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Commit | Line | Data |
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db0463bf | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
758ad80c | 2 | |
f834b6bf SP |
3 | #include "config.h" |
4 | ||
4e3f18fb | 5 | #include <alloca.h> |
758ad80c | 6 | #include <dirent.h> |
1ece80b2 CB |
7 | #include <dlfcn.h> |
8 | #include <errno.h> | |
758ad80c | 9 | #include <fcntl.h> |
64a7d94d | 10 | #include <getopt.h> |
758ad80c | 11 | #include <libgen.h> |
b11c6ec0 | 12 | #include <pthread.h> |
1ece80b2 CB |
13 | #include <sched.h> |
14 | #include <stdbool.h> | |
15 | #include <stdio.h> | |
16 | #include <stdlib.h> | |
17 | #include <string.h> | |
18 | #include <time.h> | |
19 | #include <unistd.h> | |
20 | #include <wait.h> | |
41bb9357 | 21 | #include <linux/sched.h> |
5b2dfd85 | 22 | #include <sys/epoll.h> |
1ece80b2 CB |
23 | #include <sys/mount.h> |
24 | #include <sys/socket.h> | |
9dd49ba5 | 25 | #include <linux/limits.h> |
758ad80c | 26 | |
bb4e3c8f | 27 | #include "lxcfs_fuse.h" |
0a5da718 | 28 | |
237e200e | 29 | #include "bindings.h" |
ec2043ed | 30 | #include "lxcfs_fuse_compat.h" |
12a60884 CB |
31 | #include "macro.h" |
32 | #include "memory_utils.h" | |
758ad80c | 33 | |
237e200e | 34 | void *dlopen_handle; |
b11c6ec0 | 35 | |
237e200e | 36 | /* Functions to keep track of number of threads using the library */ |
6d1308cb | 37 | |
237e200e SH |
38 | static int users_count; |
39 | static pthread_mutex_t user_count_mutex = PTHREAD_MUTEX_INITIALIZER; | |
b11c6ec0 | 40 | static void lock_mutex(pthread_mutex_t *l) |
2c51f8dd | 41 | { |
b11c6ec0 | 42 | int ret; |
2c51f8dd | 43 | |
02aeab4b CB |
44 | ret = pthread_mutex_lock(l); |
45 | if (ret) | |
46 | log_exit("%s - returned: %d\n", strerror(ret), ret); | |
b11c6ec0 | 47 | } |
2c51f8dd | 48 | |
237e200e | 49 | static void unlock_mutex(pthread_mutex_t *l) |
23ce2127 | 50 | { |
237e200e | 51 | int ret; |
2dc17609 | 52 | |
02aeab4b CB |
53 | ret = pthread_mutex_unlock(l); |
54 | if (ret) | |
55 | log_exit("%s - returned: %d\n", strerror(ret), ret); | |
237e200e | 56 | } |
2dc17609 | 57 | |
02aeab4b | 58 | static inline void users_lock(void) |
237e200e SH |
59 | { |
60 | lock_mutex(&user_count_mutex); | |
61 | } | |
b731895e | 62 | |
02aeab4b | 63 | static inline void users_unlock(void) |
237e200e SH |
64 | { |
65 | unlock_mutex(&user_count_mutex); | |
66 | } | |
e1068397 | 67 | |
a83618e2 JS |
68 | static pthread_t loadavg_pid = 0; |
69 | ||
70 | /* Returns zero on success */ | |
971aa868 CB |
71 | static int start_loadavg(void) |
72 | { | |
a83618e2 | 73 | char *error; |
9ce186dc | 74 | pthread_t (*__load_daemon)(int); |
a83618e2 | 75 | |
971aa868 CB |
76 | dlerror(); |
77 | __load_daemon = (pthread_t(*)(int))dlsym(dlopen_handle, "load_daemon"); | |
a83618e2 | 78 | error = dlerror(); |
971aa868 CB |
79 | if (error) |
80 | return log_error(-1, "%s - Failed to start loadavg daemon", error); | |
81 | ||
9ce186dc | 82 | loadavg_pid = __load_daemon(1); |
971aa868 | 83 | if (!loadavg_pid) |
a83618e2 JS |
84 | return -1; |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | /* Returns zero on success */ | |
971aa868 CB |
90 | static int stop_loadavg(void) |
91 | { | |
a83618e2 | 92 | char *error; |
9ce186dc | 93 | int (*__stop_load_daemon)(pthread_t); |
a83618e2 | 94 | |
971aa868 | 95 | __stop_load_daemon = (int (*)(pthread_t))dlsym(dlopen_handle, "stop_load_daemon"); |
a83618e2 | 96 | error = dlerror(); |
971aa868 CB |
97 | if (error) |
98 | return log_error(-1, "%s - Failed to stop loadavg daemon", error); | |
a83618e2 | 99 | |
971aa868 | 100 | if (__stop_load_daemon(loadavg_pid)) |
a83618e2 JS |
101 | return -1; |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
81d17d8f | 106 | static volatile sig_atomic_t need_reload; |
59120f04 | 107 | |
237e200e SH |
108 | /* do_reload - reload the dynamic library. Done under |
109 | * lock and when we know the user_count was 0 */ | |
110 | static void do_reload(void) | |
111 | { | |
1b8fb279 | 112 | int ret; |
9dd49ba5 | 113 | char lxcfs_lib_path[PATH_MAX]; |
a83618e2 JS |
114 | |
115 | if (loadavg_pid > 0) | |
116 | stop_loadavg(); | |
117 | ||
b8defc3d | 118 | if (dlopen_handle) { |
0b5e6053 | 119 | lxcfs_info("Closed liblxcfs.so"); |
237e200e | 120 | dlclose(dlopen_handle); |
b8defc3d | 121 | } |
e1068397 | 122 | |
59120f04 | 123 | /* First try loading using ld.so */ |
c7894bc7 CB |
124 | #ifdef RESOLVE_NOW |
125 | dlopen_handle = dlopen("liblxcfs.so", RTLD_NOW); | |
126 | #else | |
237e200e | 127 | dlopen_handle = dlopen("liblxcfs.so", RTLD_LAZY); |
c7894bc7 | 128 | #endif |
b8defc3d | 129 | if (dlopen_handle) { |
0b5e6053 | 130 | lxcfs_debug("Opened liblxcfs.so"); |
59120f04 | 131 | goto good; |
b8defc3d | 132 | } |
59120f04 | 133 | |
9dd49ba5 DK |
134 | #ifdef LIBDIR |
135 | /* LIBDIR: autoconf will setup this MACRO. Default value is $PREFIX/lib */ | |
1b8fb279 | 136 | ret = snprintf(lxcfs_lib_path, sizeof(lxcfs_lib_path), "%s/lxcfs/liblxcfs.so", LIBDIR); |
9dd49ba5 | 137 | #else |
1b8fb279 | 138 | ret = snprintf(lxcfs_lib_path, sizeof(lxcfs_lib_path), "/usr/local/lib/lxcfs/liblxcfs.so"); |
9dd49ba5 | 139 | #endif |
3cf1e562 | 140 | if (ret < 0 || (size_t)ret >= sizeof(lxcfs_lib_path)) |
1b8fb279 CB |
141 | log_exit("Failed to create path to open liblxcfs"); |
142 | ||
9dd49ba5 | 143 | dlopen_handle = dlopen(lxcfs_lib_path, RTLD_LAZY); |
1b8fb279 CB |
144 | if (!dlopen_handle) |
145 | log_exit("%s - Failed to open liblxcfs.so", dlerror()); | |
146 | else | |
0b5e6053 | 147 | lxcfs_debug("Opened %s", lxcfs_lib_path); |
59120f04 SH |
148 | |
149 | good: | |
a83618e2 JS |
150 | if (loadavg_pid > 0) |
151 | start_loadavg(); | |
152 | ||
59120f04 | 153 | if (need_reload) |
0b5e6053 | 154 | lxcfs_info("Reloaded LXCFS"); |
237e200e | 155 | need_reload = 0; |
23ce2127 SH |
156 | } |
157 | ||
237e200e | 158 | static void up_users(void) |
23ce2127 | 159 | { |
237e200e SH |
160 | users_lock(); |
161 | if (users_count == 0 && need_reload) | |
162 | do_reload(); | |
163 | users_count++; | |
164 | users_unlock(); | |
165 | } | |
23ce2127 | 166 | |
237e200e SH |
167 | static void down_users(void) |
168 | { | |
169 | users_lock(); | |
170 | users_count--; | |
171 | users_unlock(); | |
23ce2127 SH |
172 | } |
173 | ||
dee86006 | 174 | static void sigusr1_reload(int signo, siginfo_t *info, void *extra) |
237e200e | 175 | { |
237e200e | 176 | need_reload = 1; |
237e200e | 177 | } |
23ce2127 | 178 | |
237e200e SH |
179 | /* Functions to run the library methods */ |
180 | static int do_cg_getattr(const char *path, struct stat *sb) | |
aeb56147 | 181 | { |
237e200e | 182 | char *error; |
971aa868 CB |
183 | int (*__cg_getattr)(const char *path, struct stat *sb); |
184 | ||
185 | dlerror(); | |
186 | __cg_getattr = (int (*)(const char *, struct stat *))dlsym(dlopen_handle, "cg_getattr"); | |
237e200e | 187 | error = dlerror(); |
971aa868 CB |
188 | if (error) |
189 | return log_error(-1, "%s - Failed to find cg_getattr()", error); | |
aeb56147 | 190 | |
9ce186dc | 191 | return __cg_getattr(path, sb); |
aeb56147 SH |
192 | } |
193 | ||
237e200e | 194 | static int do_proc_getattr(const char *path, struct stat *sb) |
23ce2127 | 195 | { |
237e200e | 196 | char *error; |
971aa868 CB |
197 | int (*__proc_getattr)(const char *path, struct stat *sb); |
198 | ||
199 | dlerror(); | |
9ce186dc | 200 | __proc_getattr = (int (*)(const char *, struct stat *)) dlsym(dlopen_handle, "proc_getattr"); |
237e200e | 201 | error = dlerror(); |
971aa868 CB |
202 | if (error) |
203 | return log_error(-1, "%s - Failed to find proc_getattr()", error); | |
23ce2127 | 204 | |
9ce186dc | 205 | return __proc_getattr(path, sb); |
23ce2127 SH |
206 | } |
207 | ||
71f17cd2 YB |
208 | static int do_sys_getattr(const char *path, struct stat *sb) |
209 | { | |
71f17cd2 | 210 | char *error; |
971aa868 CB |
211 | int (*__sys_getattr)(const char *path, struct stat *sb); |
212 | ||
213 | dlerror(); | |
9ce186dc | 214 | __sys_getattr = (int (*)(const char *, struct stat *)) dlsym(dlopen_handle, "sys_getattr"); |
71f17cd2 | 215 | error = dlerror(); |
971aa868 CB |
216 | if (error) |
217 | return log_error(-1, "%s - Failed to find sys_getattr()", error); | |
71f17cd2 | 218 | |
9ce186dc | 219 | return __sys_getattr(path, sb); |
71f17cd2 YB |
220 | } |
221 | ||
237e200e | 222 | static int do_cg_read(const char *path, char *buf, size_t size, off_t offset, |
971aa868 | 223 | struct fuse_file_info *fi) |
23ce2127 | 224 | { |
971aa868 | 225 | char *error; |
9ce186dc CB |
226 | int (*__cg_read)(const char *path, char *buf, size_t size, off_t offset, |
227 | struct fuse_file_info *fi); | |
23ce2127 | 228 | |
971aa868 CB |
229 | dlerror(); |
230 | __cg_read = (int (*)(const char *, char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "cg_read"); | |
237e200e | 231 | error = dlerror(); |
971aa868 CB |
232 | if (error) |
233 | return log_error(-1, "%s - Failed to find cg_read()", error); | |
23ce2127 | 234 | |
9ce186dc | 235 | return __cg_read(path, buf, size, offset, fi); |
23ce2127 SH |
236 | } |
237 | ||
237e200e | 238 | static int do_proc_read(const char *path, char *buf, size_t size, off_t offset, |
9ce186dc | 239 | struct fuse_file_info *fi) |
23ce2127 | 240 | { |
971aa868 | 241 | char *error; |
9ce186dc CB |
242 | int (*__proc_read)(const char *path, char *buf, size_t size, |
243 | off_t offset, struct fuse_file_info *fi); | |
aeb56147 | 244 | |
971aa868 CB |
245 | dlerror(); |
246 | __proc_read = (int (*)(const char *, char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "proc_read"); | |
237e200e | 247 | error = dlerror(); |
971aa868 CB |
248 | if (error) |
249 | return log_error(-1, "%s - Failed to find proc_read()", error); | |
97f1f27b | 250 | |
9ce186dc | 251 | return __proc_read(path, buf, size, offset, fi); |
237e200e | 252 | } |
97f1f27b | 253 | |
71f17cd2 | 254 | static int do_sys_read(const char *path, char *buf, size_t size, off_t offset, |
971aa868 | 255 | struct fuse_file_info *fi) |
71f17cd2 | 256 | { |
971aa868 | 257 | char *error; |
9ce186dc CB |
258 | int (*__sys_read)(const char *path, char *buf, size_t size, |
259 | off_t offset, struct fuse_file_info *fi); | |
71f17cd2 | 260 | |
971aa868 CB |
261 | dlerror(); |
262 | __sys_read = (int (*)(const char *, char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "sys_read"); | |
71f17cd2 | 263 | error = dlerror(); |
971aa868 CB |
264 | if (error) |
265 | return log_error(-1, "%s - Failed to find sys_read()", error); | |
71f17cd2 | 266 | |
9ce186dc | 267 | return __sys_read(path, buf, size, offset, fi); |
71f17cd2 YB |
268 | } |
269 | ||
971aa868 CB |
270 | static int do_cg_write(const char *path, const char *buf, size_t size, |
271 | off_t offset, struct fuse_file_info *fi) | |
237e200e | 272 | { |
971aa868 | 273 | char *error; |
9ce186dc CB |
274 | int (*__cg_write)(const char *path, const char *buf, size_t size, |
275 | off_t offset, struct fuse_file_info *fi); | |
971aa868 CB |
276 | |
277 | dlerror(); | |
278 | __cg_write = (int (*)(const char *, const char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "cg_write"); | |
237e200e | 279 | error = dlerror(); |
971aa868 CB |
280 | if (error) |
281 | return log_error(-1, "%s - Failed to find cg_write()", error); | |
97f1f27b | 282 | |
9ce186dc | 283 | return __cg_write(path, buf, size, offset, fi); |
23ce2127 SH |
284 | } |
285 | ||
26b717d0 ZL |
286 | static int do_sys_write(const char *path, const char *buf, size_t size, |
287 | off_t offset, struct fuse_file_info *fi) | |
288 | { | |
289 | char *error; | |
290 | int (*__sys_write)(const char *path, const char *buf, size_t size, | |
291 | off_t offset, struct fuse_file_info *fi); | |
292 | ||
293 | dlerror(); | |
294 | __sys_write = (int (*)(const char *, const char *, size_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "sys_write"); | |
295 | error = dlerror(); | |
296 | if (error) | |
297 | return log_error(-1, "%s - Failed to find sys_write()", error); | |
298 | ||
299 | return __sys_write(path, buf, size, offset, fi); | |
300 | } | |
301 | ||
237e200e | 302 | static int do_cg_mkdir(const char *path, mode_t mode) |
41bb9357 | 303 | { |
237e200e | 304 | char *error; |
971aa868 | 305 | int (*__cg_mkdir)(const char *path, mode_t mode); |
9ce186dc | 306 | |
971aa868 CB |
307 | dlerror(); |
308 | __cg_mkdir = (int (*)(const char *, mode_t))dlsym(dlopen_handle, "cg_mkdir"); | |
237e200e | 309 | error = dlerror(); |
971aa868 CB |
310 | if (error) |
311 | return log_error(-1, "%s - Failed to find cg_mkdir()", error); | |
41bb9357 | 312 | |
9ce186dc | 313 | return __cg_mkdir(path, mode); |
41bb9357 SH |
314 | } |
315 | ||
237e200e | 316 | static int do_cg_chown(const char *path, uid_t uid, gid_t gid) |
0b6af11b | 317 | { |
237e200e | 318 | char *error; |
971aa868 | 319 | int (*__cg_chown)(const char *path, uid_t uid, gid_t gid); |
9ce186dc | 320 | |
971aa868 CB |
321 | dlerror(); |
322 | __cg_chown = (int (*)(const char *, uid_t, gid_t))dlsym(dlopen_handle, "cg_chown"); | |
237e200e | 323 | error = dlerror(); |
971aa868 CB |
324 | if (error) |
325 | return log_error(-1, "%s - Failed to find cg_chown()", error); | |
0b6af11b | 326 | |
9ce186dc | 327 | return __cg_chown(path, uid, gid); |
41bb9357 SH |
328 | } |
329 | ||
237e200e | 330 | static int do_cg_rmdir(const char *path) |
23ce2127 | 331 | { |
237e200e | 332 | char *error; |
971aa868 | 333 | int (*__cg_rmdir)(const char *path); |
9ce186dc | 334 | |
971aa868 CB |
335 | dlerror(); |
336 | __cg_rmdir = (int (*)(const char *path))dlsym(dlopen_handle, "cg_rmdir"); | |
237e200e | 337 | error = dlerror(); |
971aa868 CB |
338 | if (error) |
339 | return log_error(-1, "%s - Failed to find cg_rmdir()", error); | |
97f1f27b | 340 | |
9ce186dc | 341 | return __cg_rmdir(path); |
237e200e | 342 | } |
f6c0b279 | 343 | |
237e200e SH |
344 | static int do_cg_chmod(const char *path, mode_t mode) |
345 | { | |
237e200e | 346 | char *error; |
971aa868 | 347 | int (*__cg_chmod)(const char *path, mode_t mode); |
9ce186dc | 348 | |
971aa868 CB |
349 | dlerror(); |
350 | __cg_chmod = (int (*)(const char *, mode_t))dlsym(dlopen_handle, "cg_chmod"); | |
237e200e | 351 | error = dlerror(); |
971aa868 CB |
352 | if (error) |
353 | return log_error(-1, "%s - Failed to find cg_chmod()", error); | |
cdcdb29b | 354 | |
9ce186dc | 355 | return __cg_chmod(path, mode); |
23ce2127 SH |
356 | } |
357 | ||
9ce186dc CB |
358 | static int do_cg_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
359 | off_t offset, struct fuse_file_info *fi) | |
49878439 | 360 | { |
971aa868 | 361 | char *error; |
9ce186dc CB |
362 | int (*__cg_readdir)(const char *path, void *buf, fuse_fill_dir_t filler, |
363 | off_t offset, struct fuse_file_info *fi); | |
49878439 | 364 | |
971aa868 CB |
365 | dlerror(); |
366 | __cg_readdir = (int (*)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "cg_readdir"); | |
237e200e | 367 | error = dlerror(); |
971aa868 CB |
368 | if (error) |
369 | return log_error(-1, "%s - Failed to find cg_readdir()", error); | |
49878439 | 370 | |
9ce186dc | 371 | return __cg_readdir(path, buf, filler, offset, fi); |
237e200e | 372 | } |
49878439 | 373 | |
9ce186dc CB |
374 | static int do_proc_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
375 | off_t offset, struct fuse_file_info *fi) | |
237e200e | 376 | { |
971aa868 | 377 | char *error; |
9ce186dc CB |
378 | int (*__proc_readdir)(const char *path, void *buf, fuse_fill_dir_t filler, |
379 | off_t offset, struct fuse_file_info *fi); | |
49878439 | 380 | |
971aa868 CB |
381 | dlerror(); |
382 | __proc_readdir = (int (*)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "proc_readdir"); | |
237e200e | 383 | error = dlerror(); |
971aa868 CB |
384 | if (error) |
385 | return log_error(-1, "%s - Failed to find proc_readdir()", error); | |
49878439 | 386 | |
9ce186dc | 387 | return __proc_readdir(path, buf, filler, offset, fi); |
49878439 YY |
388 | } |
389 | ||
9ce186dc CB |
390 | static int do_sys_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
391 | off_t offset, struct fuse_file_info *fi) | |
71f17cd2 | 392 | { |
71f17cd2 | 393 | char *error; |
971aa868 CB |
394 | int (*__sys_readdir)(const char *path, void *buf, fuse_fill_dir_t filler, |
395 | off_t offset, struct fuse_file_info *fi); | |
71f17cd2 | 396 | |
971aa868 CB |
397 | dlerror(); |
398 | __sys_readdir = (int (*)(const char *, void *, fuse_fill_dir_t, off_t, struct fuse_file_info *))dlsym(dlopen_handle, "sys_readdir"); | |
71f17cd2 | 399 | error = dlerror(); |
971aa868 CB |
400 | if (error) |
401 | return log_error(-1, "%s - Failed to find sys_readdir()", error); | |
71f17cd2 | 402 | |
9ce186dc | 403 | return __sys_readdir(path, buf, filler, offset, fi); |
71f17cd2 YB |
404 | } |
405 | ||
26b717d0 ZL |
406 | static int do_sys_readlink(const char *path, char *buf, size_t size) |
407 | { | |
408 | char *error; | |
409 | int (*__sys_readlink)(const char *path, char *buf, size_t size); | |
410 | ||
411 | dlerror(); | |
412 | __sys_readlink = (int (*)(const char *, char *, size_t))dlsym(dlopen_handle, "sys_readlink"); | |
413 | error = dlerror(); | |
414 | if (error) | |
415 | return log_error(-1, "%s - Failed to find sys_readlink()", error); | |
416 | ||
417 | return __sys_readlink(path, buf, size); | |
418 | } | |
71f17cd2 | 419 | |
237e200e | 420 | static int do_cg_open(const char *path, struct fuse_file_info *fi) |
23ce2127 | 421 | { |
237e200e | 422 | char *error; |
971aa868 CB |
423 | int (*__cg_open)(const char *path, struct fuse_file_info *fi); |
424 | ||
425 | dlerror(); | |
426 | __cg_open = (int (*)(const char *, struct fuse_file_info *))dlsym(dlopen_handle, "cg_open"); | |
237e200e | 427 | error = dlerror(); |
971aa868 CB |
428 | if (error) |
429 | return log_error(-1, "%s - Failed to find cg_open()", error); | |
23ce2127 | 430 | |
9ce186dc | 431 | return __cg_open(path, fi); |
23ce2127 SH |
432 | } |
433 | ||
bddbb106 SH |
434 | static int do_cg_access(const char *path, int mode) |
435 | { | |
bddbb106 | 436 | char *error; |
971aa868 CB |
437 | int (*__cg_access)(const char *path, int mode); |
438 | ||
439 | dlerror(); | |
440 | __cg_access = (int (*)(const char *, int mode))dlsym(dlopen_handle, "cg_access"); | |
bddbb106 | 441 | error = dlerror(); |
971aa868 CB |
442 | if (error) |
443 | return log_error(-1, "%s - Failed to find cg_access()", error); | |
bddbb106 | 444 | |
9ce186dc | 445 | return __cg_access(path, mode); |
bddbb106 SH |
446 | } |
447 | ||
237e200e | 448 | static int do_proc_open(const char *path, struct fuse_file_info *fi) |
758ad80c | 449 | { |
237e200e | 450 | char *error; |
971aa868 CB |
451 | int (*__proc_open)(const char *path, struct fuse_file_info *fi); |
452 | ||
453 | dlerror(); | |
454 | __proc_open = (int (*)(const char *path, struct fuse_file_info *fi))dlsym(dlopen_handle, "proc_open"); | |
237e200e | 455 | error = dlerror(); |
971aa868 CB |
456 | if (error) |
457 | return log_error(-1, "%s - Failed to find proc_open()", error); | |
35629743 | 458 | |
9ce186dc | 459 | return __proc_open(path, fi); |
35629743 SH |
460 | } |
461 | ||
bddbb106 SH |
462 | static int do_proc_access(const char *path, int mode) |
463 | { | |
bddbb106 | 464 | char *error; |
971aa868 CB |
465 | int (*__proc_access)(const char *path, int mode); |
466 | ||
467 | dlerror(); | |
468 | __proc_access = (int (*)(const char *, int mode))dlsym(dlopen_handle, "proc_access"); | |
bddbb106 | 469 | error = dlerror(); |
971aa868 CB |
470 | if (error) |
471 | return log_error(-1, "%s - Failed to find proc_access()", error); | |
bddbb106 | 472 | |
9ce186dc | 473 | return __proc_access(path, mode); |
bddbb106 SH |
474 | } |
475 | ||
71f17cd2 YB |
476 | static int do_sys_open(const char *path, struct fuse_file_info *fi) |
477 | { | |
71f17cd2 | 478 | char *error; |
971aa868 CB |
479 | int (*__sys_open)(const char *path, struct fuse_file_info *fi); |
480 | ||
481 | dlerror(); | |
482 | __sys_open = (int (*)(const char *path, struct fuse_file_info *fi))dlsym(dlopen_handle, "sys_open"); | |
71f17cd2 | 483 | error = dlerror(); |
971aa868 CB |
484 | if (error) |
485 | return log_error(-1, "%s - Failed to find sys_open()", error); | |
71f17cd2 | 486 | |
9ce186dc | 487 | return __sys_open(path, fi); |
71f17cd2 YB |
488 | } |
489 | ||
26b717d0 ZL |
490 | static int do_sys_opendir(const char *path, struct fuse_file_info *fi) |
491 | { | |
492 | char *error; | |
493 | int (*__sys_opendir)(const char *path, struct fuse_file_info *fi); | |
494 | ||
495 | dlerror(); | |
496 | __sys_opendir = (int (*)(const char *path, struct fuse_file_info *fi))dlsym(dlopen_handle, "sys_opendir"); | |
497 | error = dlerror(); | |
498 | if (error) | |
499 | return log_error(-1, "%s - Failed to find sys_opendir()", error); | |
500 | ||
501 | return __sys_opendir(path, fi); | |
502 | } | |
503 | ||
71f17cd2 YB |
504 | static int do_sys_access(const char *path, int mode) |
505 | { | |
71f17cd2 | 506 | char *error; |
971aa868 CB |
507 | int (*__sys_access)(const char *path, int mode); |
508 | ||
509 | dlerror(); | |
510 | __sys_access = (int (*)(const char *, int mode))dlsym(dlopen_handle, "sys_access"); | |
71f17cd2 | 511 | error = dlerror(); |
971aa868 CB |
512 | if (error) |
513 | return log_error(-1, "%s - Failed to find sys_access()", error); | |
71f17cd2 | 514 | |
9ce186dc | 515 | return __sys_access(path, mode); |
71f17cd2 YB |
516 | } |
517 | ||
237e200e | 518 | static int do_cg_release(const char *path, struct fuse_file_info *fi) |
35629743 | 519 | { |
237e200e | 520 | char *error; |
971aa868 CB |
521 | int (*__cg_release)(const char *path, struct fuse_file_info *fi); |
522 | ||
523 | dlerror(); | |
524 | __cg_release = (int (*)(const char *path, struct fuse_file_info *))dlsym(dlopen_handle, "cg_release"); | |
237e200e | 525 | error = dlerror(); |
971aa868 CB |
526 | if (error) |
527 | return log_error(-1, "%s - Failed to find cg_release()", error); | |
237e200e | 528 | |
9ce186dc | 529 | return __cg_release(path, fi); |
758ad80c SH |
530 | } |
531 | ||
237e200e | 532 | static int do_proc_release(const char *path, struct fuse_file_info *fi) |
35629743 | 533 | { |
237e200e | 534 | char *error; |
971aa868 CB |
535 | int (*__proc_release)(const char *path, struct fuse_file_info *fi); |
536 | ||
537 | dlerror(); | |
9ce186dc | 538 | __proc_release = (int (*)(const char *path, struct fuse_file_info *)) dlsym(dlopen_handle, "proc_release"); |
237e200e | 539 | error = dlerror(); |
971aa868 CB |
540 | if (error) |
541 | return log_error(-1, "%s - Failed to find proc_release()", error); | |
97f1f27b | 542 | |
9ce186dc | 543 | return __proc_release(path, fi); |
96fc5ee6 SH |
544 | } |
545 | ||
71f17cd2 YB |
546 | static int do_sys_release(const char *path, struct fuse_file_info *fi) |
547 | { | |
71f17cd2 | 548 | char *error; |
971aa868 CB |
549 | int (*__sys_release)(const char *path, struct fuse_file_info *fi); |
550 | ||
551 | dlerror(); | |
552 | __sys_release = (int (*)(const char *path, struct fuse_file_info *))dlsym(dlopen_handle, "sys_release"); | |
71f17cd2 | 553 | error = dlerror(); |
971aa868 CB |
554 | if (error) |
555 | return log_error(-1, "%s - Failed to find sys_release()", error); | |
71f17cd2 | 556 | |
9ce186dc | 557 | return __sys_release(path, fi); |
71f17cd2 YB |
558 | } |
559 | ||
237e200e | 560 | static int do_cg_opendir(const char *path, struct fuse_file_info *fi) |
96fc5ee6 | 561 | { |
237e200e | 562 | char *error; |
971aa868 CB |
563 | int (*__cg_opendir)(const char *path, struct fuse_file_info *fi); |
564 | ||
565 | dlerror(); | |
566 | __cg_opendir = (int (*)(const char *path, struct fuse_file_info *fi))dlsym(dlopen_handle, "cg_opendir"); | |
237e200e | 567 | error = dlerror(); |
971aa868 CB |
568 | if (error) |
569 | return log_error(-1, "%s - Failed to find cg_opendir()", error); | |
96fc5ee6 | 570 | |
9ce186dc | 571 | return __cg_opendir(path, fi); |
35629743 SH |
572 | } |
573 | ||
237e200e | 574 | static int do_cg_releasedir(const char *path, struct fuse_file_info *fi) |
35629743 | 575 | { |
237e200e | 576 | char *error; |
971aa868 CB |
577 | int (*__cg_releasedir)(const char *path, struct fuse_file_info *fi); |
578 | ||
579 | dlerror(); | |
580 | __cg_releasedir = (int (*)(const char *path, struct fuse_file_info *))dlsym(dlopen_handle, "cg_releasedir"); | |
237e200e | 581 | error = dlerror(); |
971aa868 CB |
582 | if (error) |
583 | return log_error(-1, "%s - Failed to find cg_releasedir()", error); | |
237e200e | 584 | |
9ce186dc | 585 | return __cg_releasedir(path, fi); |
35629743 SH |
586 | } |
587 | ||
71f17cd2 YB |
588 | static int do_sys_releasedir(const char *path, struct fuse_file_info *fi) |
589 | { | |
71f17cd2 | 590 | char *error; |
971aa868 CB |
591 | int (*__sys_releasedir)(const char *path, struct fuse_file_info *fi); |
592 | ||
593 | dlerror(); | |
594 | __sys_releasedir = (int (*)(const char *path, struct fuse_file_info *))dlsym(dlopen_handle, "sys_releasedir"); | |
71f17cd2 | 595 | error = dlerror(); |
971aa868 CB |
596 | if (error) |
597 | return log_error(-1, "%s - Failed to find sys_releasedir()", error); | |
71f17cd2 | 598 | |
9ce186dc | 599 | return __sys_releasedir(path, fi); |
71f17cd2 YB |
600 | } |
601 | ||
cb61c9e1 | 602 | #if HAVE_FUSE3 |
f834b6bf SP |
603 | static int lxcfs_getattr(const char *path, struct stat *sb, struct fuse_file_info *fi) |
604 | #else | |
758ad80c | 605 | static int lxcfs_getattr(const char *path, struct stat *sb) |
f834b6bf | 606 | #endif |
758ad80c | 607 | { |
237e200e | 608 | int ret; |
17e6e1e2 CB |
609 | struct timespec now; |
610 | ||
758ad80c | 611 | if (strcmp(path, "/") == 0) { |
17e6e1e2 CB |
612 | if (clock_gettime(CLOCK_REALTIME, &now) < 0) |
613 | return -EINVAL; | |
614 | sb->st_uid = sb->st_gid = 0; | |
615 | sb->st_atim = sb->st_mtim = sb->st_ctim = now; | |
616 | sb->st_size = 0; | |
758ad80c SH |
617 | sb->st_mode = S_IFDIR | 00755; |
618 | sb->st_nlink = 2; | |
619 | return 0; | |
620 | } | |
17e6e1e2 | 621 | |
758ad80c | 622 | if (strncmp(path, "/cgroup", 7) == 0) { |
237e200e SH |
623 | up_users(); |
624 | ret = do_cg_getattr(path, sb); | |
625 | down_users(); | |
626 | return ret; | |
758ad80c | 627 | } |
971aa868 | 628 | |
35629743 | 629 | if (strncmp(path, "/proc", 5) == 0) { |
237e200e SH |
630 | up_users(); |
631 | ret = do_proc_getattr(path, sb); | |
632 | down_users(); | |
633 | return ret; | |
758ad80c | 634 | } |
971aa868 | 635 | |
71f17cd2 YB |
636 | if (strncmp(path, "/sys", 4) == 0) { |
637 | up_users(); | |
638 | ret = do_sys_getattr(path, sb); | |
639 | down_users(); | |
640 | return ret; | |
641 | } | |
971aa868 | 642 | |
f9b24a3e | 643 | return -ENOENT; |
758ad80c SH |
644 | } |
645 | ||
646 | static int lxcfs_opendir(const char *path, struct fuse_file_info *fi) | |
647 | { | |
237e200e | 648 | int ret; |
971aa868 | 649 | |
758ad80c SH |
650 | if (strcmp(path, "/") == 0) |
651 | return 0; | |
652 | ||
653 | if (strncmp(path, "/cgroup", 7) == 0) { | |
237e200e SH |
654 | up_users(); |
655 | ret = do_cg_opendir(path, fi); | |
656 | down_users(); | |
657 | return ret; | |
758ad80c | 658 | } |
971aa868 | 659 | |
35629743 SH |
660 | if (strcmp(path, "/proc") == 0) |
661 | return 0; | |
971aa868 | 662 | |
26b717d0 ZL |
663 | if (strncmp(path, "/sys", 4) == 0) { |
664 | up_users(); | |
665 | ret = do_sys_opendir(path, fi); | |
666 | down_users(); | |
667 | return ret; | |
668 | } | |
71f17cd2 | 669 | |
35629743 | 670 | return -ENOENT; |
758ad80c SH |
671 | } |
672 | ||
cb61c9e1 | 673 | #if HAVE_FUSE3 |
f834b6bf SP |
674 | static int lxcfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
675 | off_t offset, struct fuse_file_info *fi, enum fuse_readdir_flags flags) | |
676 | #else | |
971aa868 CB |
677 | static int lxcfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, |
678 | off_t offset, struct fuse_file_info *fi) | |
f834b6bf | 679 | #endif |
758ad80c | 680 | { |
237e200e | 681 | int ret; |
971aa868 | 682 | |
758ad80c | 683 | if (strcmp(path, "/") == 0) { |
5aff2eb2 CBM |
684 | if (dir_filler(filler, buf, ".", 0) != 0 || |
685 | dir_filler(filler, buf, "..", 0) != 0 || | |
686 | dir_filler(filler, buf, "proc", 0) != 0 || | |
687 | dir_filler(filler, buf, "sys", 0) != 0 || | |
688 | dir_filler(filler, buf, "cgroup", 0) != 0) | |
f9b24a3e | 689 | return -ENOMEM; |
971aa868 | 690 | |
758ad80c SH |
691 | return 0; |
692 | } | |
971aa868 | 693 | |
237e200e SH |
694 | if (strncmp(path, "/cgroup", 7) == 0) { |
695 | up_users(); | |
696 | ret = do_cg_readdir(path, buf, filler, offset, fi); | |
697 | down_users(); | |
698 | return ret; | |
699 | } | |
971aa868 | 700 | |
237e200e SH |
701 | if (strcmp(path, "/proc") == 0) { |
702 | up_users(); | |
703 | ret = do_proc_readdir(path, buf, filler, offset, fi); | |
704 | down_users(); | |
705 | return ret; | |
706 | } | |
71f17cd2 YB |
707 | |
708 | if (strncmp(path, "/sys", 4) == 0) { | |
709 | up_users(); | |
710 | ret = do_sys_readdir(path, buf, filler, offset, fi); | |
711 | down_users(); | |
712 | return ret; | |
713 | } | |
714 | ||
f9b24a3e | 715 | return -ENOENT; |
758ad80c SH |
716 | } |
717 | ||
bddbb106 SH |
718 | static int lxcfs_access(const char *path, int mode) |
719 | { | |
720 | int ret; | |
17e6e1e2 | 721 | |
f9b24a3e | 722 | if (strcmp(path, "/") == 0 && (mode & W_OK) == 0) |
17e6e1e2 CB |
723 | return 0; |
724 | ||
bddbb106 SH |
725 | if (strncmp(path, "/cgroup", 7) == 0) { |
726 | up_users(); | |
727 | ret = do_cg_access(path, mode); | |
728 | down_users(); | |
729 | return ret; | |
730 | } | |
971aa868 | 731 | |
bddbb106 SH |
732 | if (strncmp(path, "/proc", 5) == 0) { |
733 | up_users(); | |
734 | ret = do_proc_access(path, mode); | |
735 | down_users(); | |
736 | return ret; | |
737 | } | |
971aa868 | 738 | |
71f17cd2 YB |
739 | if (strncmp(path, "/sys", 4) == 0) { |
740 | up_users(); | |
741 | ret = do_sys_access(path, mode); | |
742 | down_users(); | |
743 | return ret; | |
744 | } | |
745 | ||
f9b24a3e | 746 | return -EACCES; |
bddbb106 SH |
747 | } |
748 | ||
758ad80c SH |
749 | static int lxcfs_releasedir(const char *path, struct fuse_file_info *fi) |
750 | { | |
237e200e | 751 | int ret; |
971aa868 | 752 | |
758ad80c SH |
753 | if (strcmp(path, "/") == 0) |
754 | return 0; | |
971aa868 | 755 | |
758ad80c | 756 | if (strncmp(path, "/cgroup", 7) == 0) { |
237e200e SH |
757 | up_users(); |
758 | ret = do_cg_releasedir(path, fi); | |
759 | down_users(); | |
760 | return ret; | |
758ad80c | 761 | } |
971aa868 | 762 | |
35629743 SH |
763 | if (strcmp(path, "/proc") == 0) |
764 | return 0; | |
971aa868 CB |
765 | |
766 | if (strncmp(path, "/sys", 4) == 0) { | |
71f17cd2 YB |
767 | up_users(); |
768 | ret = do_sys_releasedir(path, fi); | |
769 | down_users(); | |
770 | return ret; | |
771 | } | |
772 | ||
758ad80c SH |
773 | return -EINVAL; |
774 | } | |
775 | ||
99978832 SH |
776 | static int lxcfs_open(const char *path, struct fuse_file_info *fi) |
777 | { | |
237e200e | 778 | int ret; |
971aa868 | 779 | |
237e200e SH |
780 | if (strncmp(path, "/cgroup", 7) == 0) { |
781 | up_users(); | |
782 | ret = do_cg_open(path, fi); | |
783 | down_users(); | |
784 | return ret; | |
785 | } | |
971aa868 | 786 | |
237e200e SH |
787 | if (strncmp(path, "/proc", 5) == 0) { |
788 | up_users(); | |
789 | ret = do_proc_open(path, fi); | |
790 | down_users(); | |
791 | return ret; | |
792 | } | |
971aa868 | 793 | |
71f17cd2 YB |
794 | if (strncmp(path, "/sys", 4) == 0) { |
795 | up_users(); | |
796 | ret = do_sys_open(path, fi); | |
797 | down_users(); | |
798 | return ret; | |
799 | } | |
800 | ||
f9b24a3e | 801 | return -EACCES; |
99978832 SH |
802 | } |
803 | ||
804 | static int lxcfs_read(const char *path, char *buf, size_t size, off_t offset, | |
971aa868 | 805 | struct fuse_file_info *fi) |
99978832 | 806 | { |
237e200e | 807 | int ret; |
971aa868 | 808 | |
237e200e SH |
809 | if (strncmp(path, "/cgroup", 7) == 0) { |
810 | up_users(); | |
811 | ret = do_cg_read(path, buf, size, offset, fi); | |
812 | down_users(); | |
813 | return ret; | |
814 | } | |
971aa868 | 815 | |
237e200e SH |
816 | if (strncmp(path, "/proc", 5) == 0) { |
817 | up_users(); | |
818 | ret = do_proc_read(path, buf, size, offset, fi); | |
819 | down_users(); | |
820 | return ret; | |
821 | } | |
971aa868 | 822 | |
71f17cd2 YB |
823 | if (strncmp(path, "/sys", 4) == 0) { |
824 | up_users(); | |
825 | ret = do_sys_read(path, buf, size, offset, fi); | |
826 | down_users(); | |
827 | return ret; | |
828 | } | |
829 | ||
99978832 SH |
830 | return -EINVAL; |
831 | } | |
832 | ||
2ad6d2bd | 833 | int lxcfs_write(const char *path, const char *buf, size_t size, off_t offset, |
971aa868 | 834 | struct fuse_file_info *fi) |
2ad6d2bd | 835 | { |
237e200e | 836 | int ret; |
971aa868 | 837 | |
2ad6d2bd | 838 | if (strncmp(path, "/cgroup", 7) == 0) { |
237e200e SH |
839 | up_users(); |
840 | ret = do_cg_write(path, buf, size, offset, fi); | |
841 | down_users(); | |
842 | return ret; | |
2ad6d2bd SH |
843 | } |
844 | ||
26b717d0 ZL |
845 | if (strncmp(path, "/sys", 4) == 0) { |
846 | up_users(); | |
847 | ret = do_sys_write(path, buf, size, offset, fi); | |
848 | down_users(); | |
849 | return ret; | |
850 | } | |
851 | ||
852 | return -EINVAL; | |
853 | } | |
854 | ||
855 | int lxcfs_readlink(const char *path, char *buf, size_t size) | |
856 | { | |
857 | int ret; | |
858 | ||
859 | if (strncmp(path, "/sys", 4) == 0) { | |
860 | up_users(); | |
861 | ret = do_sys_readlink(path, buf, size); | |
862 | down_users(); | |
863 | return ret; | |
864 | } | |
865 | ||
2ad6d2bd SH |
866 | return -EINVAL; |
867 | } | |
868 | ||
99978832 SH |
869 | static int lxcfs_flush(const char *path, struct fuse_file_info *fi) |
870 | { | |
871 | return 0; | |
872 | } | |
873 | ||
874 | static int lxcfs_release(const char *path, struct fuse_file_info *fi) | |
758ad80c | 875 | { |
237e200e | 876 | int ret; |
971aa868 | 877 | |
237e200e SH |
878 | if (strncmp(path, "/cgroup", 7) == 0) { |
879 | up_users(); | |
880 | ret = do_cg_release(path, fi); | |
881 | down_users(); | |
882 | return ret; | |
883 | } | |
971aa868 | 884 | |
237e200e SH |
885 | if (strncmp(path, "/proc", 5) == 0) { |
886 | up_users(); | |
887 | ret = do_proc_release(path, fi); | |
888 | down_users(); | |
889 | return ret; | |
890 | } | |
971aa868 | 891 | |
71f17cd2 YB |
892 | if (strncmp(path, "/sys", 4) == 0) { |
893 | up_users(); | |
894 | ret = do_sys_release(path, fi); | |
895 | down_users(); | |
896 | return ret; | |
897 | } | |
898 | ||
8f6e8f5e | 899 | return -EINVAL; |
99978832 SH |
900 | } |
901 | ||
902 | static int lxcfs_fsync(const char *path, int datasync, struct fuse_file_info *fi) | |
903 | { | |
904 | return 0; | |
758ad80c SH |
905 | } |
906 | ||
ab54b798 SH |
907 | int lxcfs_mkdir(const char *path, mode_t mode) |
908 | { | |
237e200e | 909 | int ret; |
971aa868 | 910 | |
237e200e SH |
911 | if (strncmp(path, "/cgroup", 7) == 0) { |
912 | up_users(); | |
913 | ret = do_cg_mkdir(path, mode); | |
914 | down_users(); | |
915 | return ret; | |
916 | } | |
ab54b798 | 917 | |
f9b24a3e | 918 | return -EPERM; |
ab54b798 SH |
919 | } |
920 | ||
cb61c9e1 | 921 | #if HAVE_FUSE3 |
f834b6bf SP |
922 | int lxcfs_chown(const char *path, uid_t uid, gid_t gid, struct fuse_file_info *fi) |
923 | #else | |
341b21ad | 924 | int lxcfs_chown(const char *path, uid_t uid, gid_t gid) |
f834b6bf | 925 | #endif |
341b21ad | 926 | { |
237e200e | 927 | int ret; |
971aa868 | 928 | |
237e200e SH |
929 | if (strncmp(path, "/cgroup", 7) == 0) { |
930 | up_users(); | |
931 | ret = do_cg_chown(path, uid, gid); | |
932 | down_users(); | |
933 | return ret; | |
934 | } | |
341b21ad | 935 | |
f9b24a3e CB |
936 | if (strncmp(path, "/proc", 5) == 0) |
937 | return -EPERM; | |
938 | ||
1f5596dd | 939 | if (strncmp(path, "/sys", 4) == 0) |
71f17cd2 | 940 | return -EPERM; |
971aa868 | 941 | |
f9b24a3e | 942 | return -ENOENT; |
341b21ad SH |
943 | } |
944 | ||
2ad6d2bd SH |
945 | /* |
946 | * cat first does a truncate before doing ops->write. This doesn't | |
947 | * really make sense for cgroups. So just return 0 always but do | |
948 | * nothing. | |
949 | */ | |
cb61c9e1 | 950 | #if HAVE_FUSE3 |
f834b6bf SP |
951 | int lxcfs_truncate(const char *path, off_t newsize, struct fuse_file_info *fi) |
952 | #else | |
2ad6d2bd | 953 | int lxcfs_truncate(const char *path, off_t newsize) |
f834b6bf | 954 | #endif |
2ad6d2bd SH |
955 | { |
956 | if (strncmp(path, "/cgroup", 7) == 0) | |
957 | return 0; | |
971aa868 | 958 | |
26b717d0 ZL |
959 | if (strncmp(path, "/sys", 4) == 0) |
960 | return 0; | |
961 | ||
f9b24a3e | 962 | return -EPERM; |
2ad6d2bd SH |
963 | } |
964 | ||
50d8d5b5 SH |
965 | int lxcfs_rmdir(const char *path) |
966 | { | |
237e200e | 967 | int ret; |
971aa868 | 968 | |
237e200e SH |
969 | if (strncmp(path, "/cgroup", 7) == 0) { |
970 | up_users(); | |
971 | ret = do_cg_rmdir(path); | |
972 | down_users(); | |
973 | return ret; | |
974 | } | |
971aa868 | 975 | |
f9b24a3e | 976 | return -EPERM; |
50d8d5b5 SH |
977 | } |
978 | ||
cb61c9e1 | 979 | #if HAVE_FUSE3 |
f834b6bf SP |
980 | int lxcfs_chmod(const char *path, mode_t mode, struct fuse_file_info *fi) |
981 | #else | |
fd2e4e03 | 982 | int lxcfs_chmod(const char *path, mode_t mode) |
f834b6bf | 983 | #endif |
fd2e4e03 | 984 | { |
237e200e | 985 | int ret; |
971aa868 | 986 | |
237e200e SH |
987 | if (strncmp(path, "/cgroup", 7) == 0) { |
988 | up_users(); | |
989 | ret = do_cg_chmod(path, mode); | |
990 | down_users(); | |
991 | return ret; | |
992 | } | |
f9b24a3e CB |
993 | |
994 | if (strncmp(path, "/proc", 5) == 0) | |
995 | return -EPERM; | |
996 | ||
71f17cd2 YB |
997 | if (strncmp(path, "/sys", 4) == 0) |
998 | return -EPERM; | |
999 | ||
f9b24a3e | 1000 | return -ENOENT; |
fd2e4e03 SH |
1001 | } |
1002 | ||
cb61c9e1 | 1003 | #if HAVE_FUSE3 |
285aea40 | 1004 | static void *lxcfs_init(struct fuse_conn_info *conn, struct fuse_config *cfg) |
0d5383b7 CB |
1005 | #else |
1006 | static void *lxcfs_init(struct fuse_conn_info *conn) | |
1007 | #endif | |
285aea40 CB |
1008 | { |
1009 | char *error; | |
0d5383b7 | 1010 | void *(*__lxcfs_fuse_init)(struct fuse_conn_info * conn, void * cfg); |
285aea40 CB |
1011 | |
1012 | dlerror(); | |
0d5383b7 | 1013 | __lxcfs_fuse_init = (void *(*)(struct fuse_conn_info * conn, void * cfg))dlsym(dlopen_handle, "lxcfs_fuse_init"); |
285aea40 CB |
1014 | error = dlerror(); |
1015 | if (error) | |
1016 | return log_error(NULL, "%s - Failed to find lxcfs_fuse_init()", error); | |
1017 | ||
0d5383b7 | 1018 | return __lxcfs_fuse_init(conn, NULL); |
285aea40 CB |
1019 | } |
1020 | ||
758ad80c | 1021 | const struct fuse_operations lxcfs_ops = { |
971aa868 CB |
1022 | .access = lxcfs_access, |
1023 | .chmod = lxcfs_chmod, | |
1024 | .chown = lxcfs_chown, | |
1025 | .flush = lxcfs_flush, | |
1026 | .fsync = lxcfs_fsync, | |
1027 | .getattr = lxcfs_getattr, | |
285aea40 | 1028 | .init = lxcfs_init, |
971aa868 CB |
1029 | .mkdir = lxcfs_mkdir, |
1030 | .open = lxcfs_open, | |
1031 | .opendir = lxcfs_opendir, | |
1032 | .read = lxcfs_read, | |
1033 | .readdir = lxcfs_readdir, | |
1034 | .release = lxcfs_release, | |
1035 | .releasedir = lxcfs_releasedir, | |
1036 | .rmdir = lxcfs_rmdir, | |
1037 | .truncate = lxcfs_truncate, | |
1038 | .write = lxcfs_write, | |
26b717d0 | 1039 | .readlink = lxcfs_readlink, |
971aa868 CB |
1040 | |
1041 | .create = NULL, | |
1042 | .destroy = NULL, | |
cb61c9e1 | 1043 | #if !HAVE_FUSE3 |
971aa868 | 1044 | .fgetattr = NULL, |
f834b6bf | 1045 | #endif |
971aa868 | 1046 | .fsyncdir = NULL, |
cb61c9e1 | 1047 | #if !HAVE_FUSE3 |
971aa868 CB |
1048 | .ftruncate = NULL, |
1049 | .getdir = NULL, | |
f834b6bf | 1050 | #endif |
971aa868 | 1051 | .getxattr = NULL, |
971aa868 CB |
1052 | .link = NULL, |
1053 | .listxattr = NULL, | |
1054 | .mknod = NULL, | |
971aa868 CB |
1055 | .rename = NULL, |
1056 | .removexattr = NULL, | |
1057 | .setxattr = NULL, | |
1058 | .statfs = NULL, | |
1059 | .symlink = NULL, | |
1060 | .unlink = NULL, | |
cb61c9e1 | 1061 | #if !HAVE_FUSE3 |
971aa868 | 1062 | .utime = NULL, |
f834b6bf | 1063 | #endif |
758ad80c SH |
1064 | }; |
1065 | ||
9b96e96e | 1066 | static void usage(void) |
758ad80c | 1067 | { |
a47192da | 1068 | lxcfs_info("Usage: lxcfs <directory>\n"); |
077d9d2f | 1069 | lxcfs_info("lxcfs is a FUSE-based proc, sys and cgroup virtualizing filesystem\n"); |
a47192da | 1070 | lxcfs_info("Options :"); |
b40c8afe | 1071 | lxcfs_info(" -d, --debug Run lxcfs with debugging enabled"); |
b40c8afe CB |
1072 | lxcfs_info(" -f, --foreground Run lxcfs in the foreground"); |
1073 | lxcfs_info(" -n, --help Print help"); | |
1074 | lxcfs_info(" -l, --enable-loadavg Enable loadavg virtualization"); | |
1075 | lxcfs_info(" -o Options to pass directly through fuse"); | |
1076 | lxcfs_info(" -p, --pidfile=FILE Path to use for storing lxcfs pid"); | |
1077 | lxcfs_info(" Default pidfile is %s/lxcfs.pid", RUNTIME_PATH); | |
1078 | lxcfs_info(" -u, --disable-swap Disable swap virtualization"); | |
1079 | lxcfs_info(" -v, --version Print lxcfs version"); | |
23ffaadd | 1080 | lxcfs_info(" --enable-cfs Enable CPU virtualization via CPU shares"); |
b40c8afe | 1081 | lxcfs_info(" --enable-pidfd Use pidfd for process tracking"); |
b0073134 | 1082 | exit(EXIT_FAILURE); |
758ad80c SH |
1083 | } |
1084 | ||
e190ee91 SH |
1085 | static int set_pidfile(char *pidfile) |
1086 | { | |
05b7a16d | 1087 | __do_close int fd = -EBADF; |
971aa868 CB |
1088 | char buf[INTTYPE_TO_STRLEN(long)]; |
1089 | int ret; | |
1090 | struct flock fl = { | |
b4bc238c CB |
1091 | .l_type = F_WRLCK, |
1092 | .l_whence = SEEK_SET, | |
1093 | .l_start = 0, | |
1094 | .l_len = 0, | |
971aa868 | 1095 | }; |
e190ee91 | 1096 | |
3326c17e | 1097 | fd = open(pidfile, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | O_CLOEXEC); |
971aa868 CB |
1098 | if (fd < 0) |
1099 | return log_error(-1, "Could not open pidfile %s: %m", pidfile); | |
e190ee91 | 1100 | |
971aa868 | 1101 | if (fcntl(fd, F_SETLK, &fl) < 0) { |
12a60884 | 1102 | if (errno == EAGAIN || errno == EACCES) |
971aa868 CB |
1103 | return log_error(-1, "PID file '%s' is already locked", pidfile); |
1104 | lxcfs_error("Warning; unable to lock PID file, proceeding"); | |
e190ee91 SH |
1105 | } |
1106 | ||
12a60884 | 1107 | if (ftruncate(fd, 0)) |
971aa868 CB |
1108 | return log_error(-1, "Error truncating PID file '%s': %m", pidfile); |
1109 | ||
1110 | ret = snprintf(buf, sizeof(buf), "%ld\n", (long)getpid()); | |
3cf1e562 | 1111 | if (ret < 0 || (size_t)ret >= sizeof(buf)) |
971aa868 | 1112 | return log_error(-1, "Failed to convert pid to string %m"); |
e190ee91 | 1113 | |
971aa868 CB |
1114 | if (write(fd, buf, ret) != ret) |
1115 | return log_error(-1, "Error writing to PID file '%s': %m", pidfile); | |
e190ee91 | 1116 | |
12a60884 | 1117 | return move_fd(fd); |
e190ee91 SH |
1118 | } |
1119 | ||
64a7d94d | 1120 | static const struct option long_options[] = { |
1121 | {"debug", no_argument, 0, 'd' }, | |
1122 | {"disable-swap", no_argument, 0, 'u' }, | |
1123 | {"enable-loadavg", no_argument, 0, 'l' }, | |
1124 | {"foreground", no_argument, 0, 'f' }, | |
1125 | {"help", no_argument, 0, 'h' }, | |
1126 | {"version", no_argument, 0, 'v' }, | |
1127 | ||
1128 | {"enable-cfs", no_argument, 0, 0 }, | |
1129 | {"enable-pidfd", no_argument, 0, 0 }, | |
1130 | ||
1131 | {"pidfile", required_argument, 0, 'p' }, | |
1132 | { }, | |
1133 | }; | |
1134 | ||
1135 | static int append_comma_separate(char **s, const char *append) | |
1136 | { | |
1137 | int ret; | |
1138 | char *news; | |
1139 | size_t append_len, len; | |
1140 | ||
1141 | if (!append) | |
1142 | return 0; | |
1143 | ||
1144 | append_len = strlen(append); | |
1145 | if (!append_len) | |
1146 | return 0; | |
1147 | ||
1148 | if (*s) { | |
1149 | len = strlen(*s); | |
1150 | news = realloc(*s, len + append_len + 2); | |
1151 | } else { | |
1152 | len = 0; | |
1153 | news = realloc(NULL, append_len + 1); | |
1154 | } | |
1155 | if (!news) | |
1156 | return -ENOMEM; | |
1157 | ||
1158 | if (*s) | |
1159 | ret = snprintf(news + len, append_len + 2, ",%s", append); | |
1160 | else | |
1161 | ret = snprintf(news, append_len + 1, "%s", append); | |
1162 | if (ret < 0) | |
1163 | return -EIO; | |
1164 | ||
1165 | *s = news; | |
1166 | return 0; | |
1167 | } | |
1168 | ||
758ad80c SH |
1169 | int main(int argc, char *argv[]) |
1170 | { | |
05b7a16d | 1171 | int pidfile_fd = -EBADF; |
47f5266f | 1172 | int ret = EXIT_FAILURE; |
64a7d94d | 1173 | char *pidfile = NULL, *token = NULL; |
bae92d21 | 1174 | char pidfile_buf[STRLITERALLEN(RUNTIME_PATH) + STRLITERALLEN("/lxcfs.pid") + 1] = {}; |
51c38c8b | 1175 | bool debug = false, foreground = false; |
cb61c9e1 | 1176 | #if !HAVE_FUSE3 |
51c38c8b SP |
1177 | bool nonempty = false; |
1178 | #endif | |
6db4f7a3 | 1179 | bool load_use = false; |
0b0f73db SH |
1180 | /* |
1181 | * what we pass to fuse_main is: | |
1de81503 | 1182 | * argv[0] -s [-f|-d] -o allow_other,directio argv[1] NULL |
0b0f73db | 1183 | */ |
64a7d94d | 1184 | int fuse_argc = 0; |
1185 | int c, idx, new_argc; | |
1186 | char *fuse_argv[7]; | |
1187 | const char *fuse_opts = NULL; | |
1188 | char *new_fuse_opts = NULL; | |
1189 | char *const *new_argv; | |
7e60aa1b | 1190 | struct lxcfs_opts *opts; |
4ec5c9da | 1191 | |
7e60aa1b | 1192 | opts = malloc(sizeof(struct lxcfs_opts)); |
1193 | if (opts == NULL) { | |
971aa868 | 1194 | lxcfs_error("Error allocating memory for options"); |
7e60aa1b | 1195 | goto out; |
1196 | } | |
64a7d94d | 1197 | |
7e60aa1b | 1198 | opts->swap_off = false; |
2aa59b2e | 1199 | opts->use_pidfd = false; |
3b24c6c4 | 1200 | opts->use_cfs = false; |
285aea40 | 1201 | opts->version = 1; |
7e60aa1b | 1202 | |
64a7d94d | 1203 | while ((c = getopt_long(argc, argv, "dulfhvso:p:", long_options, &idx)) != -1) { |
1204 | switch (c) { | |
1205 | case 0: | |
1206 | if (strcmp(long_options[idx].name, "enable-pidfd") == 0) | |
1207 | opts->use_pidfd = true; | |
1208 | else if (strcmp(long_options[idx].name, "enable-cfs") == 0) | |
1209 | opts->use_cfs = true; | |
1210 | else | |
1211 | usage(); | |
1212 | break; | |
1213 | case 'd': | |
1214 | debug = true; | |
1215 | break; | |
1216 | case 'f': | |
1217 | foreground = true; | |
1218 | break; | |
1219 | case 'l': | |
1220 | load_use = true; | |
1221 | break; | |
1222 | case 'o': | |
1223 | if (fuse_opts) { | |
1224 | lxcfs_error("Specifying -o multiple times is unsupported"); | |
1225 | usage(); | |
1226 | } | |
b0073134 | 1227 | |
64a7d94d | 1228 | fuse_opts = optarg; |
1229 | break; | |
1230 | case 'p': | |
1231 | pidfile = optarg; | |
1232 | break; | |
1233 | case 's': | |
1234 | /* legacy argument: ignore */ | |
1235 | break; | |
1236 | case 'u': | |
1237 | opts->swap_off = true; | |
1238 | break; | |
10deeaaf | 1239 | case 'v': |
10deeaaf | 1240 | lxcfs_info("%s", STRINGIFY(PROJECT_VERSION)); |
1241 | exit(EXIT_SUCCESS); | |
64a7d94d | 1242 | default: |
1243 | usage(); | |
1244 | } | |
1245 | } | |
b0073134 CB |
1246 | |
1247 | if (foreground && debug) | |
1248 | log_exit("Both --debug and --forgreound specified"); | |
1249 | ||
64a7d94d | 1250 | new_argv = &argv[optind]; |
1251 | new_argc = argc - optind; | |
c021765e CB |
1252 | |
1253 | /* Older LXCFS versions printed help when used without any argument. */ | |
1254 | if (new_argc == 0) | |
10deeaaf | 1255 | usage(); |
c021765e | 1256 | |
64a7d94d | 1257 | if (new_argc != 1) { |
1258 | lxcfs_error("Missing mountpoint"); | |
1259 | goto out; | |
1260 | } | |
1261 | ||
1262 | fuse_argv[fuse_argc++] = argv[0]; | |
1263 | if (debug) | |
1264 | fuse_argv[fuse_argc++] = "-d"; | |
1265 | else | |
1266 | fuse_argv[fuse_argc++] = "-f"; | |
1267 | fuse_argv[fuse_argc++] = "-o"; | |
1268 | ||
1269 | /* Parse additional fuse options. */ | |
1270 | if (fuse_opts) { | |
1271 | char *dup; | |
1272 | ||
1273 | dup = strdup(fuse_opts); | |
1274 | if (!dup) { | |
1275 | lxcfs_error("Failed to copy fuse options"); | |
1276 | goto out; | |
1277 | } | |
1278 | ||
1279 | lxc_iterate_parts(token, dup, ",") { | |
1280 | /* default */ | |
1281 | if (strcmp(token, "allow_other") == 0) | |
1282 | continue; | |
1283 | ||
1284 | /* default for LXCFS */ | |
1285 | if (strcmp(token, "direct_io") == 0) | |
1286 | continue; | |
1287 | ||
1288 | /* default for LXCFS */ | |
1289 | if (strncmp(token, "entry_timeout", STRLITERALLEN("entry_timeout")) == 0) | |
1290 | continue; | |
1291 | ||
1292 | /* default for LXCFS */ | |
1293 | if (strncmp(token, "attr_timeout", STRLITERALLEN("entry_timeout")) == 0) | |
1294 | continue; | |
1295 | ||
1296 | /* default for LXCFS */ | |
1297 | if (strncmp(token, "allow_other", STRLITERALLEN("allow_other")) == 0) | |
1298 | continue; | |
1299 | ||
1300 | /* default with fuse3 */ | |
1301 | if (strcmp(token, "nonempty") == 0) { | |
cb61c9e1 | 1302 | #if !HAVE_FUSE3 |
482a80d4 | 1303 | nonempty = true; |
64a7d94d | 1304 | #endif |
1305 | continue; | |
1306 | } | |
1307 | ||
1308 | if (append_comma_separate(&new_fuse_opts, token)) { | |
1309 | lxcfs_error("Failed to copy fuse argument \"%s\"", token); | |
1310 | free(dup); | |
1311 | goto out; | |
482a80d4 | 1312 | } |
e190ee91 | 1313 | } |
64a7d94d | 1314 | free(dup); |
e190ee91 | 1315 | } |
b0073134 | 1316 | |
64a7d94d | 1317 | if (append_comma_separate(&new_fuse_opts, "allow_other,entry_timeout=0.5,attr_timeout=0.5")) { |
1318 | lxcfs_error("Failed to copy fuse argument \"allow_other,entry_timeout=0.5,attr_timeout=0.5\""); | |
1319 | goto out; | |
2e9c0b32 | 1320 | } |
23b42f47 | 1321 | |
cb61c9e1 | 1322 | #if !HAVE_FUSE3 |
64a7d94d | 1323 | if (nonempty) { |
1324 | if (append_comma_separate(&new_fuse_opts, "nonempty")) { | |
1325 | lxcfs_error("Failed to copy fuse argument \"nonempty\""); | |
1326 | goto out; | |
1327 | } | |
1328 | } | |
758ad80c | 1329 | |
64a7d94d | 1330 | if (append_comma_separate(&new_fuse_opts, "direct_io")) { |
1331 | lxcfs_error("Failed to copy fuse argument \"nonempty\""); | |
47f5266f | 1332 | goto out; |
8fad16cd | 1333 | } |
64a7d94d | 1334 | #endif |
8a03c08b CB |
1335 | |
1336 | /* | |
1337 | * We can't use default_permissions since we still support systems that | |
1338 | * don't have kernels with cgroup namespace support. On such kernels | |
1339 | * lxcfs will provide a namespaced cgroup view and needs explicit | |
1340 | * access helpers to make that work. | |
1341 | * Another reason that came to me is that we can't or at least | |
1342 | * shouldn't guarantee that we don't need more complicated access | |
1343 | * helpers for proc and sys virtualization in the future. | |
1344 | */ | |
64a7d94d | 1345 | |
1346 | fuse_argv[fuse_argc++] = new_fuse_opts; | |
1347 | fuse_argv[fuse_argc++] = new_argv[0]; | |
1348 | fuse_argv[fuse_argc] = NULL; | |
1349 | ||
64a7d94d | 1350 | do_reload(); |
1351 | if (install_signal_handler(SIGUSR1, sigusr1_reload)) { | |
1352 | lxcfs_error("%s - Failed to install SIGUSR1 signal handler", strerror(errno)); | |
1353 | goto out; | |
1354 | } | |
758ad80c | 1355 | |
e190ee91 | 1356 | if (!pidfile) { |
bae92d21 CB |
1357 | snprintf(pidfile_buf, sizeof(pidfile_buf), "%s/lxcfs.pid", RUNTIME_PATH); |
1358 | pidfile = pidfile_buf; | |
e190ee91 | 1359 | } |
ed5ee4f9 CB |
1360 | |
1361 | pidfile_fd = set_pidfile(pidfile); | |
1362 | if (pidfile_fd < 0) | |
e190ee91 SH |
1363 | goto out; |
1364 | ||
a83618e2 JS |
1365 | if (load_use && start_loadavg() != 0) |
1366 | goto out; | |
6db4f7a3 | 1367 | |
64a7d94d | 1368 | if (!fuse_main(fuse_argc, fuse_argv, &lxcfs_ops, opts)) |
47f5266f | 1369 | ret = EXIT_SUCCESS; |
51c38c8b | 1370 | |
a83618e2 JS |
1371 | if (load_use) |
1372 | stop_loadavg(); | |
237e200e | 1373 | |
c0adec85 | 1374 | out: |
47f5266f CB |
1375 | if (dlopen_handle) |
1376 | dlclose(dlopen_handle); | |
1377 | if (pidfile) | |
1378 | unlink(pidfile); | |
64a7d94d | 1379 | free(new_fuse_opts); |
b58c203b | 1380 | free(opts); |
05b7a16d | 1381 | close_prot_errno_disarm(pidfile_fd); |
47f5266f | 1382 | exit(ret); |
2183082c | 1383 | } |