |
679 | } |
680 | ||
f834b6bf SP |
681 | #ifdef HAVE_FUSE3 |
682 | static int lxcfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, | |
683 | off_t offset, struct fuse_file_info *fi, enum fuse_readdir_flags flags) | |
684 | #else | |
971aa868 CB |
685 | static int lxcfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
686 | off_t offset, struct fuse_file_info *fi) | |
f834b6bf | 687 | #endif |
758ad80c | 688 | { |
237e200e | 689 | int ret; |
971aa868 | 690 | |
758ad80c | 691 | if (strcmp(path, "/") == 0) { |
f834b6bf SP |
692 | if (DIR_FILLER(filler, buf, ".", NULL, 0) != 0 || |
693 | DIR_FILLER(filler, buf, "..", NULL, 0) != 0 || | |
694 | DIR_FILLER(filler, buf, "proc", NULL, 0) != 0 || | |
695 | DIR_FILLER(filler, buf, "sys", NULL, 0) != 0 || | |
696 | DIR_FILLER(filler, buf, "cgroup", NULL, 0) != 0) | |
f9b24a3e | 697 | return -ENOMEM; |
971aa868 | 698 | |
758ad80c SH |
699 | return 0; |
700 | } | |
971aa868 | 701 | |
237e200e SH |
702 | if (strncmp(path, "/cgroup", 7) == 0) { |
703 | up_users(); | |
704 | ret = do_cg_readdir(path, buf, filler, offset, fi); | |
705 | down_users(); | |
706 | return ret; | |
707 | } | |
971aa868 | 708 | |
237e200e SH |
709 | if (strcmp(path, "/proc") == 0) { |
710 | up_users(); | |
711 | ret = do_proc_readdir(path, buf, filler, offset, fi); | |
712 | down_users(); | |
713 | return ret; | |
714 | } | |
71f17cd2 YB |
715 | |
716 | if (strncmp(path, "/sys", 4) == 0) { | |
717 | up_users(); | |
718 | ret = do_sys_readdir(path, buf, filler, offset, fi); | |
719 | down_users(); | |
720 | return ret; | |
721 | } | |
722 | ||
f9b24a3e | 723 | return -ENOENT; |
758ad80c SH |
724 | } |
725 | ||
bddbb106 SH |
726 | static int lxcfs_access(const char *path, int mode) |
727 | { | |
728 | int ret; | |
17e6e1e2 | 729 | |
f9b24a3e | 730 | if (strcmp(path, "/") == 0 && (mode & W_OK) == 0) |
17e6e1e2 CB |
731 | return 0; |
732 | ||
bddbb106 SH |
733 | if (strncmp(path, "/cgroup", 7) == 0) { |
734 | up_users(); | |
735 | ret = do_cg_access(path, mode); | |
736 | down_users(); | |
737 | return ret; | |
738 | } | |
971aa868 | 739 | |
bddbb106 SH |
740 | if (strncmp(path, "/proc", 5) == 0) { |
741 | up_users(); | |
742 | ret = do_proc_access(path, mode); | |
743 | down_users(); | |
744 | return ret; | |
745 | } | |
971aa868 | 746 | |
71f17cd2 YB |
747 | if (strncmp(path, "/sys", 4) == 0) { |
748 | up_users(); | |
749 | ret = do_sys_access(path, mode); | |
750 | down_users(); | |
751 | return ret; | |
752 | } | |
753 | ||
f9b24a3e | 754 | return -EACCES; |
bddbb106 SH |
755 | } |
756 | ||
758ad80c SH |
757 | static int lxcfs_releasedir(const char *path, struct fuse_file_info *fi) |
758 | { | |
237e200e | 759 | int ret; |
971aa868 | 760 | |
758ad80c SH |
761 | if (strcmp(path, "/") == 0) |
762 | return 0; | |
971aa868 | 763 | |
758ad80c | 764 | if (strncmp(path, "/cgroup", 7) == 0) { |
237e200e SH |
765 | up_users(); |
766 | ret = do_cg_releasedir(path, fi); | |
767 | down_users(); | |
768 | return ret; | |
758ad80c | 769 | } |
971aa868 | 770 | |
35629743 SH |
771 | if (strcmp(path, "/proc") == 0) |
772 | return 0; | |
971aa868 CB |
773 | |
774 | if (strncmp(path, "/sys", 4) == 0) { | |
71f17cd2 YB |
775 | up_users(); |
776 | ret = do_sys_releasedir(path, fi); | |
777 | down_users(); | |
778 | return ret; | |
779 | } | |
780 | ||
758ad80c SH |
781 | return -EINVAL; |
782 | } | |
783 | ||
99978832 SH |
784 | static int lxcfs_open(const char *path, struct fuse_file_info *fi) |
785 | { | |
237e200e | 786 | int ret; |
971aa868 | 787 | |
237e200e SH |
788 | if (strncmp(path, "/cgroup", 7) == 0) { |
789 | up_users(); | |
790 | ret = do_cg_open(path, fi); | |
791 | down_users(); | |
792 | return ret; | |
793 | } | |
971aa868 | 794 | |
237e200e SH |
795 | if (strncmp(path, "/proc", 5) == 0) { |
796 | up_users(); | |
797 | ret = do_proc_open(path, fi); | |
798 | down_users(); | |
799 | return ret; | |
800 | } | |
971aa868 | 801 | |
71f17cd2 YB |
802 | if (strncmp(path, "/sys", 4) == 0) { |
803 | up_users(); | |
804 | ret = do_sys_open(path, fi); | |
805 | down_users(); | |
806 | return ret; | |
807 | } | |
808 | ||
f9b24a3e | 809 | return -EACCES; |
99978832 SH |
810 | } |
811 | ||
812 | static int lxcfs_read(const char *path, char *buf, size_t size, off_t offset, | |
971aa868 | 813 | struct fuse_file_info *fi) |
99978832 | 814 | { |
237e200e | 815 | int ret; |
971aa868 | 816 | |
237e200e SH |
817 | if (strncmp(path, "/cgroup", 7) == 0) { |
818 | up_users(); | |
819 | ret = do_cg_read(path, buf, size, offset, fi); | |
820 | down_users(); | |
821 | return ret; | |
822 | } | |
971aa868 | 823 | |
237e200e SH |
824 | if (strncmp(path, "/proc", 5) == 0) { |
825 | up_users(); | |
826 | ret = do_proc_read(path, buf, size, offset, fi); | |
827 | down_users(); | |
828 | return ret; | |
829 | } | |
971aa868 | 830 | |
71f17cd2 YB |
831 | if (strncmp(path, "/sys", 4) == 0) { |
832 | up_users(); | |
833 | ret = do_sys_read(path, buf, size, offset, fi); | |
834 | down_users(); | |
835 | return ret; | |
836 | } | |
837 | ||
99978832 SH |
838 | return -EINVAL; |
839 | } | |
840 | ||
2ad6d2bd | 841 | int lxcfs_write(const char *path, const char *buf, size_t size, off_t offset, |
971aa868 | 842 | struct fuse_file_info *fi) |
2ad6d2bd | 843 | { |
237e200e | 844 | int ret; |
971aa868 | 845 | |
2ad6d2bd | 846 | if (strncmp(path, "/cgroup", 7) == 0) { |
237e200e SH |
847 | up_users(); |
848 | ret = do_cg_write(path, buf, size, offset, fi); | |
849 | down_users(); | |
850 | return ret; | |
2ad6d2bd SH |
851 | } |
852 | ||
26b717d0 ZL |
853 | if (strncmp(path, "/sys", 4) == 0) { |
854 | up_users(); | |
855 | ret = do_sys_write(path, buf, size, offset, fi); | |
856 | down_users(); | |
857 | return ret; | |
858 | } | |
859 | ||
860 | return -EINVAL; | |
861 | } | |
862 | ||
863 | int lxcfs_readlink(const char *path, char *buf, size_t size) | |
864 | { | |
865 | int ret; | |
866 | ||
867 | if (strncmp(path, "/sys", 4) == 0) { | |
868 | up_users(); | |
869 | ret = do_sys_readlink(path, buf, size); | |
870 | down_users(); | |
871 | return ret; | |
872 | } | |
873 | ||
2ad6d2bd SH |
874 | return -EINVAL; |
875 | } | |
876 | ||
99978832 SH |
877 | static int lxcfs_flush(const char *path, struct fuse_file_info *fi) |
878 | { | |
879 | return 0; | |
880 | } | |
881 | ||
882 | static int lxcfs_release(const char *path, struct fuse_file_info *fi) | |
758ad80c | 883 | { |
237e200e | 884 | int ret; |
971aa868 | 885 | |
237e200e SH |
886 | if (strncmp(path, "/cgroup", 7) == 0) { |
887 | up_users(); | |
888 | ret = do_cg_release(path, fi); | |
889 | down_users(); | |
890 | return ret; | |
891 | } | |
971aa868 | 892 | |
237e200e SH |
893 | if (strncmp(path, "/proc", 5) == 0) { |
894 | up_users(); | |
895 | ret = do_proc_release(path, fi); | |
896 | down_users(); | |
897 | return ret; | |
898 | } | |
971aa868 | 899 | |
71f17cd2 YB |
900 | if (strncmp(path, "/sys", 4) == 0) { |
901 | up_users(); | |
902 | ret = do_sys_release(path, fi); | |
903 | down_users(); | |
904 | return ret; | |
905 | } | |
906 | ||
8f6e8f5e | 907 | return -EINVAL; |
99978832 SH |
908 | } |
909 | ||
910 | static int lxcfs_fsync(const char *path, int datasync, struct fuse_file_info *fi) | |
911 | { | |
912 | return 0; | |
758ad80c SH |
913 | } |
914 | ||
ab54b798 SH |
915 | int lxcfs_mkdir(const char *path, mode_t mode) |
916 | { | |
237e200e | 917 | int ret; |
971aa868 | 918 | |
237e200e SH |
919 | if (strncmp(path, "/cgroup", 7) == 0) { |
920 | up_users(); | |
921 | ret = do_cg_mkdir(path, mode); | |
922 | down_users(); | |
923 | return ret; | |
924 | } | |
ab54b798 | 925 | |
f9b24a3e | 926 | return -EPERM; |
ab54b798 SH |
927 | } |
928 | ||
f834b6bf SP |
929 | #ifdef HAVE_FUSE3 |
930 | int lxcfs_chown(const char *path, uid_t uid, gid_t gid, struct fuse_file_info *fi) | |
931 | #else | |
341b21ad | 932 | int lxcfs_chown(const char *path, uid_t uid, gid_t gid) |
f834b6bf | 933 | #endif |
341b21ad | 934 | { |
237e200e | 935 | int ret; |
971aa868 | 936 | |
237e200e SH |
937 | if (strncmp(path, "/cgroup", 7) == 0) { |
938 | up_users(); | |
939 | ret = do_cg_chown(path, uid, gid); | |
940 | down_users(); | |
941 | return ret; | |
942 | } | |
341b21ad | 943 | |
f9b24a3e CB |
944 | if (strncmp(path, "/proc", 5) == 0) |
945 | return -EPERM; | |
946 | ||
1f5596dd | 947 | if (strncmp(path, "/sys", 4) == 0) |
71f17cd2 | 948 | return -EPERM; |
971aa868 | 949 | |
f9b24a3e | 950 | return -ENOENT; |
341b21ad SH |
951 | } |
952 | ||
2ad6d2bd SH |
953 | /* |
954 | * cat first does a truncate before doing ops->write. This doesn't | |
955 | * really make sense for cgroups. So just return 0 always but do | |
956 | * nothing. | |
957 | */ | |
f834b6bf SP |
958 | #ifdef HAVE_FUSE3 |
959 | int lxcfs_truncate(const char *path, off_t newsize, struct fuse_file_info *fi) | |
960 | #else | |
2ad6d2bd | 961 | int lxcfs_truncate(const char *path, off_t newsize) |
f834b6bf | 962 | #endif |
2ad6d2bd SH |
963 | { |
964 | if (strncmp(path, "/cgroup", 7) == 0) | |
965 | return 0; | |
971aa868 | 966 | |
26b717d0 ZL |
967 | if (strncmp(path, "/sys", 4) == 0) |
968 | return 0; | |
969 | ||
f9b24a3e | 970 | return -EPERM; |
2ad6d2bd SH |
971 | } |
972 | ||
50d8d5b5 SH |
973 | int lxcfs_rmdir(const char *path) |
974 | { | |
237e200e | 975 | int ret; |
971aa868 | 976 | |
237e200e SH |
977 | if (strncmp(path, "/cgroup", 7) == 0) { |
978 | up_users(); | |
979 | ret = do_cg_rmdir(path); | |
980 | down_users(); | |
981 | return ret; | |
982 | } | |
971aa868 | 983 | |
f9b24a3e | 984 | return -EPERM; |
50d8d5b5 SH |
985 | } |
986 | ||
f834b6bf SP |
987 | #ifdef HAVE_FUSE3 |
988 | int lxcfs_chmod(const char *path, mode_t mode, struct fuse_file_info *fi) | |
989 | #else | |
fd2e4e03 | 990 | int lxcfs_chmod(const char *path, mode_t mode) |
f834b6bf | 991 | #endif |
fd2e4e03 | 992 | { |
237e200e | 993 | int ret; |
971aa868 | 994 | |
237e200e SH |
995 | if (strncmp(path, "/cgroup", 7) == 0) { |
996 | up_users(); | |
997 | ret = do_cg_chmod(path, mode); | |
998 | down_users(); | |
999 | return ret; | |
1000 | } | |
f9b24a3e CB |
1001 | |
1002 | if (strncmp(path, "/proc", 5) == 0) | |
1003 | return -EPERM; | |
1004 | ||
71f17cd2 YB |
1005 | if (strncmp(path, "/sys", 4) == 0) |
1006 | return -EPERM; | |
1007 | ||
f9b24a3e | 1008 | return -ENOENT; |
fd2e4e03 SH |
1009 | } |
1010 | ||
0d5383b7 | 1011 | #ifdef HAVE_FUSE3 |
285aea40 | 1012 | static void *lxcfs_init(struct fuse_conn_info *conn, struct fuse_config *cfg) |
0d5383b7 CB |
1013 | #else |
1014 | static void *lxcfs_init(struct fuse_conn_info *conn) | |
1015 | #endif | |
285aea40 CB |
1016 | { |
1017 | char *error; | |
0d5383b7 | 1018 | void *(*__lxcfs_fuse_init)(struct fuse_conn_info * conn, void * cfg); |
285aea40 CB |
1019 | |
1020 | dlerror(); | |
0d5383b7 | 1021 | __lxcfs_fuse_init = (void *(*)(struct fuse_conn_info * conn, void * cfg))dlsym(dlopen_handle, "lxcfs_fuse_init"); |
285aea40 CB |
1022 | error = dlerror(); |
1023 | if (error) | |
1024 | return log_error(NULL, "%s - Failed to find lxcfs_fuse_init()", error); | |
1025 | ||
0d5383b7 | 1026 | return __lxcfs_fuse_init(conn, NULL); |
285aea40 CB |
1027 | } |
1028 | ||
758ad80c | 1029 | const struct fuse_operations lxcfs_ops = { |
971aa868 CB |
1030 | .access = lxcfs_access, |
1031 | .chmod = lxcfs_chmod, | |
1032 | .chown = lxcfs_chown, | |
1033 | .flush = lxcfs_flush, | |
1034 | .fsync = lxcfs_fsync, | |
1035 | .getattr = lxcfs_getattr, | |
285aea40 | 1036 | .init = lxcfs_init, |
971aa868 CB |
1037 | .mkdir = lxcfs_mkdir, |
1038 | .open = lxcfs_open, | |
1039 | .opendir = lxcfs_opendir, | |
1040 | .read = lxcfs_read, | |
1041 | .readdir = lxcfs_readdir, | |
1042 | .release = lxcfs_release, | |
1043 | .releasedir = lxcfs_releasedir, | |
1044 | .rmdir = lxcfs_rmdir, | |
1045 | .truncate = lxcfs_truncate, | |
1046 | .write = lxcfs_write, | |
26b717d0 | 1047 | .readlink = lxcfs_readlink, |
971aa868 CB |
1048 | |
1049 | .create = NULL, | |
1050 | .destroy = NULL, | |
f834b6bf | 1051 | #ifndef HAVE_FUSE3 |
971aa868 | 1052 | .fgetattr = NULL, |
f834b6bf | 1053 | #endif |
971aa868 | 1054 | .fsyncdir = NULL, |
f834b6bf | 1055 | #ifndef HAVE_FUSE3 |
971aa868 CB |
1056 | .ftruncate = NULL, |
1057 | .getdir = NULL, | |
f834b6bf | 1058 | #endif |
971aa868 | 1059 | .getxattr = NULL, |
971aa868 CB |
1060 | .link = NULL, |
1061 | .listxattr = NULL, | |
1062 | .mknod = NULL, | |
971aa868 CB |
1063 | .rename = NULL, |
1064 | .removexattr = NULL, | |
1065 | .setxattr = NULL, | |
1066 | .statfs = NULL, | |
1067 | .symlink = NULL, | |
1068 | .unlink = NULL, | |
f834b6bf | 1069 | #ifndef HAVE_FUSE3 |
971aa868 | 1070 | .utime = NULL, |
f834b6bf | 1071 | #endif |
758ad80c SH |
1072 | }; |
1073 | ||
9b96e96e | 1074 | static void usage(void) |
758ad80c | 1075 | { |
a47192da | 1076 | lxcfs_info("Usage: lxcfs <directory>\n"); |
077d9d2f | 1077 | lxcfs_info("lxcfs is a FUSE-based proc, sys and cgroup virtualizing filesystem\n"); |
a47192da | 1078 | lxcfs_info("Options :"); |
b40c8afe | 1079 | lxcfs_info(" -d, --debug Run lxcfs with debugging enabled"); |
b40c8afe CB |
1080 | lxcfs_info(" -f, --foreground Run lxcfs in the foreground"); |
1081 | lxcfs_info(" -n, --help Print help"); | |
1082 | lxcfs_info(" -l, --enable-loadavg Enable loadavg virtualization"); | |
1083 | lxcfs_info(" -o Options to pass directly through fuse"); | |
1084 | lxcfs_info(" -p, --pidfile=FILE Path to use for storing lxcfs pid"); | |
1085 | lxcfs_info(" Default pidfile is %s/lxcfs.pid", RUNTIME_PATH); | |
1086 | lxcfs_info(" -u, --disable-swap Disable swap virtualization"); | |
1087 | lxcfs_info(" -v, --version Print lxcfs version"); | |
23ffaadd | 1088 | lxcfs_info(" --enable-cfs Enable CPU virtualization via CPU shares"); |
b40c8afe | 1089 | lxcfs_info(" --enable-pidfd Use pidfd for process tracking"); |
b0073134 | 1090 | exit(EXIT_FAILURE); |
758ad80c SH |
1091 | } |
1092 | ||
e190ee91 SH |
1093 | static int set_pidfile(char *pidfile) |
1094 | { | |
05b7a16d | 1095 | __do_close int fd = -EBADF; |
971aa868 CB |
1096 | char buf[INTTYPE_TO_STRLEN(long)]; |
1097 | int ret; | |
1098 | struct flock fl = { | |
b4bc238c CB |
1099 | .l_type = F_WRLCK, |
1100 | .l_whence = SEEK_SET, | |
1101 | .l_start = 0, | |
1102 | .l_len = 0, | |
971aa868 | 1103 | }; |
e190ee91 | 1104 | |
3326c17e | 1105 | fd = open(pidfile, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | O_CLOEXEC); |
971aa868 CB |
1106 | if (fd < 0) |
1107 | return log_error(-1, "Could not open pidfile %s: %m", pidfile); | |
e190ee91 | 1108 | |
971aa868 | 1109 | if (fcntl(fd, F_SETLK, &fl) < 0) { |
12a60884 | 1110 | if (errno == EAGAIN || errno == EACCES) |
971aa868 CB |
1111 | return log_error(-1, "PID file '%s' is already locked", pidfile); |
1112 | lxcfs_error("Warning; unable to lock PID file, proceeding"); | |
e190ee91 SH |
1113 | } |
1114 | ||
12a60884 | 1115 | if (ftruncate(fd, 0)) |
971aa868 CB |
1116 | return log_error(-1, "Error truncating PID file '%s': %m", pidfile); |
1117 | ||
1118 | ret = snprintf(buf, sizeof(buf), "%ld\n", (long)getpid()); | |
3cf1e562 | 1119 | if (ret < 0 || (size_t)ret >= sizeof(buf)) |
971aa868 | 1120 | return log_error(-1, "Failed to convert pid to string %m"); |
e190ee91 | 1121 | |
971aa868 CB |
1122 | if (write(fd, buf, ret) != ret) |
1123 | return log_error(-1, "Error writing to PID file '%s': %m", pidfile); | |
e190ee91 | 1124 | |
12a60884 | 1125 | return move_fd(fd); |
e190ee91 SH |
1126 | } |
1127 | ||
64a7d94d | 1128 | static const struct option long_options[] = { |
1129 | {"debug", no_argument, 0, 'd' }, | |
1130 | {"disable-swap", no_argument, 0, 'u' }, | |
1131 | {"enable-loadavg", no_argument, 0, 'l' }, | |
1132 | {"foreground", no_argument, 0, 'f' }, | |
1133 | {"help", no_argument, 0, 'h' }, | |
1134 | {"version", no_argument, 0, 'v' }, | |
1135 | ||
1136 | {"enable-cfs", no_argument, 0, 0 }, | |
1137 | {"enable-pidfd", no_argument, 0, 0 }, | |
1138 | ||
1139 | {"pidfile", required_argument, 0, 'p' }, | |
1140 | { }, | |
1141 | }; | |
1142 | ||
1143 | static int append_comma_separate(char **s, const char *append) | |
1144 | { | |
1145 | int ret; | |
1146 | char *news; | |
1147 | size_t append_len, len; | |
1148 | ||
1149 | if (!append) | |
1150 | return 0; | |
1151 | ||
1152 | append_len = strlen(append); | |
1153 | if (!append_len) | |
1154 | return 0; | |
1155 | ||
1156 | if (*s) { | |
1157 | len = strlen(*s); | |
1158 | news = realloc(*s, len + append_len + 2); | |
1159 | } else { | |
1160 | len = 0; | |
1161 | news = realloc(NULL, append_len + 1); | |
1162 | } | |
1163 | if (!news) | |
1164 | return -ENOMEM; | |
1165 | ||
1166 | if (*s) | |
1167 | ret = snprintf(news + len, append_len + 2, ",%s", append); | |
1168 | else | |
1169 | ret = snprintf(news, append_len + 1, "%s", append); | |
1170 | if (ret < 0) | |
1171 | return -EIO; | |
1172 | ||
1173 | *s = news; | |
1174 | return 0; | |
1175 | } | |
1176 | ||
758ad80c SH |
1177 | int main(int argc, char *argv[]) |
1178 | { | |
05b7a16d | 1179 | int pidfile_fd = -EBADF; |
47f5266f | 1180 | int ret = EXIT_FAILURE; |
64a7d94d | 1181 | char *pidfile = NULL, *token = NULL; |
bae92d21 | 1182 | char pidfile_buf[STRLITERALLEN(RUNTIME_PATH) + STRLITERALLEN("/lxcfs.pid") + 1] = {}; |
51c38c8b SP |
1183 | bool debug = false, foreground = false; |
1184 | #ifndef HAVE_FUSE3 | |
1185 | bool nonempty = false; | |
1186 | #endif | |
6db4f7a3 | 1187 | bool load_use = false; |
0b0f73db SH |
1188 | /* |
1189 | * what we pass to fuse_main is: | |
1de81503 | 1190 | * argv[0] -s [-f|-d] -o allow_other,directio argv[1] NULL |
0b0f73db | 1191 | */ |
64a7d94d | 1192 | int fuse_argc = 0; |
1193 | int c, idx, new_argc; | |
1194 | char *fuse_argv[7]; | |
1195 | const char *fuse_opts = NULL; | |
1196 | char *new_fuse_opts = NULL; | |
1197 | char *const *new_argv; | |
7e60aa1b | 1198 | struct lxcfs_opts *opts; |
4ec5c9da | 1199 | |
7e60aa1b | 1200 | opts = malloc(sizeof(struct lxcfs_opts)); |
1201 | if (opts == NULL) { | |
971aa868 | 1202 | lxcfs_error("Error allocating memory for options"); |
7e60aa1b | 1203 | goto out; |
1204 | } | |
64a7d94d | 1205 | |
7e60aa1b | 1206 | opts->swap_off = false; |
2aa59b2e | 1207 | opts->use_pidfd = false; |
3b24c6c4 | 1208 | opts->use_cfs = false; |
285aea40 | 1209 | opts->version = 1; |
7e60aa1b | 1210 | |
64a7d94d | 1211 | while ((c = getopt_long(argc, argv, "dulfhvso:p:", long_options, &idx)) != -1) { |
1212 | switch (c) { | |
1213 | case 0: | |
1214 | if (strcmp(long_options[idx].name, "enable-pidfd") == 0) | |
1215 | opts->use_pidfd = true; | |
1216 | else if (strcmp(long_options[idx].name, "enable-cfs") == 0) | |
1217 | opts->use_cfs = true; | |
1218 | else | |
1219 | usage(); | |
1220 | break; | |
1221 | case 'd': | |
1222 | debug = true; | |
1223 | break; | |
1224 | case 'f': | |
1225 | foreground = true; | |
1226 | break; | |
1227 | case 'l': | |
1228 | load_use = true; | |
1229 | break; | |
1230 | case 'o': | |
1231 | if (fuse_opts) { | |
1232 | lxcfs_error("Specifying -o multiple times is unsupported"); | |
1233 | usage(); | |
1234 | } | |
b0073134 | 1235 | |
64a7d94d | 1236 | fuse_opts = optarg; |
1237 | break; | |
1238 | case 'p': | |
1239 | pidfile = optarg; | |
1240 | break; | |
1241 | case 's': | |
1242 | /* legacy argument: ignore */ | |
1243 | break; | |
1244 | case 'u': | |
1245 | opts->swap_off = true; | |
1246 | break; | |
10deeaaf | 1247 | case 'v': |
1248 | case 'version': | |
1249 | lxcfs_info("%s", STRINGIFY(PROJECT_VERSION)); | |
1250 | exit(EXIT_SUCCESS); | |
64a7d94d | 1251 | default: |
1252 | usage(); | |
1253 | } | |
1254 | } | |
b0073134 CB |
1255 | |
1256 | if (foreground && debug) | |
1257 | log_exit("Both --debug and --forgreound specified"); | |
1258 | ||
64a7d94d | 1259 | new_argv = &argv[optind]; |
1260 | new_argc = argc - optind; | |
10deeaaf | 1261 | if (new_argc == 0) { |
1262 | usage(); | |
1263 | } | |
64a7d94d | 1264 | if (new_argc != 1) { |
1265 | lxcfs_error("Missing mountpoint"); | |
1266 | goto out; | |
1267 | } | |
1268 | ||
1269 | fuse_argv[fuse_argc++] = argv[0]; | |
1270 | if (debug) | |
1271 | fuse_argv[fuse_argc++] = "-d"; | |
1272 | else | |
1273 | fuse_argv[fuse_argc++] = "-f"; | |
1274 | fuse_argv[fuse_argc++] = "-o"; | |
1275 | ||
1276 | /* Parse additional fuse options. */ | |
1277 | if (fuse_opts) { | |
1278 | char *dup; | |
1279 | ||
1280 | dup = strdup(fuse_opts); | |
1281 | if (!dup) { | |
1282 | lxcfs_error("Failed to copy fuse options"); | |
1283 | goto out; | |
1284 | } | |
1285 | ||
1286 | lxc_iterate_parts(token, dup, ",") { | |
1287 | /* default */ | |
1288 | if (strcmp(token, "allow_other") == 0) | |
1289 | continue; | |
1290 | ||
1291 | /* default for LXCFS */ | |
1292 | if (strcmp(token, "direct_io") == 0) | |
1293 | continue; | |
1294 | ||
1295 | /* default for LXCFS */ | |
1296 | if (strncmp(token, "entry_timeout", STRLITERALLEN("entry_timeout")) == 0) | |
1297 | continue; | |
1298 | ||
1299 | /* default for LXCFS */ | |
1300 | if (strncmp(token, "attr_timeout", STRLITERALLEN("entry_timeout")) == 0) | |
1301 | continue; | |
1302 | ||
1303 | /* default for LXCFS */ | |
1304 | if (strncmp(token, "allow_other", STRLITERALLEN("allow_other")) == 0) | |
1305 | continue; | |
1306 | ||
1307 | /* default with fuse3 */ | |
1308 | if (strcmp(token, "nonempty") == 0) { | |
1309 | #ifndef HAVE_FUSE3 | |
482a80d4 | 1310 | nonempty = true; |
64a7d94d | 1311 | #endif |
1312 | continue; | |
1313 | } | |
1314 | ||
1315 | if (append_comma_separate(&new_fuse_opts, token)) { | |
1316 | lxcfs_error("Failed to copy fuse argument \"%s\"", token); | |
1317 | free(dup); | |
1318 | goto out; | |
482a80d4 | 1319 | } |
e190ee91 | 1320 | } |
64a7d94d | 1321 | free(dup); |
e190ee91 | 1322 | } |
b0073134 | 1323 | |
64a7d94d | 1324 | if (append_comma_separate(&new_fuse_opts, "allow_other,entry_timeout=0.5,attr_timeout=0.5")) { |
1325 | lxcfs_error("Failed to copy fuse argument \"allow_other,entry_timeout=0.5,attr_timeout=0.5\""); | |
1326 | goto out; | |
2e9c0b32 | 1327 | } |
23b42f47 | 1328 | |
64a7d94d | 1329 | #ifndef HAVE_FUSE3 |
1330 | if (nonempty) { | |
1331 | if (append_comma_separate(&new_fuse_opts, "nonempty")) { | |
1332 | lxcfs_error("Failed to copy fuse argument \"nonempty\""); | |
1333 | goto out; | |
1334 | } | |
1335 | } | |
758ad80c | 1336 | |
64a7d94d | 1337 | if (append_comma_separate(&new_fuse_opts, "direct_io")) { |
1338 | lxcfs_error("Failed to copy fuse argument \"nonempty\""); | |
47f5266f | 1339 | goto out; |
8fad16cd | 1340 | } |
64a7d94d | 1341 | #endif |
8a03c08b CB |
1342 | |
1343 | /* | |
1344 | * We can't use default_permissions since we still support systems that | |
1345 | * don't have kernels with cgroup namespace support. On such kernels | |
1346 | * lxcfs will provide a namespaced cgroup view and needs explicit | |
1347 | * access helpers to make that work. | |
1348 | * Another reason that came to me is that we can't or at least | |
1349 | * shouldn't guarantee that we don't need more complicated access | |
1350 | * helpers for proc and sys virtualization in the future. | |
1351 | */ | |
64a7d94d | 1352 | |
1353 | fuse_argv[fuse_argc++] = new_fuse_opts; | |
1354 | fuse_argv[fuse_argc++] = new_argv[0]; | |
1355 | fuse_argv[fuse_argc] = NULL; | |
1356 | ||
64a7d94d | 1357 | do_reload(); |
1358 | if (install_signal_handler(SIGUSR1, sigusr1_reload)) { | |
1359 | lxcfs_error("%s - Failed to install SIGUSR1 signal handler", strerror(errno)); | |
1360 | goto out; | |
1361 | } | |
758ad80c | 1362 | |
e190ee91 | 1363 | if (!pidfile) { |
bae92d21 CB |
1364 | snprintf(pidfile_buf, sizeof(pidfile_buf), "%s/lxcfs.pid", RUNTIME_PATH); |
1365 | pidfile = pidfile_buf; | |
e190ee91 | 1366 | } |
ed5ee4f9 CB |
1367 | |
1368 | pidfile_fd = set_pidfile(pidfile); | |
1369 | if (pidfile_fd < 0) | |
e190ee91 SH |
1370 | goto out; |
1371 | ||
a83618e2 JS |
1372 | if (load_use && start_loadavg() != 0) |
1373 | goto out; | |
6db4f7a3 | 1374 | |
64a7d94d | 1375 | if (!fuse_main(fuse_argc, fuse_argv, &lxcfs_ops, opts)) |
47f5266f | 1376 | ret = EXIT_SUCCESS; |
51c38c8b | 1377 | |
a83618e2 JS |
1378 | if (load_use) |
1379 | stop_loadavg(); | |
237e200e | 1380 | |
c0adec85 | 1381 | out: |
47f5266f CB |
1382 | if (dlopen_handle) |
1383 | dlclose(dlopen_handle); | |
1384 | if (pidfile) | |
1385 | unlink(pidfile); | |
64a7d94d | 1386 | free(new_fuse_opts); |
b58c203b | 1387 | free(opts); |
05b7a16d | 1388 | close_prot_errno_disarm(pidfile_fd); |
47f5266f | 1389 | exit(ret); |
2183082c | 1390 | } |