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Commit | Line | Data |
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576f946d | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
576f946d | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
576f946d | 22 | */ |
d06245b8 NC |
23 | #include "config.h" |
24 | ||
576f946d | 25 | #include <stdio.h> |
576f946d | 26 | #include <stdlib.h> |
27 | #include <errno.h> | |
576f946d | 28 | #include <unistd.h> |
29 | #include <string.h> | |
341a9bd8 | 30 | #include <dirent.h> |
576f946d | 31 | #include <fcntl.h> |
8b276860 | 32 | #include <grp.h> |
b98f7d6e | 33 | #include <ctype.h> |
576f946d | 34 | #include <sys/types.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/param.h> | |
37 | #include <sys/inotify.h> | |
aae1f3c4 | 38 | #include <sys/mount.h> |
576f946d | 39 | #include <netinet/in.h> |
40 | #include <net/if.h> | |
41 | ||
d8e48992 | 42 | #include "bdev.h" |
e2bcd7db | 43 | #include "error.h" |
ae5c8b8e | 44 | #include "commands.h" |
b98f7d6e SH |
45 | #include "list.h" |
46 | #include "conf.h" | |
33ad9f1a | 47 | #include "utils.h" |
f2363e38 ÇO |
48 | #include "log.h" |
49 | #include "cgroup.h" | |
50 | #include "start.h" | |
484ed030 | 51 | #include "state.h" |
36eb9bde | 52 | |
edaf8b1b SG |
53 | #if IS_BIONIC |
54 | #include <../include/lxcmntent.h> | |
55 | #else | |
56 | #include <mntent.h> | |
57 | #endif | |
58 | ||
4fb3cba5 DE |
59 | struct cgroup_hierarchy; |
60 | struct cgroup_meta_data; | |
61 | struct cgroup_mount_point; | |
62 | ||
63 | /* | |
64 | * cgroup_meta_data: the metadata about the cgroup infrastructure on this | |
65 | * host | |
66 | */ | |
67 | struct cgroup_meta_data { | |
68 | ptrdiff_t ref; /* simple refcount */ | |
69 | struct cgroup_hierarchy **hierarchies; | |
70 | struct cgroup_mount_point **mount_points; | |
71 | int maximum_hierarchy; | |
72 | }; | |
73 | ||
74 | /* | |
75 | * cgroup_hierarchy: describes a single cgroup hierarchy | |
76 | * (may have multiple mount points) | |
77 | */ | |
78 | struct cgroup_hierarchy { | |
79 | int index; | |
80 | bool used; /* false if the hierarchy should be ignored by lxc */ | |
81 | char **subsystems; | |
82 | struct cgroup_mount_point *rw_absolute_mount_point; | |
83 | struct cgroup_mount_point *ro_absolute_mount_point; | |
84 | struct cgroup_mount_point **all_mount_points; | |
85 | size_t all_mount_point_capacity; | |
86 | }; | |
87 | ||
88 | /* | |
89 | * cgroup_mount_point: a mount point to where a hierarchy | |
90 | * is mounted to | |
91 | */ | |
92 | struct cgroup_mount_point { | |
93 | struct cgroup_hierarchy *hierarchy; | |
94 | char *mount_point; | |
95 | char *mount_prefix; | |
96 | bool read_only; | |
97 | bool need_cpuset_init; | |
98 | }; | |
99 | ||
100 | /* | |
101 | * cgroup_process_info: describes the membership of a | |
102 | * process to the different cgroup | |
103 | * hierarchies | |
104 | * | |
105 | * Note this is the per-process info tracked by the cgfs_ops. | |
106 | * This is not used with cgmanager. | |
107 | */ | |
108 | struct cgroup_process_info { | |
109 | struct cgroup_process_info *next; | |
110 | struct cgroup_meta_data *meta_ref; | |
111 | struct cgroup_hierarchy *hierarchy; | |
112 | char *cgroup_path; | |
113 | char *cgroup_path_sub; | |
114 | char **created_paths; | |
115 | size_t created_paths_capacity; | |
116 | size_t created_paths_count; | |
117 | struct cgroup_mount_point *designated_mount_point; | |
118 | }; | |
119 | ||
120 | struct cgfs_data { | |
121 | char *name; | |
122 | const char *cgroup_pattern; | |
123 | struct cgroup_meta_data *meta; | |
124 | struct cgroup_process_info *info; | |
125 | }; | |
126 | ||
127 | lxc_log_define(lxc_cgfs, lxc); | |
576f946d | 128 | |
33ad9f1a CS |
129 | static struct cgroup_process_info *lxc_cgroup_process_info_getx(const char *proc_pid_cgroup_str, struct cgroup_meta_data *meta); |
130 | static char **subsystems_from_mount_options(const char *mount_options, char **kernel_list); | |
131 | static void lxc_cgroup_mount_point_free(struct cgroup_mount_point *mp); | |
132 | static void lxc_cgroup_hierarchy_free(struct cgroup_hierarchy *h); | |
133 | static bool is_valid_cgroup(const char *name); | |
33ad9f1a | 134 | static int create_cgroup(struct cgroup_mount_point *mp, const char *path); |
6a9e0f26 SH |
135 | static int remove_cgroup(struct cgroup_mount_point *mp, const char *path, bool recurse, |
136 | struct lxc_conf *conf); | |
33ad9f1a CS |
137 | static char *cgroup_to_absolute_path(struct cgroup_mount_point *mp, const char *path, const char *suffix); |
138 | static struct cgroup_process_info *find_info_for_subsystem(struct cgroup_process_info *info, const char *subsystem); | |
139 | static int do_cgroup_get(const char *cgroup_path, const char *sub_filename, char *value, size_t len); | |
140 | static int do_cgroup_set(const char *cgroup_path, const char *sub_filename, const char *value); | |
4fb3cba5 DE |
141 | static bool cgroup_devices_has_allow_or_deny(struct cgfs_data *d, char *v, bool for_allow); |
142 | static int do_setup_cgroup_limits(struct cgfs_data *d, struct lxc_list *cgroup_settings, bool do_devices); | |
33ad9f1a | 143 | static int cgroup_recursive_task_count(const char *cgroup_path); |
1ea59ad2 | 144 | static int handle_cgroup_settings(struct cgroup_mount_point *mp, char *cgroup_path); |
d703c2b1 | 145 | static bool init_cpuset_if_needed(struct cgroup_mount_point *mp, const char *path); |
33ad9f1a | 146 | |
4fb3cba5 DE |
147 | static struct cgroup_meta_data *lxc_cgroup_load_meta2(const char **subsystem_whitelist); |
148 | static struct cgroup_meta_data *lxc_cgroup_get_meta(struct cgroup_meta_data *meta_data); | |
149 | static struct cgroup_meta_data *lxc_cgroup_put_meta(struct cgroup_meta_data *meta_data); | |
150 | ||
151 | /* free process membership information */ | |
152 | static void lxc_cgroup_process_info_free(struct cgroup_process_info *info); | |
6a9e0f26 SH |
153 | static void lxc_cgroup_process_info_free_and_remove(struct cgroup_process_info *info, |
154 | struct lxc_conf *conf); | |
4fb3cba5 | 155 | |
d4ef7c50 | 156 | static struct cgroup_ops cgfs_ops; |
d4ef7c50 | 157 | |
603c64c2 SH |
158 | static int cgroup_rmdir(char *dirname) |
159 | { | |
74f96976 | 160 | struct dirent *direntp; |
603c64c2 SH |
161 | int saved_errno = 0; |
162 | DIR *dir; | |
163 | int ret, failed=0; | |
164 | char pathname[MAXPATHLEN]; | |
165 | ||
166 | dir = opendir(dirname); | |
167 | if (!dir) { | |
168 | ERROR("%s: failed to open %s", __func__, dirname); | |
169 | return -1; | |
170 | } | |
171 | ||
74f96976 | 172 | while ((direntp = readdir(dir))) { |
603c64c2 SH |
173 | struct stat mystat; |
174 | int rc; | |
175 | ||
176 | if (!direntp) | |
177 | break; | |
178 | ||
179 | if (!strcmp(direntp->d_name, ".") || | |
180 | !strcmp(direntp->d_name, "..")) | |
181 | continue; | |
182 | ||
183 | rc = snprintf(pathname, MAXPATHLEN, "%s/%s", dirname, direntp->d_name); | |
184 | if (rc < 0 || rc >= MAXPATHLEN) { | |
185 | ERROR("pathname too long"); | |
186 | failed=1; | |
187 | if (!saved_errno) | |
188 | saved_errno = -ENOMEM; | |
189 | continue; | |
190 | } | |
191 | ret = lstat(pathname, &mystat); | |
192 | if (ret) { | |
193 | SYSERROR("%s: failed to stat %s", __func__, pathname); | |
194 | failed=1; | |
195 | if (!saved_errno) | |
196 | saved_errno = errno; | |
197 | continue; | |
198 | } | |
199 | if (S_ISDIR(mystat.st_mode)) { | |
200 | if (cgroup_rmdir(pathname) < 0) { | |
201 | if (!saved_errno) | |
202 | saved_errno = errno; | |
203 | failed=1; | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
208 | if (rmdir(dirname) < 0) { | |
209 | SYSERROR("%s: failed to delete %s", __func__, dirname); | |
210 | if (!saved_errno) | |
211 | saved_errno = errno; | |
212 | failed=1; | |
213 | } | |
214 | ||
215 | ret = closedir(dir); | |
216 | if (ret) { | |
217 | SYSERROR("%s: failed to close directory %s", __func__, dirname); | |
218 | if (!saved_errno) | |
219 | saved_errno = errno; | |
220 | failed=1; | |
221 | } | |
222 | ||
223 | errno = saved_errno; | |
224 | return failed ? -1 : 0; | |
225 | } | |
226 | ||
6a9e0f26 SH |
227 | static int rmdir_wrapper(void *data) |
228 | { | |
229 | char *path = data; | |
230 | ||
231 | if (setresgid(0,0,0) < 0) | |
232 | SYSERROR("Failed to setgid to 0"); | |
233 | if (setresuid(0,0,0) < 0) | |
234 | SYSERROR("Failed to setuid to 0"); | |
235 | if (setgroups(0, NULL) < 0) | |
236 | SYSERROR("Failed to clear groups"); | |
237 | ||
238 | return cgroup_rmdir(path); | |
239 | } | |
240 | ||
4fb3cba5 | 241 | static struct cgroup_meta_data *lxc_cgroup_load_meta() |
33ad9f1a CS |
242 | { |
243 | const char *cgroup_use = NULL; | |
244 | char **cgroup_use_list = NULL; | |
245 | struct cgroup_meta_data *md = NULL; | |
246 | int saved_errno; | |
247 | ||
248 | errno = 0; | |
593e8478 | 249 | cgroup_use = lxc_global_config_value("lxc.cgroup.use"); |
33ad9f1a CS |
250 | if (!cgroup_use && errno != 0) |
251 | return NULL; | |
252 | if (cgroup_use) { | |
253 | cgroup_use_list = lxc_string_split_and_trim(cgroup_use, ','); | |
254 | if (!cgroup_use_list) | |
255 | return NULL; | |
256 | } | |
576f946d | 257 | |
33ad9f1a CS |
258 | md = lxc_cgroup_load_meta2((const char **)cgroup_use_list); |
259 | saved_errno = errno; | |
260 | lxc_free_array((void **)cgroup_use_list, free); | |
261 | errno = saved_errno; | |
262 | return md; | |
263 | } | |
fd37327f | 264 | |
b653309a | 265 | /* Step 1: determine all kernel subsystems */ |
4fb3cba5 | 266 | static bool find_cgroup_subsystems(char ***kernel_subsystems) |
1d39a065 | 267 | { |
b653309a SH |
268 | FILE *proc_cgroups; |
269 | bool bret = false; | |
33ad9f1a CS |
270 | char *line = NULL; |
271 | size_t sz = 0; | |
b653309a SH |
272 | size_t kernel_subsystems_count = 0; |
273 | size_t kernel_subsystems_capacity = 0; | |
274 | int r; | |
1d39a065 | 275 | |
33ad9f1a CS |
276 | proc_cgroups = fopen_cloexec("/proc/cgroups", "r"); |
277 | if (!proc_cgroups) | |
b653309a | 278 | return false; |
1d39a065 | 279 | |
33ad9f1a CS |
280 | while (getline(&line, &sz, proc_cgroups) != -1) { |
281 | char *tab1; | |
282 | char *tab2; | |
283 | int hierarchy_number; | |
1d39a065 | 284 | |
33ad9f1a CS |
285 | if (line[0] == '#') |
286 | continue; | |
287 | if (!line[0]) | |
288 | continue; | |
1d39a065 | 289 | |
33ad9f1a CS |
290 | tab1 = strchr(line, '\t'); |
291 | if (!tab1) | |
8900b9eb | 292 | continue; |
33ad9f1a CS |
293 | *tab1++ = '\0'; |
294 | tab2 = strchr(tab1, '\t'); | |
295 | if (!tab2) | |
296 | continue; | |
297 | *tab2 = '\0'; | |
fd37327f | 298 | |
33ad9f1a CS |
299 | tab2 = NULL; |
300 | hierarchy_number = strtoul(tab1, &tab2, 10); | |
301 | if (!tab2 || *tab2) | |
302 | continue; | |
303 | (void)hierarchy_number; | |
304 | ||
b653309a | 305 | r = lxc_grow_array((void ***)kernel_subsystems, &kernel_subsystems_capacity, kernel_subsystems_count + 1, 12); |
33ad9f1a | 306 | if (r < 0) |
b653309a SH |
307 | goto out; |
308 | (*kernel_subsystems)[kernel_subsystems_count] = strdup(line); | |
309 | if (!(*kernel_subsystems)[kernel_subsystems_count]) | |
310 | goto out; | |
33ad9f1a | 311 | kernel_subsystems_count++; |
bcbd102c | 312 | } |
b653309a | 313 | bret = true; |
0d9f8e18 | 314 | |
b653309a | 315 | out: |
33ad9f1a | 316 | fclose(proc_cgroups); |
0ccf7c2a | 317 | free(line); |
b653309a SH |
318 | return bret; |
319 | } | |
320 | ||
321 | /* Step 2: determine all hierarchies (by reading /proc/self/cgroup), | |
322 | * since mount points don't specify hierarchy number and | |
323 | * /proc/cgroups does not contain named hierarchies | |
324 | */ | |
325 | static bool find_cgroup_hierarchies(struct cgroup_meta_data *meta_data, | |
326 | bool all_kernel_subsystems, bool all_named_subsystems, | |
327 | const char **subsystem_whitelist) | |
328 | { | |
329 | FILE *proc_self_cgroup; | |
330 | char *line = NULL; | |
331 | size_t sz = 0; | |
332 | int r; | |
333 | bool bret = false; | |
334 | size_t hierarchy_capacity = 0; | |
ef6e34ee | 335 | |
33ad9f1a CS |
336 | proc_self_cgroup = fopen_cloexec("/proc/self/cgroup", "r"); |
337 | /* if for some reason (because of setns() and pid namespace for example), | |
338 | * /proc/self is not valid, we try /proc/1/cgroup... */ | |
339 | if (!proc_self_cgroup) | |
340 | proc_self_cgroup = fopen_cloexec("/proc/1/cgroup", "r"); | |
341 | if (!proc_self_cgroup) | |
b653309a | 342 | return false; |
33ad9f1a CS |
343 | |
344 | while (getline(&line, &sz, proc_self_cgroup) != -1) { | |
345 | /* file format: hierarchy:subsystems:group, | |
346 | * we only extract hierarchy and subsystems | |
347 | * here */ | |
348 | char *colon1; | |
349 | char *colon2; | |
350 | int hierarchy_number; | |
351 | struct cgroup_hierarchy *h = NULL; | |
352 | char **p; | |
353 | ||
354 | if (!line[0]) | |
355 | continue; | |
ad08bbb7 | 356 | |
33ad9f1a CS |
357 | colon1 = strchr(line, ':'); |
358 | if (!colon1) | |
8900b9eb | 359 | continue; |
33ad9f1a CS |
360 | *colon1++ = '\0'; |
361 | colon2 = strchr(colon1, ':'); | |
362 | if (!colon2) | |
363 | continue; | |
364 | *colon2 = '\0'; | |
ad08bbb7 | 365 | |
33ad9f1a CS |
366 | colon2 = NULL; |
367 | hierarchy_number = strtoul(line, &colon2, 10); | |
368 | if (!colon2 || *colon2) | |
369 | continue; | |
576f946d | 370 | |
33ad9f1a CS |
371 | if (hierarchy_number > meta_data->maximum_hierarchy) { |
372 | /* lxc_grow_array will never shrink, so even if we find a lower | |
373 | * hierarchy number here, the array will never be smaller | |
374 | */ | |
375 | r = lxc_grow_array((void ***)&meta_data->hierarchies, &hierarchy_capacity, hierarchy_number + 1, 12); | |
376 | if (r < 0) | |
b653309a | 377 | goto out; |
5193cc3d | 378 | |
33ad9f1a CS |
379 | meta_data->maximum_hierarchy = hierarchy_number; |
380 | } | |
fd37327f | 381 | |
33ad9f1a CS |
382 | /* this shouldn't happen, we had this already */ |
383 | if (meta_data->hierarchies[hierarchy_number]) | |
b653309a | 384 | goto out; |
33ad9f1a CS |
385 | |
386 | h = calloc(1, sizeof(struct cgroup_hierarchy)); | |
387 | if (!h) | |
b653309a | 388 | goto out; |
33ad9f1a CS |
389 | |
390 | meta_data->hierarchies[hierarchy_number] = h; | |
391 | ||
392 | h->index = hierarchy_number; | |
393 | h->subsystems = lxc_string_split_and_trim(colon1, ','); | |
394 | if (!h->subsystems) | |
b653309a | 395 | goto out; |
33ad9f1a CS |
396 | /* see if this hierarchy should be considered */ |
397 | if (!all_kernel_subsystems || !all_named_subsystems) { | |
398 | for (p = h->subsystems; *p; p++) { | |
399 | if (!strncmp(*p, "name=", 5)) { | |
400 | if (all_named_subsystems || (subsystem_whitelist && lxc_string_in_array(*p, subsystem_whitelist))) { | |
401 | h->used = true; | |
402 | break; | |
403 | } | |
404 | } else { | |
405 | if (all_kernel_subsystems || (subsystem_whitelist && lxc_string_in_array(*p, subsystem_whitelist))) { | |
406 | h->used = true; | |
407 | break; | |
408 | } | |
409 | } | |
410 | } | |
411 | } else { | |
412 | /* we want all hierarchy anyway */ | |
413 | h->used = true; | |
ae5c8b8e | 414 | } |
ae5c8b8e | 415 | } |
b653309a | 416 | bret = true; |
0b9c21ab | 417 | |
b653309a | 418 | out: |
33ad9f1a | 419 | fclose(proc_self_cgroup); |
0ccf7c2a | 420 | free(line); |
b653309a SH |
421 | return bret; |
422 | } | |
423 | ||
424 | /* Step 3: determine all mount points of each hierarchy */ | |
425 | static bool find_hierarchy_mountpts( struct cgroup_meta_data *meta_data, char **kernel_subsystems) | |
426 | { | |
427 | bool bret = false; | |
428 | FILE *proc_self_mountinfo; | |
429 | char *line = NULL; | |
430 | size_t sz = 0; | |
431 | char **tokens = NULL; | |
432 | size_t mount_point_count = 0; | |
433 | size_t mount_point_capacity = 0; | |
434 | size_t token_capacity = 0; | |
435 | int r; | |
fcca16bc | 436 | bool is_cgns = cgns_supported(); |
b653309a | 437 | |
33ad9f1a CS |
438 | proc_self_mountinfo = fopen_cloexec("/proc/self/mountinfo", "r"); |
439 | /* if for some reason (because of setns() and pid namespace for example), | |
440 | * /proc/self is not valid, we try /proc/1/cgroup... */ | |
441 | if (!proc_self_mountinfo) | |
442 | proc_self_mountinfo = fopen_cloexec("/proc/1/mountinfo", "r"); | |
443 | if (!proc_self_mountinfo) | |
b653309a | 444 | return false; |
33ad9f1a CS |
445 | |
446 | while (getline(&line, &sz, proc_self_mountinfo) != -1) { | |
178938fe | 447 | char *token, *line_tok, *saveptr = NULL; |
33ad9f1a CS |
448 | size_t i, j, k; |
449 | struct cgroup_mount_point *mount_point; | |
450 | struct cgroup_hierarchy *h; | |
451 | char **subsystems; | |
836514a8 | 452 | bool is_lxcfs = false; |
33ad9f1a CS |
453 | |
454 | if (line[0] && line[strlen(line) - 1] == '\n') | |
455 | line[strlen(line) - 1] = '\0'; | |
456 | ||
178938fe | 457 | for (i = 0, line_tok = line; (token = strtok_r(line_tok, " ", &saveptr)); line_tok = NULL) { |
33ad9f1a CS |
458 | r = lxc_grow_array((void ***)&tokens, &token_capacity, i + 1, 64); |
459 | if (r < 0) | |
b653309a | 460 | goto out; |
33ad9f1a CS |
461 | tokens[i++] = token; |
462 | } | |
b98f7d6e | 463 | |
33ad9f1a CS |
464 | /* layout of /proc/self/mountinfo: |
465 | * 0: id | |
466 | * 1: parent id | |
467 | * 2: device major:minor | |
468 | * 3: mount prefix | |
8900b9eb | 469 | * 4: mount point |
33ad9f1a CS |
470 | * 5: per-mount options |
471 | * [optional X]: additional data | |
472 | * X+7: "-" | |
473 | * X+8: type | |
474 | * X+9: source | |
475 | * X+10: per-superblock options | |
476 | */ | |
477 | for (j = 6; j < i && tokens[j]; j++) | |
478 | if (!strcmp(tokens[j], "-")) | |
479 | break; | |
fd4f5a56 | 480 | |
33ad9f1a CS |
481 | /* could not find separator */ |
482 | if (j >= i || !tokens[j]) | |
483 | continue; | |
484 | /* there should be exactly three fields after | |
485 | * the separator | |
486 | */ | |
487 | if (i != j + 4) | |
488 | continue; | |
fd4f5a56 | 489 | |
33ad9f1a | 490 | /* not a cgroup filesystem */ |
836514a8 U |
491 | if (strcmp(tokens[j + 1], "cgroup") != 0) { |
492 | if (strcmp(tokens[j + 1], "fuse.lxcfs") != 0) | |
493 | continue; | |
494 | if (strncmp(tokens[4], "/sys/fs/cgroup/", 15) != 0) | |
495 | continue; | |
496 | is_lxcfs = true; | |
497 | char *curtok = tokens[4] + 15; | |
498 | subsystems = subsystems_from_mount_options(curtok, | |
499 | kernel_subsystems); | |
500 | } else | |
501 | subsystems = subsystems_from_mount_options(tokens[j + 3], | |
502 | kernel_subsystems); | |
33ad9f1a | 503 | if (!subsystems) |
b653309a | 504 | goto out; |
33ad9f1a CS |
505 | |
506 | h = NULL; | |
507 | for (k = 1; k <= meta_data->maximum_hierarchy; k++) { | |
508 | if (meta_data->hierarchies[k] && | |
509 | meta_data->hierarchies[k]->subsystems[0] && | |
510 | lxc_string_in_array(meta_data->hierarchies[k]->subsystems[0], (const char **)subsystems)) { | |
511 | /* TODO: we could also check if the lists really match completely, | |
512 | * just to have an additional sanity check */ | |
513 | h = meta_data->hierarchies[k]; | |
b98f7d6e | 514 | break; |
33ad9f1a | 515 | } |
b98f7d6e | 516 | } |
33ad9f1a CS |
517 | lxc_free_array((void **)subsystems, free); |
518 | ||
519 | r = lxc_grow_array((void ***)&meta_data->mount_points, &mount_point_capacity, mount_point_count + 1, 12); | |
520 | if (r < 0) | |
b653309a | 521 | goto out; |
33ad9f1a CS |
522 | |
523 | /* create mount point object */ | |
524 | mount_point = calloc(1, sizeof(*mount_point)); | |
525 | if (!mount_point) | |
b653309a | 526 | goto out; |
33ad9f1a CS |
527 | |
528 | meta_data->mount_points[mount_point_count++] = mount_point; | |
529 | ||
530 | mount_point->hierarchy = h; | |
fcca16bc | 531 | if (is_lxcfs || is_cgns) |
836514a8 U |
532 | mount_point->mount_prefix = strdup("/"); |
533 | else | |
534 | mount_point->mount_prefix = strdup(tokens[3]); | |
33ad9f1a | 535 | mount_point->mount_point = strdup(tokens[4]); |
33ad9f1a | 536 | if (!mount_point->mount_point || !mount_point->mount_prefix) |
b653309a | 537 | goto out; |
33ad9f1a CS |
538 | mount_point->read_only = !lxc_string_in_list("rw", tokens[5], ','); |
539 | ||
540 | if (!strcmp(mount_point->mount_prefix, "/")) { | |
541 | if (mount_point->read_only) { | |
542 | if (!h->ro_absolute_mount_point) | |
543 | h->ro_absolute_mount_point = mount_point; | |
544 | } else { | |
545 | if (!h->rw_absolute_mount_point) | |
546 | h->rw_absolute_mount_point = mount_point; | |
547 | } | |
b98f7d6e | 548 | } |
ae5c8b8e | 549 | |
33ad9f1a CS |
550 | k = lxc_array_len((void **)h->all_mount_points); |
551 | r = lxc_grow_array((void ***)&h->all_mount_points, &h->all_mount_point_capacity, k + 1, 4); | |
552 | if (r < 0) | |
b653309a | 553 | goto out; |
33ad9f1a | 554 | h->all_mount_points[k] = mount_point; |
fd4f5a56 | 555 | } |
b653309a SH |
556 | bret = true; |
557 | ||
558 | out: | |
b653309a | 559 | fclose(proc_self_mountinfo); |
b653309a | 560 | free(tokens); |
2cdafc54 | 561 | free(line); |
b653309a SH |
562 | return bret; |
563 | } | |
564 | ||
4fb3cba5 | 565 | static struct cgroup_meta_data *lxc_cgroup_load_meta2(const char **subsystem_whitelist) |
b653309a SH |
566 | { |
567 | bool all_kernel_subsystems = true; | |
568 | bool all_named_subsystems = false; | |
569 | struct cgroup_meta_data *meta_data = NULL; | |
570 | char **kernel_subsystems = NULL; | |
571 | int saved_errno = 0; | |
572 | ||
573 | /* if the subsystem whitelist is not specified, include all | |
574 | * hierarchies that contain kernel subsystems by default but | |
575 | * no hierarchies that only contain named subsystems | |
576 | * | |
577 | * if it is specified, the specifier @all will select all | |
578 | * hierarchies, @kernel will select all hierarchies with | |
579 | * kernel subsystems and @named will select all named | |
580 | * hierarchies | |
581 | */ | |
582 | all_kernel_subsystems = subsystem_whitelist ? | |
583 | (lxc_string_in_array("@kernel", subsystem_whitelist) || lxc_string_in_array("@all", subsystem_whitelist)) : | |
584 | true; | |
585 | all_named_subsystems = subsystem_whitelist ? | |
586 | (lxc_string_in_array("@named", subsystem_whitelist) || lxc_string_in_array("@all", subsystem_whitelist)) : | |
79c59e6b | 587 | true; |
b653309a SH |
588 | |
589 | meta_data = calloc(1, sizeof(struct cgroup_meta_data)); | |
590 | if (!meta_data) | |
591 | return NULL; | |
592 | meta_data->ref = 1; | |
593 | ||
594 | if (!find_cgroup_subsystems(&kernel_subsystems)) | |
595 | goto out_error; | |
596 | ||
597 | if (!find_cgroup_hierarchies(meta_data, all_kernel_subsystems, | |
598 | all_named_subsystems, subsystem_whitelist)) | |
599 | goto out_error; | |
600 | ||
601 | if (!find_hierarchy_mountpts(meta_data, kernel_subsystems)) | |
602 | goto out_error; | |
fd4f5a56 | 603 | |
33ad9f1a CS |
604 | /* oops, we couldn't find anything */ |
605 | if (!meta_data->hierarchies || !meta_data->mount_points) { | |
606 | errno = EINVAL; | |
607 | goto out_error; | |
ae5c8b8e | 608 | } |
fd4f5a56 | 609 | |
3a0abb3a | 610 | lxc_free_array((void **)kernel_subsystems, free); |
33ad9f1a CS |
611 | return meta_data; |
612 | ||
613 | out_error: | |
614 | saved_errno = errno; | |
33ad9f1a CS |
615 | lxc_free_array((void **)kernel_subsystems, free); |
616 | lxc_cgroup_put_meta(meta_data); | |
617 | errno = saved_errno; | |
618 | return NULL; | |
fd4f5a56 DL |
619 | } |
620 | ||
4fb3cba5 | 621 | static struct cgroup_meta_data *lxc_cgroup_get_meta(struct cgroup_meta_data *meta_data) |
e14f67a7 | 622 | { |
33ad9f1a CS |
623 | meta_data->ref++; |
624 | return meta_data; | |
625 | } | |
e14f67a7 | 626 | |
4fb3cba5 | 627 | static struct cgroup_meta_data *lxc_cgroup_put_meta(struct cgroup_meta_data *meta_data) |
33ad9f1a CS |
628 | { |
629 | size_t i; | |
630 | if (!meta_data) | |
631 | return NULL; | |
632 | if (--meta_data->ref > 0) | |
633 | return meta_data; | |
634 | lxc_free_array((void **)meta_data->mount_points, (lxc_free_fn)lxc_cgroup_mount_point_free); | |
2446c321 | 635 | if (meta_data->hierarchies) |
33ad9f1a | 636 | for (i = 0; i <= meta_data->maximum_hierarchy; i++) |
2446c321 CB |
637 | if (meta_data->hierarchies[i]) |
638 | lxc_cgroup_hierarchy_free(meta_data->hierarchies[i]); | |
33ad9f1a | 639 | free(meta_data->hierarchies); |
178938fe | 640 | free(meta_data); |
33ad9f1a | 641 | return NULL; |
e14f67a7 U |
642 | } |
643 | ||
4fb3cba5 | 644 | static struct cgroup_hierarchy *lxc_cgroup_find_hierarchy(struct cgroup_meta_data *meta_data, const char *subsystem) |
e14f67a7 | 645 | { |
33ad9f1a CS |
646 | size_t i; |
647 | for (i = 0; i <= meta_data->maximum_hierarchy; i++) { | |
648 | struct cgroup_hierarchy *h = meta_data->hierarchies[i]; | |
649 | if (h && lxc_string_in_array(subsystem, (const char **)h->subsystems)) | |
650 | return h; | |
e14f67a7 | 651 | } |
e14f67a7 U |
652 | return NULL; |
653 | } | |
654 | ||
d3f99e96 SH |
655 | static bool mountpoint_is_accessible(struct cgroup_mount_point *mp) |
656 | { | |
657 | return mp && access(mp->mount_point, F_OK) == 0; | |
658 | } | |
659 | ||
4fb3cba5 | 660 | static struct cgroup_mount_point *lxc_cgroup_find_mount_point(struct cgroup_hierarchy *hierarchy, const char *group, bool should_be_writable) |
b98f7d6e | 661 | { |
33ad9f1a CS |
662 | struct cgroup_mount_point **mps; |
663 | struct cgroup_mount_point *current_result = NULL; | |
664 | ssize_t quality = -1; | |
b98f7d6e | 665 | |
33ad9f1a | 666 | /* trivial case */ |
d3f99e96 | 667 | if (mountpoint_is_accessible(hierarchy->rw_absolute_mount_point)) |
33ad9f1a | 668 | return hierarchy->rw_absolute_mount_point; |
d3f99e96 | 669 | if (!should_be_writable && mountpoint_is_accessible(hierarchy->ro_absolute_mount_point)) |
33ad9f1a | 670 | return hierarchy->ro_absolute_mount_point; |
b98f7d6e | 671 | |
33ad9f1a CS |
672 | for (mps = hierarchy->all_mount_points; mps && *mps; mps++) { |
673 | struct cgroup_mount_point *mp = *mps; | |
674 | size_t prefix_len = mp->mount_prefix ? strlen(mp->mount_prefix) : 0; | |
b98f7d6e | 675 | |
33ad9f1a CS |
676 | if (prefix_len == 1 && mp->mount_prefix[0] == '/') |
677 | prefix_len = 0; | |
b98f7d6e | 678 | |
d3f99e96 SH |
679 | if (!mountpoint_is_accessible(mp)) |
680 | continue; | |
681 | ||
33ad9f1a CS |
682 | if (should_be_writable && mp->read_only) |
683 | continue; | |
684 | ||
685 | if (!prefix_len || | |
686 | (strncmp(group, mp->mount_prefix, prefix_len) == 0 && | |
687 | (group[prefix_len] == '\0' || group[prefix_len] == '/'))) { | |
688 | /* search for the best quality match, i.e. the match with the | |
689 | * shortest prefix where this group is still contained | |
690 | */ | |
691 | if (quality == -1 || prefix_len < quality) { | |
692 | current_result = mp; | |
693 | quality = prefix_len; | |
694 | } | |
b98f7d6e SH |
695 | } |
696 | } | |
697 | ||
33ad9f1a CS |
698 | if (!current_result) |
699 | errno = ENOENT; | |
700 | return current_result; | |
b98f7d6e SH |
701 | } |
702 | ||
4fb3cba5 | 703 | static char *lxc_cgroup_find_abs_path(const char *subsystem, const char *group, bool should_be_writable, const char *suffix) |
b98f7d6e | 704 | { |
33ad9f1a CS |
705 | struct cgroup_meta_data *meta_data; |
706 | struct cgroup_hierarchy *h; | |
707 | struct cgroup_mount_point *mp; | |
708 | char *result; | |
709 | int saved_errno; | |
710 | ||
711 | meta_data = lxc_cgroup_load_meta(); | |
712 | if (!meta_data) | |
713 | return NULL; | |
b98f7d6e | 714 | |
33ad9f1a CS |
715 | h = lxc_cgroup_find_hierarchy(meta_data, subsystem); |
716 | if (!h) | |
717 | goto out_error; | |
b98f7d6e | 718 | |
33ad9f1a CS |
719 | mp = lxc_cgroup_find_mount_point(h, group, should_be_writable); |
720 | if (!mp) | |
721 | goto out_error; | |
b98f7d6e | 722 | |
33ad9f1a CS |
723 | result = cgroup_to_absolute_path(mp, group, suffix); |
724 | if (!result) | |
725 | goto out_error; | |
b98f7d6e | 726 | |
33ad9f1a CS |
727 | lxc_cgroup_put_meta(meta_data); |
728 | return result; | |
b98f7d6e | 729 | |
33ad9f1a CS |
730 | out_error: |
731 | saved_errno = errno; | |
732 | lxc_cgroup_put_meta(meta_data); | |
733 | errno = saved_errno; | |
734 | return NULL; | |
b98f7d6e SH |
735 | } |
736 | ||
4fb3cba5 | 737 | static struct cgroup_process_info *lxc_cgroup_process_info_get(pid_t pid, struct cgroup_meta_data *meta) |
fd4f5a56 | 738 | { |
33ad9f1a CS |
739 | char pid_buf[32]; |
740 | snprintf(pid_buf, 32, "/proc/%lu/cgroup", (unsigned long)pid); | |
741 | return lxc_cgroup_process_info_getx(pid_buf, meta); | |
c8f7c563 CS |
742 | } |
743 | ||
4fb3cba5 | 744 | static struct cgroup_process_info *lxc_cgroup_process_info_get_init(struct cgroup_meta_data *meta) |
c8f7c563 | 745 | { |
33ad9f1a CS |
746 | return lxc_cgroup_process_info_get(1, meta); |
747 | } | |
b98f7d6e | 748 | |
4fb3cba5 | 749 | static struct cgroup_process_info *lxc_cgroup_process_info_get_self(struct cgroup_meta_data *meta) |
33ad9f1a CS |
750 | { |
751 | struct cgroup_process_info *i; | |
752 | i = lxc_cgroup_process_info_getx("/proc/self/cgroup", meta); | |
753 | if (!i) | |
754 | i = lxc_cgroup_process_info_get(getpid(), meta); | |
755 | return i; | |
756 | } | |
ae5c8b8e | 757 | |
692ba18f SH |
758 | /* |
759 | * If a controller has ns cgroup mounted, then in that cgroup the handler->pid | |
760 | * is already in a new cgroup named after the pid. 'mnt' is passed in as | |
761 | * the full current cgroup. Say that is /sys/fs/cgroup/lxc/2975 and the container | |
762 | * name is c1. . We want to rename the cgroup directory to /sys/fs/cgroup/lxc/c1, | |
763 | * and return the string /sys/fs/cgroup/lxc/c1. | |
764 | */ | |
cea0552e | 765 | static char *cgroup_rename_nsgroup(const char *mountpath, const char *oldname, pid_t pid, const char *name) |
692ba18f SH |
766 | { |
767 | char *dir, *fulloldpath; | |
768 | char *newname, *fullnewpath; | |
cea0552e | 769 | int len, newlen, ret; |
692ba18f SH |
770 | |
771 | /* | |
772 | * if cgroup is mounted at /cgroup and task is in cgroup /ab/, pid 2375 and | |
773 | * name is c1, | |
774 | * dir: /ab | |
775 | * fulloldpath = /cgroup/ab/2375 | |
776 | * fullnewpath = /cgroup/ab/c1 | |
777 | * newname = /ab/c1 | |
778 | */ | |
779 | dir = alloca(strlen(oldname) + 1); | |
780 | strcpy(dir, oldname); | |
781 | ||
cea0552e SH |
782 | len = strlen(oldname) + strlen(mountpath) + 22; |
783 | fulloldpath = alloca(len); | |
784 | ret = snprintf(fulloldpath, len, "%s/%s/%ld", mountpath, oldname, (unsigned long)pid); | |
785 | if (ret < 0 || ret >= len) | |
786 | return NULL; | |
692ba18f SH |
787 | |
788 | len = strlen(dir) + strlen(name) + 2; | |
789 | newname = malloc(len); | |
790 | if (!newname) { | |
791 | SYSERROR("Out of memory"); | |
792 | return NULL; | |
793 | } | |
cea0552e SH |
794 | ret = snprintf(newname, len, "%s/%s", dir, name); |
795 | if (ret < 0 || ret >= len) { | |
796 | free(newname); | |
797 | return NULL; | |
798 | } | |
692ba18f | 799 | |
cea0552e SH |
800 | newlen = strlen(mountpath) + len + 2; |
801 | fullnewpath = alloca(newlen); | |
802 | ret = snprintf(fullnewpath, newlen, "%s/%s", mountpath, newname); | |
803 | if (ret < 0 || ret >= newlen) { | |
804 | free(newname); | |
805 | return NULL; | |
806 | } | |
692ba18f SH |
807 | |
808 | if (access(fullnewpath, F_OK) == 0) { | |
809 | if (rmdir(fullnewpath) != 0) { | |
810 | SYSERROR("container cgroup %s already exists.", fullnewpath); | |
811 | free(newname); | |
812 | return NULL; | |
813 | } | |
814 | } | |
815 | if (rename(fulloldpath, fullnewpath)) { | |
816 | SYSERROR("failed to rename cgroup %s->%s", fulloldpath, fullnewpath); | |
817 | free(newname); | |
818 | return NULL; | |
819 | } | |
820 | ||
821 | DEBUG("'%s' renamed to '%s'", oldname, newname); | |
822 | ||
823 | return newname; | |
824 | } | |
825 | ||
ea439aac SH |
826 | static bool is_crucial_hierarchy(struct cgroup_hierarchy *h) |
827 | { | |
828 | char **p; | |
829 | ||
830 | for (p = h->subsystems; *p; p++) { | |
831 | if (is_crucial_cgroup_subsystem(*p)) | |
832 | return true; | |
833 | } | |
834 | return false; | |
835 | } | |
836 | ||
33ad9f1a | 837 | /* create a new cgroup */ |
4fb3cba5 | 838 | static struct cgroup_process_info *lxc_cgroupfs_create(const char *name, const char *path_pattern, struct cgroup_meta_data *meta_data, const char *sub_pattern) |
33ad9f1a | 839 | { |
001b026e | 840 | char **cgroup_path_components = NULL; |
33ad9f1a CS |
841 | char **p = NULL; |
842 | char *path_so_far = NULL; | |
843 | char **new_cgroup_paths = NULL; | |
844 | char **new_cgroup_paths_sub = NULL; | |
845 | struct cgroup_mount_point *mp; | |
846 | struct cgroup_hierarchy *h; | |
847 | struct cgroup_process_info *base_info = NULL; | |
848 | struct cgroup_process_info *info_ptr; | |
849 | int saved_errno; | |
850 | int r; | |
851 | unsigned suffix = 0; | |
852 | bool had_sub_pattern = false; | |
853 | size_t i; | |
ae5c8b8e | 854 | |
33ad9f1a CS |
855 | if (!is_valid_cgroup(name)) { |
856 | ERROR("Invalid cgroup name: '%s'", name); | |
857 | errno = EINVAL; | |
858 | return NULL; | |
ae5c8b8e SH |
859 | } |
860 | ||
33ad9f1a CS |
861 | if (!strstr(path_pattern, "%n")) { |
862 | ERROR("Invalid cgroup path pattern: '%s'; contains no %%n for specifying container name", path_pattern); | |
863 | errno = EINVAL; | |
864 | return NULL; | |
865 | } | |
fd37327f | 866 | |
33ad9f1a CS |
867 | /* we will modify the result of this operation directly, |
868 | * so we don't have to copy the data structure | |
869 | */ | |
870 | base_info = (path_pattern[0] == '/') ? | |
871 | lxc_cgroup_process_info_get_init(meta_data) : | |
872 | lxc_cgroup_process_info_get_self(meta_data); | |
873 | if (!base_info) | |
874 | return NULL; | |
c8f7c563 | 875 | |
33ad9f1a CS |
876 | new_cgroup_paths = calloc(meta_data->maximum_hierarchy + 1, sizeof(char *)); |
877 | if (!new_cgroup_paths) | |
878 | goto out_initial_error; | |
879 | ||
880 | new_cgroup_paths_sub = calloc(meta_data->maximum_hierarchy + 1, sizeof(char *)); | |
881 | if (!new_cgroup_paths_sub) | |
882 | goto out_initial_error; | |
883 | ||
884 | /* find mount points we can use */ | |
885 | for (info_ptr = base_info; info_ptr; info_ptr = info_ptr->next) { | |
886 | h = info_ptr->hierarchy; | |
887 | mp = lxc_cgroup_find_mount_point(h, info_ptr->cgroup_path, true); | |
888 | if (!mp) { | |
889 | ERROR("Could not find writable mount point for cgroup hierarchy %d while trying to create cgroup.", h->index); | |
890 | goto out_initial_error; | |
891 | } | |
892 | info_ptr->designated_mount_point = mp; | |
460a1cf0 | 893 | |
692ba18f SH |
894 | if (lxc_string_in_array("ns", (const char **)h->subsystems)) |
895 | continue; | |
2edb53c7 SH |
896 | if (handle_cgroup_settings(mp, info_ptr->cgroup_path) < 0) { |
897 | ERROR("Could not set clone_children to 1 for cpuset hierarchy in parent cgroup."); | |
33ad9f1a | 898 | goto out_initial_error; |
2edb53c7 | 899 | } |
33ad9f1a | 900 | } |
b98f7d6e | 901 | |
33ad9f1a CS |
902 | /* normalize the path */ |
903 | cgroup_path_components = lxc_normalize_path(path_pattern); | |
904 | if (!cgroup_path_components) | |
905 | goto out_initial_error; | |
906 | ||
907 | /* go through the path components to see if we can create them */ | |
908 | for (p = cgroup_path_components; *p || (sub_pattern && !had_sub_pattern); p++) { | |
909 | /* we only want to create the same component with -1, -2, etc. | |
910 | * if the component contains the container name itself, otherwise | |
911 | * it's not an error if it already exists | |
912 | */ | |
913 | char *p_eff = *p ? *p : (char *)sub_pattern; | |
914 | bool contains_name = strstr(p_eff, "%n"); | |
915 | char *current_component = NULL; | |
916 | char *current_subpath = NULL; | |
917 | char *current_entire_path = NULL; | |
918 | char *parts[3]; | |
919 | size_t j = 0; | |
920 | i = 0; | |
921 | ||
922 | /* if we are processing the subpattern, we want to make sure | |
923 | * loop is ended the next time around | |
924 | */ | |
925 | if (!*p) { | |
926 | had_sub_pattern = true; | |
927 | p--; | |
928 | } | |
b98f7d6e | 929 | |
33ad9f1a | 930 | goto find_name_on_this_level; |
4fb3cba5 | 931 | |
33ad9f1a CS |
932 | cleanup_name_on_this_level: |
933 | /* This is reached if we found a name clash. | |
934 | * In that case, remove the cgroup from all previous hierarchies | |
935 | */ | |
936 | for (j = 0, info_ptr = base_info; j < i && info_ptr; info_ptr = info_ptr->next, j++) { | |
77afbedf SH |
937 | if (info_ptr->created_paths_count < 1) |
938 | continue; | |
6a9e0f26 | 939 | r = remove_cgroup(info_ptr->designated_mount_point, info_ptr->created_paths[info_ptr->created_paths_count - 1], false, NULL); |
33ad9f1a CS |
940 | if (r < 0) |
941 | WARN("could not clean up cgroup we created when trying to create container"); | |
942 | free(info_ptr->created_paths[info_ptr->created_paths_count - 1]); | |
943 | info_ptr->created_paths[--info_ptr->created_paths_count] = NULL; | |
944 | } | |
945 | if (current_component != current_subpath) | |
946 | free(current_subpath); | |
947 | if (current_component != p_eff) | |
948 | free(current_component); | |
949 | current_component = current_subpath = NULL; | |
950 | /* try again with another suffix */ | |
951 | ++suffix; | |
4fb3cba5 | 952 | |
33ad9f1a CS |
953 | find_name_on_this_level: |
954 | /* determine name of the path component we should create */ | |
955 | if (contains_name && suffix > 0) { | |
956 | char *buf = calloc(strlen(name) + 32, 1); | |
957 | if (!buf) | |
958 | goto out_initial_error; | |
959 | snprintf(buf, strlen(name) + 32, "%s-%u", name, suffix); | |
960 | current_component = lxc_string_replace("%n", buf, p_eff); | |
961 | free(buf); | |
962 | } else { | |
963 | current_component = contains_name ? lxc_string_replace("%n", name, p_eff) : p_eff; | |
964 | } | |
965 | parts[0] = path_so_far; | |
966 | parts[1] = current_component; | |
967 | parts[2] = NULL; | |
968 | current_subpath = path_so_far ? lxc_string_join("/", (const char **)parts, false) : current_component; | |
969 | ||
970 | /* Now go through each hierarchy and try to create the | |
971 | * corresponding cgroup | |
972 | */ | |
973 | for (i = 0, info_ptr = base_info; info_ptr; info_ptr = info_ptr->next, i++) { | |
974 | char *parts2[3]; | |
692ba18f SH |
975 | |
976 | if (lxc_string_in_array("ns", (const char **)info_ptr->hierarchy->subsystems)) | |
977 | continue; | |
33ad9f1a CS |
978 | current_entire_path = NULL; |
979 | ||
980 | parts2[0] = !strcmp(info_ptr->cgroup_path, "/") ? "" : info_ptr->cgroup_path; | |
981 | parts2[1] = current_subpath; | |
982 | parts2[2] = NULL; | |
983 | current_entire_path = lxc_string_join("/", (const char **)parts2, false); | |
984 | ||
985 | if (!*p) { | |
986 | /* we are processing the subpath, so only update that one */ | |
987 | free(new_cgroup_paths_sub[i]); | |
988 | new_cgroup_paths_sub[i] = strdup(current_entire_path); | |
989 | if (!new_cgroup_paths_sub[i]) | |
990 | goto cleanup_from_error; | |
991 | } else { | |
992 | /* remember which path was used on this controller */ | |
993 | free(new_cgroup_paths[i]); | |
994 | new_cgroup_paths[i] = strdup(current_entire_path); | |
995 | if (!new_cgroup_paths[i]) | |
996 | goto cleanup_from_error; | |
997 | } | |
fd4f5a56 | 998 | |
33ad9f1a CS |
999 | r = create_cgroup(info_ptr->designated_mount_point, current_entire_path); |
1000 | if (r < 0 && errno == EEXIST && contains_name) { | |
1001 | /* name clash => try new name with new suffix */ | |
1002 | free(current_entire_path); | |
1003 | current_entire_path = NULL; | |
1004 | goto cleanup_name_on_this_level; | |
1005 | } else if (r < 0 && errno != EEXIST) { | |
ea439aac SH |
1006 | if (is_crucial_hierarchy(info_ptr->hierarchy)) { |
1007 | SYSERROR("Could not create cgroup '%s' in '%s'.", current_entire_path, info_ptr->designated_mount_point->mount_point); | |
1008 | goto cleanup_from_error; | |
1009 | } | |
1010 | goto skip; | |
33ad9f1a CS |
1011 | } else if (r == 0) { |
1012 | /* successfully created */ | |
1013 | r = lxc_grow_array((void ***)&info_ptr->created_paths, &info_ptr->created_paths_capacity, info_ptr->created_paths_count + 1, 8); | |
1014 | if (r < 0) | |
1015 | goto cleanup_from_error; | |
d703c2b1 | 1016 | if (!init_cpuset_if_needed(info_ptr->designated_mount_point, current_entire_path)) { |
b38b62a6 | 1017 | ERROR("Failed to initialize cpuset for '%s' in '%s'.", current_entire_path, info_ptr->designated_mount_point->mount_point); |
d703c2b1 RV |
1018 | goto cleanup_from_error; |
1019 | } | |
33ad9f1a CS |
1020 | info_ptr->created_paths[info_ptr->created_paths_count++] = current_entire_path; |
1021 | } else { | |
1022 | /* if we didn't create the cgroup, then we have to make sure that | |
1023 | * further cgroups will be created properly | |
1024 | */ | |
d703c2b1 | 1025 | if (handle_cgroup_settings(info_ptr->designated_mount_point, info_ptr->cgroup_path) < 0) { |
f6ac3b9e | 1026 | ERROR("Could not set clone_children to 1 for cpuset hierarchy in pre-existing cgroup."); |
33ad9f1a | 1027 | goto cleanup_from_error; |
f6ac3b9e | 1028 | } |
d703c2b1 RV |
1029 | if (!init_cpuset_if_needed(info_ptr->designated_mount_point, info_ptr->cgroup_path)) { |
1030 | ERROR("Failed to initialize cpuset in pre-existing '%s'.", info_ptr->cgroup_path); | |
1031 | goto cleanup_from_error; | |
1032 | } | |
33ad9f1a | 1033 | |
ea439aac | 1034 | skip: |
33ad9f1a CS |
1035 | /* already existed but path component of pattern didn't contain '%n', |
1036 | * so this is not an error; but then we don't need current_entire_path | |
1037 | * anymore... | |
1038 | */ | |
1039 | free(current_entire_path); | |
1040 | current_entire_path = NULL; | |
1041 | } | |
1042 | } | |
fd4f5a56 | 1043 | |
33ad9f1a CS |
1044 | /* save path so far */ |
1045 | free(path_so_far); | |
1046 | path_so_far = strdup(current_subpath); | |
1047 | if (!path_so_far) | |
1048 | goto cleanup_from_error; | |
1049 | ||
1050 | /* cleanup */ | |
1051 | if (current_component != current_subpath) | |
1052 | free(current_subpath); | |
1053 | if (current_component != p_eff) | |
1054 | free(current_component); | |
1055 | current_component = current_subpath = NULL; | |
1056 | continue; | |
4fb3cba5 | 1057 | |
33ad9f1a | 1058 | cleanup_from_error: |
ec64264d | 1059 | /* called if an error occurred in the loop, so we |
33ad9f1a CS |
1060 | * do some additional cleanup here |
1061 | */ | |
1062 | saved_errno = errno; | |
1063 | if (current_component != current_subpath) | |
1064 | free(current_subpath); | |
1065 | if (current_component != p_eff) | |
1066 | free(current_component); | |
1067 | free(current_entire_path); | |
1068 | errno = saved_errno; | |
1069 | goto out_initial_error; | |
fd4f5a56 DL |
1070 | } |
1071 | ||
33ad9f1a CS |
1072 | /* we're done, now update the paths */ |
1073 | for (i = 0, info_ptr = base_info; info_ptr; info_ptr = info_ptr->next, i++) { | |
47d8fb3b CS |
1074 | /* ignore legacy 'ns' subsystem here, lxc_cgroup_create_legacy |
1075 | * will take care of it | |
1076 | * Since we do a continue in above loop, new_cgroup_paths[i] is | |
1077 | * unset anyway, as is new_cgroup_paths_sub[i] | |
692ba18f | 1078 | */ |
47d8fb3b CS |
1079 | if (lxc_string_in_array("ns", (const char **)info_ptr->hierarchy->subsystems)) |
1080 | continue; | |
1081 | free(info_ptr->cgroup_path); | |
1082 | info_ptr->cgroup_path = new_cgroup_paths[i]; | |
1083 | info_ptr->cgroup_path_sub = new_cgroup_paths_sub[i]; | |
fd4f5a56 | 1084 | } |
33ad9f1a CS |
1085 | /* don't use lxc_free_array since we used the array members |
1086 | * to store them in our result... | |
1087 | */ | |
1088 | free(new_cgroup_paths); | |
1089 | free(new_cgroup_paths_sub); | |
1090 | free(path_so_far); | |
1091 | lxc_free_array((void **)cgroup_path_components, free); | |
1092 | return base_info; | |
1093 | ||
1094 | out_initial_error: | |
1095 | saved_errno = errno; | |
1096 | free(path_so_far); | |
6a9e0f26 | 1097 | lxc_cgroup_process_info_free_and_remove(base_info, NULL); |
33ad9f1a CS |
1098 | lxc_free_array((void **)new_cgroup_paths, free); |
1099 | lxc_free_array((void **)new_cgroup_paths_sub, free); | |
1100 | lxc_free_array((void **)cgroup_path_components, free); | |
1101 | errno = saved_errno; | |
1102 | return NULL; | |
c8f7c563 CS |
1103 | } |
1104 | ||
4fb3cba5 | 1105 | static int lxc_cgroup_create_legacy(struct cgroup_process_info *base_info, const char *name, pid_t pid) |
47d8fb3b CS |
1106 | { |
1107 | struct cgroup_process_info *info_ptr; | |
1108 | int r; | |
1109 | ||
1110 | for (info_ptr = base_info; info_ptr; info_ptr = info_ptr->next) { | |
1111 | if (!lxc_string_in_array("ns", (const char **)info_ptr->hierarchy->subsystems)) | |
1112 | continue; | |
1113 | /* | |
1114 | * For any path which has ns cgroup mounted, handler->pid is already | |
1115 | * moved into a container called '%d % (handler->pid)'. Rename it to | |
1116 | * the cgroup name and record that. | |
1117 | */ | |
1118 | char *tmp = cgroup_rename_nsgroup((const char *)info_ptr->designated_mount_point->mount_point, | |
1119 | info_ptr->cgroup_path, pid, name); | |
1120 | if (!tmp) | |
1121 | return -1; | |
1122 | free(info_ptr->cgroup_path); | |
1123 | info_ptr->cgroup_path = tmp; | |
1124 | r = lxc_grow_array((void ***)&info_ptr->created_paths, &info_ptr->created_paths_capacity, info_ptr->created_paths_count + 1, 8); | |
1125 | if (r < 0) | |
1126 | return -1; | |
1127 | tmp = strdup(tmp); | |
1128 | if (!tmp) | |
1129 | return -1; | |
1130 | info_ptr->created_paths[info_ptr->created_paths_count++] = tmp; | |
1131 | } | |
1132 | return 0; | |
1133 | } | |
1134 | ||
33ad9f1a | 1135 | /* get the cgroup membership of a given container */ |
4fb3cba5 | 1136 | static struct cgroup_process_info *lxc_cgroup_get_container_info(const char *name, const char *lxcpath, struct cgroup_meta_data *meta_data) |
c8f7c563 | 1137 | { |
33ad9f1a CS |
1138 | struct cgroup_process_info *result = NULL; |
1139 | int saved_errno = 0; | |
1140 | size_t i; | |
1141 | struct cgroup_process_info **cptr = &result; | |
1142 | struct cgroup_process_info *entry = NULL; | |
1143 | char *path = NULL; | |
1144 | ||
1145 | for (i = 0; i <= meta_data->maximum_hierarchy; i++) { | |
1146 | struct cgroup_hierarchy *h = meta_data->hierarchies[i]; | |
1147 | if (!h || !h->used) | |
1148 | continue; | |
c8f7c563 | 1149 | |
33ad9f1a CS |
1150 | /* use the command interface to look for the cgroup */ |
1151 | path = lxc_cmd_get_cgroup_path(name, lxcpath, h->subsystems[0]); | |
c661b0a8 DE |
1152 | if (!path) { |
1153 | h->used = false; | |
c661b0a8 DE |
1154 | continue; |
1155 | } | |
33ad9f1a CS |
1156 | |
1157 | entry = calloc(1, sizeof(struct cgroup_process_info)); | |
1158 | if (!entry) | |
1159 | goto out_error; | |
1160 | entry->meta_ref = lxc_cgroup_get_meta(meta_data); | |
1161 | entry->hierarchy = h; | |
1162 | entry->cgroup_path = path; | |
1163 | path = NULL; | |
1164 | ||
1165 | /* it is not an error if we don't find anything here, | |
1166 | * it is up to the caller to decide what to do in that | |
1167 | * case */ | |
1168 | entry->designated_mount_point = lxc_cgroup_find_mount_point(h, entry->cgroup_path, true); | |
1169 | ||
1170 | *cptr = entry; | |
1171 | cptr = &entry->next; | |
1172 | entry = NULL; | |
c8f7c563 CS |
1173 | } |
1174 | ||
33ad9f1a CS |
1175 | return result; |
1176 | out_error: | |
1177 | saved_errno = errno; | |
1178 | free(path); | |
1179 | lxc_cgroup_process_info_free(result); | |
1180 | lxc_cgroup_process_info_free(entry); | |
1181 | errno = saved_errno; | |
1182 | return NULL; | |
fd4f5a56 DL |
1183 | } |
1184 | ||
33ad9f1a | 1185 | /* move a processs to the cgroups specified by the membership */ |
4fb3cba5 | 1186 | static int lxc_cgroupfs_enter(struct cgroup_process_info *info, pid_t pid, bool enter_sub) |
4f17323e | 1187 | { |
33ad9f1a CS |
1188 | char pid_buf[32]; |
1189 | char *cgroup_tasks_fn; | |
1190 | int r; | |
1191 | struct cgroup_process_info *info_ptr; | |
1192 | ||
1193 | snprintf(pid_buf, 32, "%lu", (unsigned long)pid); | |
1194 | for (info_ptr = info; info_ptr; info_ptr = info_ptr->next) { | |
1195 | char *cgroup_path = (enter_sub && info_ptr->cgroup_path_sub) ? | |
1196 | info_ptr->cgroup_path_sub : | |
1197 | info_ptr->cgroup_path; | |
1198 | ||
1199 | if (!info_ptr->designated_mount_point) { | |
1200 | info_ptr->designated_mount_point = lxc_cgroup_find_mount_point(info_ptr->hierarchy, cgroup_path, true); | |
1201 | if (!info_ptr->designated_mount_point) { | |
1202 | SYSERROR("Could not add pid %lu to cgroup %s: internal error (couldn't find any writable mountpoint to cgroup filesystem)", (unsigned long)pid, cgroup_path); | |
1203 | return -1; | |
1204 | } | |
1205 | } | |
4f17323e | 1206 | |
33ad9f1a CS |
1207 | cgroup_tasks_fn = cgroup_to_absolute_path(info_ptr->designated_mount_point, cgroup_path, "/tasks"); |
1208 | if (!cgroup_tasks_fn) { | |
1209 | SYSERROR("Could not add pid %lu to cgroup %s: internal error", (unsigned long)pid, cgroup_path); | |
1210 | return -1; | |
1211 | } | |
4f17323e | 1212 | |
33ad9f1a | 1213 | r = lxc_write_to_file(cgroup_tasks_fn, pid_buf, strlen(pid_buf), false); |
5903da82 | 1214 | free(cgroup_tasks_fn); |
ea439aac | 1215 | if (r < 0 && is_crucial_hierarchy(info_ptr->hierarchy)) { |
33ad9f1a CS |
1216 | SYSERROR("Could not add pid %lu to cgroup %s: internal error", (unsigned long)pid, cgroup_path); |
1217 | return -1; | |
1218 | } | |
4f17323e CS |
1219 | } |
1220 | ||
33ad9f1a | 1221 | return 0; |
4f17323e CS |
1222 | } |
1223 | ||
33ad9f1a CS |
1224 | /* free process membership information */ |
1225 | void lxc_cgroup_process_info_free(struct cgroup_process_info *info) | |
fc7de561 | 1226 | { |
33ad9f1a CS |
1227 | struct cgroup_process_info *next; |
1228 | if (!info) | |
b98f7d6e | 1229 | return; |
33ad9f1a CS |
1230 | next = info->next; |
1231 | lxc_cgroup_put_meta(info->meta_ref); | |
1232 | free(info->cgroup_path); | |
1233 | free(info->cgroup_path_sub); | |
1234 | lxc_free_array((void **)info->created_paths, free); | |
1235 | free(info); | |
1236 | lxc_cgroup_process_info_free(next); | |
fc7de561 SH |
1237 | } |
1238 | ||
33ad9f1a | 1239 | /* free process membership information and remove cgroups that were created */ |
6a9e0f26 | 1240 | void lxc_cgroup_process_info_free_and_remove(struct cgroup_process_info *info, struct lxc_conf *conf) |
b98f7d6e | 1241 | { |
33ad9f1a CS |
1242 | struct cgroup_process_info *next; |
1243 | char **pp; | |
1244 | if (!info) | |
1245 | return; | |
1246 | next = info->next; | |
603c64c2 | 1247 | { |
33ad9f1a CS |
1248 | struct cgroup_mount_point *mp = info->designated_mount_point; |
1249 | if (!mp) | |
1250 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, true); | |
1251 | if (mp) | |
1252 | /* ignore return value here, perhaps we created the | |
1253 | * '/lxc' cgroup in this container but another container | |
1254 | * is still running (for example) | |
1255 | */ | |
6a9e0f26 | 1256 | (void)remove_cgroup(mp, info->cgroup_path, true, conf); |
603c64c2 SH |
1257 | } |
1258 | for (pp = info->created_paths; pp && *pp; pp++); | |
1259 | for ((void)(pp && --pp); info->created_paths && pp >= info->created_paths; --pp) { | |
33ad9f1a | 1260 | free(*pp); |
b98f7d6e | 1261 | } |
33ad9f1a CS |
1262 | free(info->created_paths); |
1263 | lxc_cgroup_put_meta(info->meta_ref); | |
1264 | free(info->cgroup_path); | |
1265 | free(info->cgroup_path_sub); | |
1266 | free(info); | |
6a9e0f26 | 1267 | lxc_cgroup_process_info_free_and_remove(next, conf); |
33ad9f1a | 1268 | } |
b98f7d6e | 1269 | |
4fb3cba5 | 1270 | static char *lxc_cgroup_get_hierarchy_path_data(const char *subsystem, struct cgfs_data *d) |
33ad9f1a | 1271 | { |
d4ef7c50 SH |
1272 | struct cgroup_process_info *info = d->info; |
1273 | info = find_info_for_subsystem(info, subsystem); | |
33ad9f1a CS |
1274 | if (!info) |
1275 | return NULL; | |
f348e47c | 1276 | prune_init_scope(info->cgroup_path); |
33ad9f1a | 1277 | return info->cgroup_path; |
b98f7d6e SH |
1278 | } |
1279 | ||
4fb3cba5 | 1280 | static char *lxc_cgroup_get_hierarchy_abs_path_data(const char *subsystem, struct cgfs_data *d) |
b98f7d6e | 1281 | { |
d4ef7c50 | 1282 | struct cgroup_process_info *info = d->info; |
33ad9f1a | 1283 | struct cgroup_mount_point *mp = NULL; |
d4ef7c50 SH |
1284 | |
1285 | info = find_info_for_subsystem(info, subsystem); | |
33ad9f1a CS |
1286 | if (!info) |
1287 | return NULL; | |
1288 | if (info->designated_mount_point) { | |
8900b9eb | 1289 | mp = info->designated_mount_point; |
33ad9f1a CS |
1290 | } else { |
1291 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, true); | |
1292 | if (!mp) | |
1293 | return NULL; | |
b98f7d6e | 1294 | } |
33ad9f1a | 1295 | return cgroup_to_absolute_path(mp, info->cgroup_path, NULL); |
b98f7d6e | 1296 | } |
55c76589 | 1297 | |
4fb3cba5 | 1298 | static char *lxc_cgroup_get_hierarchy_abs_path(const char *subsystem, const char *name, const char *lxcpath) |
9a93d992 | 1299 | { |
33ad9f1a CS |
1300 | struct cgroup_meta_data *meta; |
1301 | struct cgroup_process_info *base_info, *info; | |
1302 | struct cgroup_mount_point *mp; | |
1303 | char *result = NULL; | |
33ad9f1a CS |
1304 | |
1305 | meta = lxc_cgroup_load_meta(); | |
1306 | if (!meta) | |
9a93d992 | 1307 | return NULL; |
33ad9f1a CS |
1308 | base_info = lxc_cgroup_get_container_info(name, lxcpath, meta); |
1309 | if (!base_info) | |
178938fe | 1310 | goto out1; |
33ad9f1a CS |
1311 | info = find_info_for_subsystem(base_info, subsystem); |
1312 | if (!info) | |
178938fe | 1313 | goto out2; |
33ad9f1a | 1314 | if (info->designated_mount_point) { |
8900b9eb | 1315 | mp = info->designated_mount_point; |
33ad9f1a CS |
1316 | } else { |
1317 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, true); | |
1318 | if (!mp) | |
178938fe | 1319 | goto out3; |
33ad9f1a CS |
1320 | } |
1321 | result = cgroup_to_absolute_path(mp, info->cgroup_path, NULL); | |
178938fe | 1322 | out3: |
178938fe | 1323 | out2: |
33ad9f1a | 1324 | lxc_cgroup_process_info_free(base_info); |
178938fe | 1325 | out1: |
33ad9f1a | 1326 | lxc_cgroup_put_meta(meta); |
33ad9f1a CS |
1327 | return result; |
1328 | } | |
9a93d992 | 1329 | |
4fb3cba5 | 1330 | static int lxc_cgroup_set_data(const char *filename, const char *value, struct cgfs_data *d) |
33ad9f1a CS |
1331 | { |
1332 | char *subsystem = NULL, *p, *path; | |
1333 | int ret = -1; | |
9a93d992 | 1334 | |
33ad9f1a CS |
1335 | subsystem = alloca(strlen(filename) + 1); |
1336 | strcpy(subsystem, filename); | |
46cd2845 | 1337 | if ((p = strchr(subsystem, '.')) != NULL) |
33ad9f1a | 1338 | *p = '\0'; |
9a93d992 | 1339 | |
4f875f70 | 1340 | errno = ENOENT; |
4fb3cba5 | 1341 | path = lxc_cgroup_get_hierarchy_abs_path_data(subsystem, d); |
33ad9f1a CS |
1342 | if (path) { |
1343 | ret = do_cgroup_set(path, filename, value); | |
4f875f70 | 1344 | int saved_errno = errno; |
33ad9f1a | 1345 | free(path); |
4f875f70 | 1346 | errno = saved_errno; |
9a93d992 | 1347 | } |
33ad9f1a CS |
1348 | return ret; |
1349 | } | |
9a93d992 | 1350 | |
4fb3cba5 | 1351 | static int lxc_cgroupfs_set(const char *filename, const char *value, const char *name, const char *lxcpath) |
9a93d992 | 1352 | { |
33ad9f1a CS |
1353 | char *subsystem = NULL, *p, *path; |
1354 | int ret = -1; | |
9a93d992 | 1355 | |
33ad9f1a CS |
1356 | subsystem = alloca(strlen(filename) + 1); |
1357 | strcpy(subsystem, filename); | |
46cd2845 | 1358 | if ((p = strchr(subsystem, '.')) != NULL) |
33ad9f1a | 1359 | *p = '\0'; |
9a93d992 | 1360 | |
33ad9f1a CS |
1361 | path = lxc_cgroup_get_hierarchy_abs_path(subsystem, name, lxcpath); |
1362 | if (path) { | |
1363 | ret = do_cgroup_set(path, filename, value); | |
1364 | free(path); | |
1365 | } | |
b98f7d6e | 1366 | return ret; |
9a93d992 SH |
1367 | } |
1368 | ||
4fb3cba5 | 1369 | static int lxc_cgroupfs_get(const char *filename, char *value, size_t len, const char *name, const char *lxcpath) |
9a93d992 | 1370 | { |
33ad9f1a CS |
1371 | char *subsystem = NULL, *p, *path; |
1372 | int ret = -1; | |
1373 | ||
1374 | subsystem = alloca(strlen(filename) + 1); | |
1375 | strcpy(subsystem, filename); | |
46cd2845 | 1376 | if ((p = strchr(subsystem, '.')) != NULL) |
33ad9f1a CS |
1377 | *p = '\0'; |
1378 | ||
1379 | path = lxc_cgroup_get_hierarchy_abs_path(subsystem, name, lxcpath); | |
1380 | if (path) { | |
1381 | ret = do_cgroup_get(path, filename, value, len); | |
1382 | free(path); | |
9a93d992 | 1383 | } |
33ad9f1a | 1384 | return ret; |
9a93d992 SH |
1385 | } |
1386 | ||
4fb3cba5 | 1387 | static bool cgroupfs_mount_cgroup(void *hdata, const char *root, int type) |
aae1f3c4 CS |
1388 | { |
1389 | size_t bufsz = strlen(root) + sizeof("/sys/fs/cgroup"); | |
1390 | char *path = NULL; | |
1391 | char **parts = NULL; | |
1392 | char *dirname = NULL; | |
1393 | char *abs_path = NULL; | |
1394 | char *abs_path2 = NULL; | |
d4ef7c50 SH |
1395 | struct cgfs_data *cgfs_d; |
1396 | struct cgroup_process_info *info, *base_info; | |
aae1f3c4 CS |
1397 | int r, saved_errno = 0; |
1398 | ||
4608594e SH |
1399 | if (cgns_supported()) |
1400 | return true; | |
1401 | ||
4fb3cba5 DE |
1402 | cgfs_d = hdata; |
1403 | if (!cgfs_d) | |
1404 | return false; | |
d4ef7c50 SH |
1405 | base_info = cgfs_d->info; |
1406 | ||
0769b82a CS |
1407 | /* If we get passed the _NOSPEC types, we default to _MIXED, since we don't |
1408 | * have access to the lxc_conf object at this point. It really should be up | |
1409 | * to the caller to fix this, but this doesn't really hurt. | |
1410 | */ | |
1411 | if (type == LXC_AUTO_CGROUP_FULL_NOSPEC) | |
1412 | type = LXC_AUTO_CGROUP_FULL_MIXED; | |
1413 | else if (type == LXC_AUTO_CGROUP_NOSPEC) | |
1414 | type = LXC_AUTO_CGROUP_MIXED; | |
1415 | ||
7997d7da CS |
1416 | if (type < LXC_AUTO_CGROUP_RO || type > LXC_AUTO_CGROUP_FULL_MIXED) { |
1417 | ERROR("could not mount cgroups into container: invalid type specified internally"); | |
1418 | errno = EINVAL; | |
c476bdce | 1419 | return false; |
7997d7da CS |
1420 | } |
1421 | ||
aae1f3c4 CS |
1422 | path = calloc(1, bufsz); |
1423 | if (!path) | |
c476bdce | 1424 | return false; |
aae1f3c4 | 1425 | snprintf(path, bufsz, "%s/sys/fs/cgroup", root); |
592fd47a SH |
1426 | r = safe_mount("cgroup_root", path, "tmpfs", |
1427 | MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_RELATIME, | |
1428 | "size=10240k,mode=755", | |
1429 | root); | |
aae1f3c4 CS |
1430 | if (r < 0) { |
1431 | SYSERROR("could not mount tmpfs to /sys/fs/cgroup in the container"); | |
c476bdce | 1432 | return false; |
aae1f3c4 CS |
1433 | } |
1434 | ||
1435 | /* now mount all the hierarchies we care about */ | |
1436 | for (info = base_info; info; info = info->next) { | |
1437 | size_t subsystem_count, i; | |
1438 | struct cgroup_mount_point *mp = info->designated_mount_point; | |
d3f99e96 | 1439 | if (!mountpoint_is_accessible(mp)) |
aae1f3c4 | 1440 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, true); |
d3f99e96 | 1441 | |
aae1f3c4 CS |
1442 | if (!mp) { |
1443 | SYSERROR("could not find original mount point for cgroup hierarchy while trying to mount cgroup filesystem"); | |
1444 | goto out_error; | |
1445 | } | |
1446 | ||
1447 | subsystem_count = lxc_array_len((void **)info->hierarchy->subsystems); | |
1448 | parts = calloc(subsystem_count + 1, sizeof(char *)); | |
1449 | if (!parts) | |
1450 | goto out_error; | |
1451 | ||
1452 | for (i = 0; i < subsystem_count; i++) { | |
1453 | if (!strncmp(info->hierarchy->subsystems[i], "name=", 5)) | |
1454 | parts[i] = info->hierarchy->subsystems[i] + 5; | |
1455 | else | |
1456 | parts[i] = info->hierarchy->subsystems[i]; | |
1457 | } | |
1458 | dirname = lxc_string_join(",", (const char **)parts, false); | |
1459 | if (!dirname) | |
1460 | goto out_error; | |
1461 | ||
1462 | /* create subsystem directory */ | |
1463 | abs_path = lxc_append_paths(path, dirname); | |
1464 | if (!abs_path) | |
1465 | goto out_error; | |
1466 | r = mkdir_p(abs_path, 0755); | |
1467 | if (r < 0 && errno != EEXIST) { | |
1468 | SYSERROR("could not create cgroup subsystem directory /sys/fs/cgroup/%s", dirname); | |
1469 | goto out_error; | |
1470 | } | |
1471 | ||
aae1f3c4 CS |
1472 | abs_path2 = lxc_append_paths(abs_path, info->cgroup_path); |
1473 | if (!abs_path2) | |
1474 | goto out_error; | |
aae1f3c4 | 1475 | |
7997d7da CS |
1476 | if (type == LXC_AUTO_CGROUP_FULL_RO || type == LXC_AUTO_CGROUP_FULL_RW || type == LXC_AUTO_CGROUP_FULL_MIXED) { |
1477 | /* bind-mount the cgroup entire filesystem there */ | |
1478 | if (strcmp(mp->mount_prefix, "/") != 0) { | |
1479 | /* FIXME: maybe we should just try to remount the entire hierarchy | |
1480 | * with a regular mount command? may that works? */ | |
1481 | ERROR("could not automatically mount cgroup-full to /sys/fs/cgroup/%s: host has no mount point for this cgroup filesystem that has access to the root cgroup", dirname); | |
1482 | goto out_error; | |
1483 | } | |
1484 | r = mount(mp->mount_point, abs_path, "none", MS_BIND, 0); | |
1485 | if (r < 0) { | |
1486 | SYSERROR("error bind-mounting %s to %s", mp->mount_point, abs_path); | |
1487 | goto out_error; | |
1488 | } | |
f8f3c3c0 SG |
1489 | /* main cgroup path should be read-only */ |
1490 | if (type == LXC_AUTO_CGROUP_FULL_RO || type == LXC_AUTO_CGROUP_FULL_MIXED) { | |
1491 | r = mount(NULL, abs_path, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL); | |
1492 | if (r < 0) { | |
1493 | SYSERROR("error re-mounting %s readonly", abs_path); | |
1494 | goto out_error; | |
1495 | } | |
1496 | } | |
7997d7da CS |
1497 | /* own cgroup should be read-write */ |
1498 | if (type == LXC_AUTO_CGROUP_FULL_MIXED) { | |
1499 | r = mount(abs_path2, abs_path2, NULL, MS_BIND, NULL); | |
1500 | if (r < 0) { | |
1501 | SYSERROR("error bind-mounting %s onto itself", abs_path2); | |
1502 | goto out_error; | |
1503 | } | |
1504 | r = mount(NULL, abs_path2, NULL, MS_REMOUNT|MS_BIND, NULL); | |
1505 | if (r < 0) { | |
1506 | SYSERROR("error re-mounting %s readwrite", abs_path2); | |
1507 | goto out_error; | |
1508 | } | |
1509 | } | |
1510 | } else { | |
1511 | /* create path for container's cgroup */ | |
1512 | r = mkdir_p(abs_path2, 0755); | |
1513 | if (r < 0 && errno != EEXIST) { | |
1514 | SYSERROR("could not create cgroup directory /sys/fs/cgroup/%s%s", dirname, info->cgroup_path); | |
1515 | goto out_error; | |
1516 | } | |
aae1f3c4 | 1517 | |
b46f0553 CS |
1518 | /* for read-only and mixed cases, we have to bind-mount the tmpfs directory |
1519 | * that points to the hierarchy itself (i.e. /sys/fs/cgroup/cpu etc.) onto | |
1520 | * itself and then bind-mount it read-only, since we keep the tmpfs itself | |
1521 | * read-write (see comment below) | |
1522 | */ | |
1523 | if (type == LXC_AUTO_CGROUP_MIXED || type == LXC_AUTO_CGROUP_RO) { | |
1524 | r = mount(abs_path, abs_path, NULL, MS_BIND, NULL); | |
1525 | if (r < 0) { | |
1526 | SYSERROR("error bind-mounting %s onto itself", abs_path); | |
1527 | goto out_error; | |
1528 | } | |
1529 | r = mount(NULL, abs_path, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL); | |
1530 | if (r < 0) { | |
1531 | SYSERROR("error re-mounting %s readonly", abs_path); | |
1532 | goto out_error; | |
1533 | } | |
1534 | } | |
1535 | ||
7997d7da CS |
1536 | free(abs_path); |
1537 | abs_path = NULL; | |
1538 | ||
1539 | /* bind-mount container's cgroup to that directory */ | |
1540 | abs_path = cgroup_to_absolute_path(mp, info->cgroup_path, NULL); | |
1541 | if (!abs_path) | |
1542 | goto out_error; | |
1543 | r = mount(abs_path, abs_path2, "none", MS_BIND, 0); | |
ea439aac | 1544 | if (r < 0 && is_crucial_hierarchy(info->hierarchy)) { |
7997d7da CS |
1545 | SYSERROR("error bind-mounting %s to %s", abs_path, abs_path2); |
1546 | goto out_error; | |
1547 | } | |
1548 | if (type == LXC_AUTO_CGROUP_RO) { | |
1549 | r = mount(NULL, abs_path2, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL); | |
1550 | if (r < 0) { | |
1551 | SYSERROR("error re-mounting %s readonly", abs_path2); | |
1552 | goto out_error; | |
1553 | } | |
1554 | } | |
aae1f3c4 CS |
1555 | } |
1556 | ||
1557 | free(abs_path); | |
1558 | free(abs_path2); | |
1559 | abs_path = NULL; | |
1560 | abs_path2 = NULL; | |
1561 | ||
1562 | /* add symlinks for every single subsystem */ | |
1563 | if (subsystem_count > 1) { | |
1564 | for (i = 0; i < subsystem_count; i++) { | |
1565 | abs_path = lxc_append_paths(path, parts[i]); | |
1566 | if (!abs_path) | |
1567 | goto out_error; | |
1568 | r = symlink(dirname, abs_path); | |
1569 | if (r < 0) | |
1570 | WARN("could not create symlink %s -> %s in /sys/fs/cgroup of container", parts[i], dirname); | |
1571 | free(abs_path); | |
1572 | abs_path = NULL; | |
1573 | } | |
1574 | } | |
1575 | free(dirname); | |
1576 | free(parts); | |
1577 | dirname = NULL; | |
1578 | parts = NULL; | |
1579 | } | |
1580 | ||
b46f0553 CS |
1581 | /* We used to remount the entire tmpfs readonly if any :ro or |
1582 | * :mixed mode was specified. However, Ubuntu's mountall has the | |
1583 | * unfortunate behavior to block bootup if /sys/fs/cgroup is | |
1584 | * mounted read-only and cannot be remounted read-write. | |
1585 | * (mountall reads /lib/init/fstab and tries to (re-)mount all of | |
1586 | * these if they are not already mounted with the right options; | |
1587 | * it contains an entry for /sys/fs/cgroup. In case it can't do | |
1588 | * that, it prompts for the user to either manually fix it or | |
1589 | * boot anyway. But without user input, booting of the container | |
1590 | * hangs.) | |
1591 | * | |
1592 | * Instead of remounting the entire tmpfs readonly, we only | |
1593 | * remount the paths readonly that are part of the cgroup | |
1594 | * hierarchy. | |
f8f3c3c0 | 1595 | */ |
f8f3c3c0 | 1596 | |
aae1f3c4 CS |
1597 | free(path); |
1598 | ||
c476bdce | 1599 | return true; |
aae1f3c4 CS |
1600 | |
1601 | out_error: | |
1602 | saved_errno = errno; | |
1603 | free(path); | |
1604 | free(dirname); | |
1605 | free(parts); | |
1606 | free(abs_path); | |
1607 | free(abs_path2); | |
1608 | errno = saved_errno; | |
c476bdce | 1609 | return false; |
aae1f3c4 CS |
1610 | } |
1611 | ||
4fb3cba5 | 1612 | static int cgfs_nrtasks(void *hdata) |
33ad9f1a | 1613 | { |
4fb3cba5 DE |
1614 | struct cgfs_data *d = hdata; |
1615 | struct cgroup_process_info *info; | |
33ad9f1a CS |
1616 | struct cgroup_mount_point *mp = NULL; |
1617 | char *abs_path = NULL; | |
1618 | int ret; | |
460a1cf0 | 1619 | |
4fb3cba5 DE |
1620 | if (!d) { |
1621 | errno = ENOENT; | |
1622 | return -1; | |
1623 | } | |
1624 | ||
1625 | info = d->info; | |
33ad9f1a CS |
1626 | if (!info) { |
1627 | errno = ENOENT; | |
1628 | return -1; | |
b98f7d6e | 1629 | } |
c8f7c563 | 1630 | |
33ad9f1a | 1631 | if (info->designated_mount_point) { |
8900b9eb | 1632 | mp = info->designated_mount_point; |
33ad9f1a CS |
1633 | } else { |
1634 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, false); | |
1635 | if (!mp) | |
1636 | return -1; | |
c8f7c563 CS |
1637 | } |
1638 | ||
33ad9f1a CS |
1639 | abs_path = cgroup_to_absolute_path(mp, info->cgroup_path, NULL); |
1640 | if (!abs_path) | |
1641 | return -1; | |
1642 | ||
1643 | ret = cgroup_recursive_task_count(abs_path); | |
1644 | free(abs_path); | |
1645 | return ret; | |
c8f7c563 CS |
1646 | } |
1647 | ||
574c4428 QH |
1648 | static struct cgroup_process_info * |
1649 | lxc_cgroup_process_info_getx(const char *proc_pid_cgroup_str, | |
1650 | struct cgroup_meta_data *meta) | |
d08ba6ec | 1651 | { |
33ad9f1a CS |
1652 | struct cgroup_process_info *result = NULL; |
1653 | FILE *proc_pid_cgroup = NULL; | |
1654 | char *line = NULL; | |
1655 | size_t sz = 0; | |
1656 | int saved_errno = 0; | |
1657 | struct cgroup_process_info **cptr = &result; | |
1658 | struct cgroup_process_info *entry = NULL; | |
1659 | ||
1660 | proc_pid_cgroup = fopen_cloexec(proc_pid_cgroup_str, "r"); | |
1661 | if (!proc_pid_cgroup) | |
b98f7d6e | 1662 | return NULL; |
1ac470c0 | 1663 | |
33ad9f1a CS |
1664 | while (getline(&line, &sz, proc_pid_cgroup) != -1) { |
1665 | /* file format: hierarchy:subsystems:group */ | |
1666 | char *colon1; | |
1667 | char *colon2; | |
1668 | char *endptr; | |
1669 | int hierarchy_number; | |
1670 | struct cgroup_hierarchy *h = NULL; | |
fd4f5a56 | 1671 | |
33ad9f1a | 1672 | if (!line[0]) |
ae5c8b8e | 1673 | continue; |
b98f7d6e | 1674 | |
33ad9f1a CS |
1675 | if (line[strlen(line) - 1] == '\n') |
1676 | line[strlen(line) - 1] = '\0'; | |
1677 | ||
1678 | colon1 = strchr(line, ':'); | |
1679 | if (!colon1) | |
8900b9eb | 1680 | continue; |
33ad9f1a CS |
1681 | *colon1++ = '\0'; |
1682 | colon2 = strchr(colon1, ':'); | |
1683 | if (!colon2) | |
ae5c8b8e | 1684 | continue; |
33ad9f1a | 1685 | *colon2++ = '\0'; |
e4659536 | 1686 | |
33ad9f1a CS |
1687 | endptr = NULL; |
1688 | hierarchy_number = strtoul(line, &endptr, 10); | |
1689 | if (!endptr || *endptr) | |
9a93d992 | 1690 | continue; |
9a93d992 | 1691 | |
33ad9f1a CS |
1692 | if (hierarchy_number > meta->maximum_hierarchy) { |
1693 | /* we encountered a hierarchy we didn't have before, | |
1694 | * so probably somebody remounted some stuff in the | |
1695 | * mean time... | |
1696 | */ | |
1697 | errno = EAGAIN; | |
1698 | goto out_error; | |
b98f7d6e | 1699 | } |
33ad9f1a CS |
1700 | |
1701 | h = meta->hierarchies[hierarchy_number]; | |
1702 | if (!h) { | |
1703 | /* we encountered a hierarchy that was thought to be | |
1704 | * dead before, so probably somebody remounted some | |
1705 | * stuff in the mean time... | |
1706 | */ | |
1707 | errno = EAGAIN; | |
1708 | goto out_error; | |
b98f7d6e | 1709 | } |
33ad9f1a CS |
1710 | |
1711 | /* we are told that we should ignore this hierarchy */ | |
1712 | if (!h->used) | |
b98f7d6e | 1713 | continue; |
5193cc3d | 1714 | |
33ad9f1a CS |
1715 | entry = calloc(1, sizeof(struct cgroup_process_info)); |
1716 | if (!entry) | |
1717 | goto out_error; | |
fd4f5a56 | 1718 | |
33ad9f1a CS |
1719 | entry->meta_ref = lxc_cgroup_get_meta(meta); |
1720 | entry->hierarchy = h; | |
1721 | entry->cgroup_path = strdup(colon2); | |
1722 | if (!entry->cgroup_path) | |
1723 | goto out_error; | |
3939a22a | 1724 | prune_init_scope(entry->cgroup_path); |
d08ba6ec | 1725 | |
33ad9f1a CS |
1726 | *cptr = entry; |
1727 | cptr = &entry->next; | |
1728 | entry = NULL; | |
b98f7d6e | 1729 | } |
b98f7d6e | 1730 | |
33ad9f1a CS |
1731 | fclose(proc_pid_cgroup); |
1732 | free(line); | |
1733 | return result; | |
1734 | ||
1735 | out_error: | |
1736 | saved_errno = errno; | |
1737 | if (proc_pid_cgroup) | |
1738 | fclose(proc_pid_cgroup); | |
1739 | lxc_cgroup_process_info_free(result); | |
1740 | lxc_cgroup_process_info_free(entry); | |
1741 | free(line); | |
1742 | errno = saved_errno; | |
ae5c8b8e | 1743 | return NULL; |
36b86299 DL |
1744 | } |
1745 | ||
574c4428 QH |
1746 | static char **subsystems_from_mount_options(const char *mount_options, |
1747 | char **kernel_list) | |
36b86299 | 1748 | { |
33ad9f1a CS |
1749 | char *token, *str, *saveptr = NULL; |
1750 | char **result = NULL; | |
1751 | size_t result_capacity = 0; | |
8900b9eb | 1752 | size_t result_count = 0; |
33ad9f1a CS |
1753 | int saved_errno; |
1754 | int r; | |
ef342abb | 1755 | |
33ad9f1a CS |
1756 | str = alloca(strlen(mount_options)+1); |
1757 | strcpy(str, mount_options); | |
1758 | for (; (token = strtok_r(str, ",", &saveptr)); str = NULL) { | |
1759 | /* we have a subsystem if it's either in the list of | |
1760 | * subsystems provided by the kernel OR if it starts | |
1761 | * with name= for named hierarchies | |
1762 | */ | |
836514a8 U |
1763 | r = lxc_grow_array((void ***)&result, &result_capacity, result_count + 1, 12); |
1764 | if (r < 0) | |
1765 | goto out_free; | |
1766 | result[result_count + 1] = NULL; | |
1767 | if (strncmp(token, "name=", 5) && !lxc_string_in_array(token, (const char **)kernel_list)) { | |
1768 | // this is eg 'systemd' but the mount will be 'name=systemd' | |
1769 | result[result_count] = malloc(strlen(token) + 6); | |
1770 | if (result[result_count]) | |
1771 | sprintf(result[result_count], "name=%s", token); | |
1772 | } else | |
33ad9f1a | 1773 | result[result_count] = strdup(token); |
836514a8 U |
1774 | if (!result[result_count]) |
1775 | goto out_free; | |
1776 | result_count++; | |
ae5c8b8e | 1777 | } |
f0e64b8b | 1778 | |
33ad9f1a CS |
1779 | return result; |
1780 | ||
1781 | out_free: | |
1782 | saved_errno = errno; | |
1783 | lxc_free_array((void**)result, free); | |
1784 | errno = saved_errno; | |
1785 | return NULL; | |
b98f7d6e SH |
1786 | } |
1787 | ||
574c4428 | 1788 | static void lxc_cgroup_mount_point_free(struct cgroup_mount_point *mp) |
b98f7d6e | 1789 | { |
33ad9f1a CS |
1790 | if (!mp) |
1791 | return; | |
1792 | free(mp->mount_point); | |
1793 | free(mp->mount_prefix); | |
1794 | free(mp); | |
bcbd102c SH |
1795 | } |
1796 | ||
574c4428 | 1797 | static void lxc_cgroup_hierarchy_free(struct cgroup_hierarchy *h) |
341a9bd8 | 1798 | { |
33ad9f1a CS |
1799 | if (!h) |
1800 | return; | |
2446c321 CB |
1801 | if (h->subsystems) { |
1802 | lxc_free_array((void **)h->subsystems, free); | |
1803 | h->subsystems = NULL; | |
1804 | } | |
1805 | if (h->all_mount_points) { | |
1806 | free(h->all_mount_points); | |
1807 | h->all_mount_points = NULL; | |
1808 | } | |
33ad9f1a | 1809 | free(h); |
2446c321 | 1810 | h = NULL; |
33ad9f1a | 1811 | } |
341a9bd8 | 1812 | |
574c4428 | 1813 | static bool is_valid_cgroup(const char *name) |
33ad9f1a CS |
1814 | { |
1815 | const char *p; | |
1816 | for (p = name; *p; p++) { | |
28bb9321 QH |
1817 | /* Use the ASCII printable characters range(32 - 127) |
1818 | * is reasonable, we kick out 32(SPACE) because it'll | |
1819 | * break legacy lxc-ls | |
1820 | */ | |
1821 | if (*p <= 32 || *p >= 127 || *p == '/') | |
33ad9f1a | 1822 | return false; |
341a9bd8 | 1823 | } |
33ad9f1a CS |
1824 | return strcmp(name, ".") != 0 && strcmp(name, "..") != 0; |
1825 | } | |
341a9bd8 | 1826 | |
574c4428 | 1827 | static int create_or_remove_cgroup(bool do_remove, |
6a9e0f26 SH |
1828 | struct cgroup_mount_point *mp, const char *path, int recurse, |
1829 | struct lxc_conf *conf) | |
33ad9f1a CS |
1830 | { |
1831 | int r, saved_errno = 0; | |
1832 | char *buf = cgroup_to_absolute_path(mp, path, NULL); | |
1833 | if (!buf) | |
1834 | return -1; | |
341a9bd8 | 1835 | |
33ad9f1a | 1836 | /* create or remove directory */ |
603c64c2 | 1837 | if (do_remove) { |
01d59fe5 CB |
1838 | if (!dir_exists(buf)) |
1839 | return 0; | |
6a9e0f26 SH |
1840 | if (recurse) { |
1841 | if (conf && !lxc_list_empty(&conf->id_map)) | |
1842 | r = userns_exec_1(conf, rmdir_wrapper, buf); | |
1843 | else | |
1844 | r = cgroup_rmdir(buf); | |
1845 | } else | |
603c64c2 SH |
1846 | r = rmdir(buf); |
1847 | } else | |
1848 | r = mkdir(buf, 0777); | |
33ad9f1a CS |
1849 | saved_errno = errno; |
1850 | free(buf); | |
1851 | errno = saved_errno; | |
1852 | return r; | |
341a9bd8 | 1853 | } |
bcbd102c | 1854 | |
574c4428 | 1855 | static int create_cgroup(struct cgroup_mount_point *mp, const char *path) |
a6ddef61 | 1856 | { |
6a9e0f26 | 1857 | return create_or_remove_cgroup(false, mp, path, false, NULL); |
a6ddef61 MN |
1858 | } |
1859 | ||
574c4428 | 1860 | static int remove_cgroup(struct cgroup_mount_point *mp, |
6a9e0f26 | 1861 | const char *path, bool recurse, struct lxc_conf *conf) |
576f946d | 1862 | { |
6a9e0f26 | 1863 | return create_or_remove_cgroup(true, mp, path, recurse, conf); |
33ad9f1a | 1864 | } |
576f946d | 1865 | |
574c4428 QH |
1866 | static char *cgroup_to_absolute_path(struct cgroup_mount_point *mp, |
1867 | const char *path, const char *suffix) | |
33ad9f1a CS |
1868 | { |
1869 | /* first we have to make sure we subtract the mount point's prefix */ | |
1870 | char *prefix = mp->mount_prefix; | |
1871 | char *buf; | |
1872 | ssize_t len, rv; | |
1873 | ||
1874 | /* we want to make sure only absolute paths to cgroups are passed to us */ | |
1875 | if (path[0] != '/') { | |
1876 | errno = EINVAL; | |
1877 | return NULL; | |
1878 | } | |
b98f7d6e | 1879 | |
33ad9f1a CS |
1880 | if (prefix && !strcmp(prefix, "/")) |
1881 | prefix = NULL; | |
b98f7d6e | 1882 | |
33ad9f1a CS |
1883 | /* prefix doesn't match */ |
1884 | if (prefix && strncmp(prefix, path, strlen(prefix)) != 0) { | |
1885 | errno = EINVAL; | |
1886 | return NULL; | |
1887 | } | |
1888 | /* if prefix is /foo and path is /foobar */ | |
1889 | if (prefix && path[strlen(prefix)] != '/' && path[strlen(prefix)] != '\0') { | |
1890 | errno = EINVAL; | |
1891 | return NULL; | |
1892 | } | |
b98f7d6e | 1893 | |
33ad9f1a CS |
1894 | /* remove prefix from path */ |
1895 | path += prefix ? strlen(prefix) : 0; | |
b98f7d6e | 1896 | |
33ad9f1a CS |
1897 | len = strlen(mp->mount_point) + strlen(path) + (suffix ? strlen(suffix) : 0); |
1898 | buf = calloc(len + 1, 1); | |
50266dc6 DE |
1899 | if (!buf) |
1900 | return NULL; | |
33ad9f1a | 1901 | rv = snprintf(buf, len + 1, "%s%s%s", mp->mount_point, path, suffix ? suffix : ""); |
8900b9eb | 1902 | if (rv > len) { |
33ad9f1a CS |
1903 | free(buf); |
1904 | errno = ENOMEM; | |
8900b9eb | 1905 | return NULL; |
8b92dc3a | 1906 | } |
576f946d | 1907 | |
33ad9f1a | 1908 | return buf; |
e0f888d9 | 1909 | } |
283678ed | 1910 | |
574c4428 QH |
1911 | static struct cgroup_process_info * |
1912 | find_info_for_subsystem(struct cgroup_process_info *info, const char *subsystem) | |
283678ed | 1913 | { |
33ad9f1a CS |
1914 | struct cgroup_process_info *info_ptr; |
1915 | for (info_ptr = info; info_ptr; info_ptr = info_ptr->next) { | |
1916 | struct cgroup_hierarchy *h = info_ptr->hierarchy; | |
1917 | if (lxc_string_in_array(subsystem, (const char **)h->subsystems)) | |
1918 | return info_ptr; | |
b98f7d6e | 1919 | } |
33ad9f1a CS |
1920 | errno = ENOENT; |
1921 | return NULL; | |
1922 | } | |
283678ed | 1923 | |
574c4428 QH |
1924 | static int do_cgroup_get(const char *cgroup_path, const char *sub_filename, |
1925 | char *value, size_t len) | |
33ad9f1a CS |
1926 | { |
1927 | const char *parts[3] = { | |
1928 | cgroup_path, | |
1929 | sub_filename, | |
1930 | NULL | |
1931 | }; | |
1932 | char *filename; | |
1933 | int ret, saved_errno; | |
1934 | ||
1935 | filename = lxc_string_join("/", parts, false); | |
1936 | if (!filename) | |
1937 | return -1; | |
1938 | ||
1939 | ret = lxc_read_from_file(filename, value, len); | |
1940 | saved_errno = errno; | |
1941 | free(filename); | |
1942 | errno = saved_errno; | |
1943 | return ret; | |
283678ed | 1944 | } |
b113383b | 1945 | |
574c4428 QH |
1946 | static int do_cgroup_set(const char *cgroup_path, const char *sub_filename, |
1947 | const char *value) | |
b113383b | 1948 | { |
33ad9f1a CS |
1949 | const char *parts[3] = { |
1950 | cgroup_path, | |
1951 | sub_filename, | |
1952 | NULL | |
1953 | }; | |
1954 | char *filename; | |
1955 | int ret, saved_errno; | |
b113383b | 1956 | |
33ad9f1a CS |
1957 | filename = lxc_string_join("/", parts, false); |
1958 | if (!filename) | |
1959 | return -1; | |
b113383b | 1960 | |
33ad9f1a CS |
1961 | ret = lxc_write_to_file(filename, value, strlen(value), false); |
1962 | saved_errno = errno; | |
1963 | free(filename); | |
1964 | errno = saved_errno; | |
1965 | return ret; | |
b98f7d6e SH |
1966 | } |
1967 | ||
4fb3cba5 | 1968 | static int do_setup_cgroup_limits(struct cgfs_data *d, |
574c4428 | 1969 | struct lxc_list *cgroup_settings, bool do_devices) |
b98f7d6e | 1970 | { |
365d180a | 1971 | struct lxc_list *iterator, *sorted_cgroup_settings, *next; |
b98f7d6e SH |
1972 | struct lxc_cgroup *cg; |
1973 | int ret = -1; | |
1974 | ||
33ad9f1a | 1975 | if (lxc_list_empty(cgroup_settings)) |
b98f7d6e SH |
1976 | return 0; |
1977 | ||
aaf26830 | 1978 | sorted_cgroup_settings = sort_cgroup_settings(cgroup_settings); |
fac7c663 KT |
1979 | if (!sorted_cgroup_settings) { |
1980 | return -1; | |
1981 | } | |
aaf26830 KT |
1982 | |
1983 | lxc_list_for_each(iterator, sorted_cgroup_settings) { | |
b98f7d6e SH |
1984 | cg = iterator->elem; |
1985 | ||
33ad9f1a | 1986 | if (do_devices == !strncmp("devices", cg->subsystem, 7)) { |
b98f7d6e | 1987 | if (strcmp(cg->subsystem, "devices.deny") == 0 && |
4fb3cba5 | 1988 | cgroup_devices_has_allow_or_deny(d, cg->value, false)) |
b98f7d6e SH |
1989 | continue; |
1990 | if (strcmp(cg->subsystem, "devices.allow") == 0 && | |
4fb3cba5 | 1991 | cgroup_devices_has_allow_or_deny(d, cg->value, true)) |
b98f7d6e | 1992 | continue; |
4fb3cba5 | 1993 | if (lxc_cgroup_set_data(cg->subsystem, cg->value, d)) { |
dddf7c5b | 1994 | if (do_devices && (errno == EACCES || errno == EPERM)) { |
4f875f70 SH |
1995 | WARN("Error setting %s to %s for %s", |
1996 | cg->subsystem, cg->value, d->name); | |
1997 | continue; | |
1998 | } | |
dddf7c5b | 1999 | SYSERROR("Error setting %s to %s for %s", |
4fb3cba5 | 2000 | cg->subsystem, cg->value, d->name); |
b98f7d6e SH |
2001 | goto out; |
2002 | } | |
b113383b | 2003 | } |
b98f7d6e SH |
2004 | |
2005 | DEBUG("cgroup '%s' set to '%s'", cg->subsystem, cg->value); | |
b113383b SH |
2006 | } |
2007 | ||
b98f7d6e SH |
2008 | ret = 0; |
2009 | INFO("cgroup has been setup"); | |
2010 | out: | |
365d180a | 2011 | lxc_list_for_each_safe(iterator, sorted_cgroup_settings, next) { |
aaf26830 KT |
2012 | lxc_list_del(iterator); |
2013 | free(iterator); | |
2014 | } | |
365d180a | 2015 | free(sorted_cgroup_settings); |
b113383b SH |
2016 | return ret; |
2017 | } | |
b98f7d6e | 2018 | |
4fb3cba5 | 2019 | static bool cgroup_devices_has_allow_or_deny(struct cgfs_data *d, |
574c4428 | 2020 | char *v, bool for_allow) |
33ad9f1a CS |
2021 | { |
2022 | char *path; | |
2023 | FILE *devices_list; | |
8900b9eb | 2024 | char *line = NULL; |
33ad9f1a CS |
2025 | size_t sz = 0; |
2026 | bool ret = !for_allow; | |
2027 | const char *parts[3] = { | |
2028 | NULL, | |
2029 | "devices.list", | |
2030 | NULL | |
2031 | }; | |
2032 | ||
2033 | // XXX FIXME if users could use something other than 'lxc.devices.deny = a'. | |
2034 | // not sure they ever do, but they *could* | |
2035 | // right now, I'm assuming they do NOT | |
2036 | if (!for_allow && strcmp(v, "a") != 0 && strcmp(v, "a *:* rwm") != 0) | |
2037 | return false; | |
2038 | ||
4fb3cba5 | 2039 | parts[0] = (const char *)lxc_cgroup_get_hierarchy_abs_path_data("devices", d); |
33ad9f1a CS |
2040 | if (!parts[0]) |
2041 | return false; | |
2042 | path = lxc_string_join("/", parts, false); | |
2043 | if (!path) { | |
2044 | free((void *)parts[0]); | |
2045 | return false; | |
2046 | } | |
2047 | ||
2048 | devices_list = fopen_cloexec(path, "r"); | |
2049 | if (!devices_list) { | |
2050 | free(path); | |
2051 | return false; | |
2052 | } | |
2053 | ||
2054 | while (getline(&line, &sz, devices_list) != -1) { | |
2055 | size_t len = strlen(line); | |
2056 | if (len > 0 && line[len-1] == '\n') | |
2057 | line[len-1] = '\0'; | |
2058 | if (strcmp(line, "a *:* rwm") == 0) { | |
2059 | ret = for_allow; | |
2060 | goto out; | |
2061 | } else if (for_allow && strcmp(line, v) == 0) { | |
2062 | ret = true; | |
8900b9eb | 2063 | goto out; |
33ad9f1a CS |
2064 | } |
2065 | } | |
2066 | ||
2067 | out: | |
2068 | fclose(devices_list); | |
2069 | free(line); | |
2070 | free(path); | |
2071 | return ret; | |
2072 | } | |
2073 | ||
574c4428 | 2074 | static int cgroup_recursive_task_count(const char *cgroup_path) |
b98f7d6e | 2075 | { |
33ad9f1a | 2076 | DIR *d; |
33ad9f1a | 2077 | struct dirent *dent; |
33ad9f1a CS |
2078 | int n = 0, r; |
2079 | ||
33ad9f1a | 2080 | d = opendir(cgroup_path); |
74f96976 | 2081 | if (!d) |
33ad9f1a CS |
2082 | return 0; |
2083 | ||
74f96976 | 2084 | while ((dent = readdir(d))) { |
33ad9f1a CS |
2085 | const char *parts[3] = { |
2086 | cgroup_path, | |
2087 | dent->d_name, | |
2088 | NULL | |
2089 | }; | |
2090 | char *sub_path; | |
2091 | struct stat st; | |
2092 | ||
2093 | if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, "..")) | |
2094 | continue; | |
2095 | sub_path = lxc_string_join("/", parts, false); | |
2096 | if (!sub_path) { | |
2097 | closedir(d); | |
33ad9f1a CS |
2098 | return -1; |
2099 | } | |
2100 | r = stat(sub_path, &st); | |
2101 | if (r < 0) { | |
2102 | closedir(d); | |
33ad9f1a CS |
2103 | free(sub_path); |
2104 | return -1; | |
2105 | } | |
2106 | if (S_ISDIR(st.st_mode)) { | |
2107 | r = cgroup_recursive_task_count(sub_path); | |
2108 | if (r >= 0) | |
2109 | n += r; | |
2110 | } else if (!strcmp(dent->d_name, "tasks")) { | |
ccb4cabe | 2111 | r = lxc_count_file_lines(sub_path); |
33ad9f1a CS |
2112 | if (r >= 0) |
2113 | n += r; | |
2114 | } | |
2115 | free(sub_path); | |
2116 | } | |
2117 | closedir(d); | |
33ad9f1a CS |
2118 | |
2119 | return n; | |
2120 | } | |
2121 | ||
574c4428 QH |
2122 | static int handle_cgroup_settings(struct cgroup_mount_point *mp, |
2123 | char *cgroup_path) | |
b98f7d6e | 2124 | { |
33ad9f1a | 2125 | int r, saved_errno = 0; |
7e7243e1 | 2126 | char buf[2]; |
1ea59ad2 | 2127 | |
934b1673 SH |
2128 | mp->need_cpuset_init = false; |
2129 | ||
1ea59ad2 SH |
2130 | /* If this is the memory cgroup, we want to enforce hierarchy. |
2131 | * But don't fail if for some reason we can't. | |
2132 | */ | |
2edb53c7 SH |
2133 | if (lxc_string_in_array("memory", (const char **)mp->hierarchy->subsystems)) { |
2134 | char *cc_path = cgroup_to_absolute_path(mp, cgroup_path, "/memory.use_hierarchy"); | |
2135 | if (cc_path) { | |
2136 | r = lxc_read_from_file(cc_path, buf, 1); | |
2137 | if (r < 1 || buf[0] != '1') { | |
2138 | r = lxc_write_to_file(cc_path, "1", 1, false); | |
2139 | if (r < 0) | |
a8916143 | 2140 | SYSERROR("failed to set memory.use_hierarchy to 1; continuing"); |
2edb53c7 | 2141 | } |
1ea59ad2 SH |
2142 | free(cc_path); |
2143 | } | |
2edb53c7 | 2144 | } |
1ea59ad2 | 2145 | |
33ad9f1a CS |
2146 | /* if this is a cpuset hierarchy, we have to set cgroup.clone_children in |
2147 | * the base cgroup, otherwise containers will start with an empty cpuset.mems | |
2148 | * and cpuset.cpus and then | |
2149 | */ | |
2edb53c7 SH |
2150 | if (lxc_string_in_array("cpuset", (const char **)mp->hierarchy->subsystems)) { |
2151 | char *cc_path = cgroup_to_absolute_path(mp, cgroup_path, "/cgroup.clone_children"); | |
d703c2b1 RV |
2152 | struct stat sb; |
2153 | ||
33ad9f1a | 2154 | if (!cc_path) |
2edb53c7 | 2155 | return -1; |
d703c2b1 RV |
2156 | /* cgroup.clone_children is not available when running under |
2157 | * older kernel versions; in this case, we'll initialize | |
2158 | * cpuset.cpus and cpuset.mems later, after the new cgroup | |
2159 | * was created | |
2160 | */ | |
2161 | if (stat(cc_path, &sb) != 0 && errno == ENOENT) { | |
934b1673 | 2162 | mp->need_cpuset_init = true; |
d703c2b1 RV |
2163 | free(cc_path); |
2164 | return 0; | |
2165 | } | |
7e7243e1 SH |
2166 | r = lxc_read_from_file(cc_path, buf, 1); |
2167 | if (r == 1 && buf[0] == '1') { | |
2168 | free(cc_path); | |
2edb53c7 | 2169 | return 0; |
7e7243e1 | 2170 | } |
33ad9f1a | 2171 | r = lxc_write_to_file(cc_path, "1", 1, false); |
2edb53c7 SH |
2172 | saved_errno = errno; |
2173 | free(cc_path); | |
2174 | errno = saved_errno; | |
2175 | return r < 0 ? -1 : 0; | |
33ad9f1a CS |
2176 | } |
2177 | return 0; | |
b98f7d6e | 2178 | } |
484ed030 | 2179 | |
934b1673 | 2180 | static int cgroup_read_from_file(const char *fn, char buf[], size_t bufsize) |
d703c2b1 RV |
2181 | { |
2182 | int ret = lxc_read_from_file(fn, buf, bufsize); | |
2183 | if (ret < 0) { | |
2184 | SYSERROR("failed to read %s", fn); | |
934b1673 | 2185 | return ret; |
d703c2b1 RV |
2186 | } |
2187 | if (ret == bufsize) { | |
934b1673 SH |
2188 | if (bufsize > 0) { |
2189 | /* obviously this wasn't empty */ | |
2190 | buf[bufsize-1] = '\0'; | |
2191 | return ret; | |
2192 | } | |
2193 | /* Callers don't do this, but regression/sanity check */ | |
2194 | ERROR("%s: was not expecting 0 bufsize", __func__); | |
2195 | return -1; | |
d703c2b1 RV |
2196 | } |
2197 | buf[ret] = '\0'; | |
934b1673 | 2198 | return ret; |
d703c2b1 RV |
2199 | } |
2200 | ||
2201 | static bool do_init_cpuset_file(struct cgroup_mount_point *mp, | |
2202 | const char *path, const char *name) | |
2203 | { | |
934b1673 SH |
2204 | char value[1024]; |
2205 | char *childfile, *parentfile = NULL, *tmp; | |
2206 | int ret; | |
2207 | bool ok = false; | |
2208 | ||
d703c2b1 RV |
2209 | childfile = cgroup_to_absolute_path(mp, path, name); |
2210 | if (!childfile) | |
2211 | return false; | |
2212 | ||
2213 | /* don't overwrite a non-empty value in the file */ | |
934b1673 SH |
2214 | ret = cgroup_read_from_file(childfile, value, sizeof(value)); |
2215 | if (ret < 0) | |
2216 | goto out; | |
d703c2b1 | 2217 | if (value[0] != '\0' && value[0] != '\n') { |
934b1673 SH |
2218 | ok = true; |
2219 | goto out; | |
d703c2b1 RV |
2220 | } |
2221 | ||
2222 | /* path to the same name in the parent cgroup */ | |
2223 | parentfile = strdup(path); | |
2224 | if (!parentfile) | |
934b1673 SH |
2225 | goto out; |
2226 | ||
d703c2b1 | 2227 | tmp = strrchr(parentfile, '/'); |
934b1673 SH |
2228 | if (!tmp) |
2229 | goto out; | |
d703c2b1 RV |
2230 | if (tmp == parentfile) |
2231 | tmp++; /* keep the '/' at the start */ | |
2232 | *tmp = '\0'; | |
2233 | tmp = parentfile; | |
2234 | parentfile = cgroup_to_absolute_path(mp, tmp, name); | |
2235 | free(tmp); | |
934b1673 SH |
2236 | if (!parentfile) |
2237 | goto out; | |
d703c2b1 RV |
2238 | |
2239 | /* copy from parent to child cgroup */ | |
934b1673 SH |
2240 | ret = cgroup_read_from_file(parentfile, value, sizeof(value)); |
2241 | if (ret < 0) | |
2242 | goto out; | |
2243 | if (ret == sizeof(value)) { | |
2244 | /* If anyone actually sees this error, we can address it */ | |
2245 | ERROR("parent cpuset value too long"); | |
2246 | goto out; | |
d703c2b1 RV |
2247 | } |
2248 | ok = (lxc_write_to_file(childfile, value, strlen(value), false) >= 0); | |
2249 | if (!ok) | |
2250 | SYSERROR("failed writing %s", childfile); | |
b1dad6f6 RV |
2251 | |
2252 | out: | |
f10fad2f | 2253 | free(parentfile); |
d703c2b1 | 2254 | free(childfile); |
d703c2b1 RV |
2255 | return ok; |
2256 | } | |
2257 | ||
2258 | static bool init_cpuset_if_needed(struct cgroup_mount_point *mp, | |
2259 | const char *path) | |
2260 | { | |
2261 | /* the files we have to handle here are only in cpuset hierarchies */ | |
2262 | if (!lxc_string_in_array("cpuset", | |
2263 | (const char **)mp->hierarchy->subsystems)) | |
2264 | return true; | |
2265 | ||
b1dad6f6 RV |
2266 | if (!mp->need_cpuset_init) |
2267 | return true; | |
2268 | ||
d703c2b1 RV |
2269 | return (do_init_cpuset_file(mp, path, "/cpuset.cpus") && |
2270 | do_init_cpuset_file(mp, path, "/cpuset.mems") ); | |
2271 | } | |
2272 | ||
1a704014 CB |
2273 | static void print_cgfs_init_debuginfo(struct cgfs_data *d) |
2274 | { | |
2275 | int i; | |
2276 | ||
2277 | if (!getenv("LXC_DEBUG_CGFS")) | |
2278 | return; | |
2279 | ||
2280 | DEBUG("Cgroup information:"); | |
2281 | DEBUG(" container name: %s", d->name); | |
2282 | if (!d->meta || !d->meta->hierarchies) { | |
2283 | DEBUG(" No hierarchies found."); | |
2284 | return; | |
2285 | } | |
2286 | DEBUG(" Controllers:"); | |
2287 | for (i = 0; i <= d->meta->maximum_hierarchy; i++) { | |
2288 | char **p; | |
2289 | struct cgroup_hierarchy *h = d->meta->hierarchies[i]; | |
2290 | if (!h) { | |
2291 | DEBUG(" Empty hierarchy number %d.", i); | |
2292 | continue; | |
2293 | } | |
2294 | for (p = h->subsystems; p && *p; p++) { | |
2295 | DEBUG(" %2d: %s", i, *p); | |
2296 | } | |
2297 | } | |
2298 | } | |
2299 | ||
4fb3cba5 | 2300 | struct cgroup_ops *cgfs_ops_init(void) |
484ed030 | 2301 | { |
4fb3cba5 | 2302 | return &cgfs_ops; |
d4ef7c50 | 2303 | } |
484ed030 | 2304 | |
4fb3cba5 | 2305 | static void *cgfs_init(const char *name) |
d4ef7c50 | 2306 | { |
4fb3cba5 | 2307 | struct cgfs_data *d; |
484ed030 | 2308 | |
4fb3cba5 DE |
2309 | d = malloc(sizeof(*d)); |
2310 | if (!d) | |
2311 | return NULL; | |
484ed030 | 2312 | |
4fb3cba5 DE |
2313 | memset(d, 0, sizeof(*d)); |
2314 | d->name = strdup(name); | |
2315 | if (!d->name) | |
2316 | goto err1; | |
2317 | ||
5e1c5795 | 2318 | d->cgroup_pattern = lxc_global_config_value("lxc.cgroup.pattern"); |
4fb3cba5 DE |
2319 | |
2320 | d->meta = lxc_cgroup_load_meta(); | |
2321 | if (!d->meta) { | |
2322 | ERROR("cgroupfs failed to detect cgroup metadata"); | |
2323 | goto err2; | |
2324 | } | |
1a704014 CB |
2325 | |
2326 | print_cgfs_init_debuginfo(d); | |
2327 | ||
4fb3cba5 DE |
2328 | return d; |
2329 | ||
2330 | err2: | |
2331 | free(d->name); | |
2332 | err1: | |
2333 | free(d); | |
2334 | return NULL; | |
d4ef7c50 | 2335 | } |
484ed030 | 2336 | |
6a9e0f26 | 2337 | static void cgfs_destroy(void *hdata, struct lxc_conf *conf) |
d4ef7c50 | 2338 | { |
4fb3cba5 DE |
2339 | struct cgfs_data *d = hdata; |
2340 | ||
d4ef7c50 SH |
2341 | if (!d) |
2342 | return; | |
f10fad2f | 2343 | free(d->name); |
6a9e0f26 | 2344 | lxc_cgroup_process_info_free_and_remove(d->info, conf); |
c55d4505 | 2345 | lxc_cgroup_put_meta(d->meta); |
d4ef7c50 | 2346 | free(d); |
d4ef7c50 | 2347 | } |
484ed030 | 2348 | |
4fb3cba5 | 2349 | static inline bool cgfs_create(void *hdata) |
d4ef7c50 | 2350 | { |
4fb3cba5 DE |
2351 | struct cgfs_data *d = hdata; |
2352 | struct cgroup_process_info *i; | |
2353 | struct cgroup_meta_data *md; | |
484ed030 | 2354 | |
4fb3cba5 | 2355 | if (!d) |
d4ef7c50 | 2356 | return false; |
4fb3cba5 DE |
2357 | md = d->meta; |
2358 | i = lxc_cgroupfs_create(d->name, d->cgroup_pattern, md, NULL); | |
d4ef7c50 SH |
2359 | if (!i) |
2360 | return false; | |
2361 | d->info = i; | |
2362 | return true; | |
2363 | } | |
484ed030 | 2364 | |
4fb3cba5 | 2365 | static inline bool cgfs_enter(void *hdata, pid_t pid) |
d4ef7c50 | 2366 | { |
4fb3cba5 DE |
2367 | struct cgfs_data *d = hdata; |
2368 | struct cgroup_process_info *i; | |
d4ef7c50 | 2369 | int ret; |
4fb3cba5 DE |
2370 | |
2371 | if (!d) | |
2372 | return false; | |
2373 | i = d->info; | |
2374 | ret = lxc_cgroupfs_enter(i, pid, false); | |
484ed030 | 2375 | |
d4ef7c50 SH |
2376 | return ret == 0; |
2377 | } | |
2378 | ||
4fb3cba5 | 2379 | static inline bool cgfs_create_legacy(void *hdata, pid_t pid) |
d4ef7c50 | 2380 | { |
4fb3cba5 DE |
2381 | struct cgfs_data *d = hdata; |
2382 | struct cgroup_process_info *i; | |
2383 | ||
2384 | if (!d) | |
2385 | return false; | |
2386 | i = d->info; | |
2387 | if (lxc_cgroup_create_legacy(i, d->name, pid) < 0) { | |
2388 | ERROR("failed to create legacy ns cgroups for '%s'", d->name); | |
d4ef7c50 | 2389 | return false; |
484ed030 | 2390 | } |
d4ef7c50 SH |
2391 | return true; |
2392 | } | |
484ed030 | 2393 | |
4fb3cba5 | 2394 | static const char *cgfs_get_cgroup(void *hdata, const char *subsystem) |
d4ef7c50 | 2395 | { |
4fb3cba5 DE |
2396 | struct cgfs_data *d = hdata; |
2397 | ||
2398 | if (!d) | |
2399 | return NULL; | |
2400 | return lxc_cgroup_get_hierarchy_path_data(subsystem, d); | |
484ed030 SH |
2401 | } |
2402 | ||
ccb4cabe | 2403 | static bool cgfs_escape(void *hdata) |
06078509 TA |
2404 | { |
2405 | struct cgroup_meta_data *md; | |
2406 | int i; | |
2407 | bool ret = false; | |
2408 | ||
2409 | md = lxc_cgroup_load_meta(); | |
2410 | if (!md) | |
2411 | return false; | |
2412 | ||
2413 | for (i = 1; i <= md->maximum_hierarchy; i++) { | |
2414 | struct cgroup_hierarchy *h = md->hierarchies[i]; | |
2415 | struct cgroup_mount_point *mp; | |
2416 | char *tasks; | |
2417 | FILE *f; | |
2418 | int written; | |
2419 | ||
2420 | if (!h) { | |
2421 | WARN("not escaping hierarchy %d", i); | |
2422 | continue; | |
2423 | } | |
2424 | ||
2425 | mp = lxc_cgroup_find_mount_point(h, "/", true); | |
2426 | if (!mp) | |
2427 | goto out; | |
2428 | ||
2429 | tasks = cgroup_to_absolute_path(mp, "/", "tasks"); | |
2430 | if (!tasks) | |
2431 | goto out; | |
2432 | ||
2433 | f = fopen(tasks, "a"); | |
2434 | free(tasks); | |
2435 | if (!f) | |
2436 | goto out; | |
2437 | ||
2438 | written = fprintf(f, "%d\n", getpid()); | |
2439 | fclose(f); | |
2440 | if (written < 0) { | |
2441 | SYSERROR("writing tasks failed\n"); | |
2442 | goto out; | |
2443 | } | |
2444 | } | |
2445 | ||
2446 | ret = true; | |
2447 | out: | |
2448 | lxc_cgroup_put_meta(md); | |
2449 | return ret; | |
2450 | } | |
2451 | ||
36662416 TA |
2452 | static int cgfs_num_hierarchies(void) |
2453 | { | |
2454 | /* not implemented */ | |
2455 | return -1; | |
2456 | } | |
2457 | ||
2458 | static bool cgfs_get_hierarchies(int i, char ***out) | |
2459 | { | |
2460 | /* not implemented */ | |
2461 | return false; | |
2462 | } | |
2463 | ||
4fb3cba5 | 2464 | static bool cgfs_unfreeze(void *hdata) |
0086f499 | 2465 | { |
4fb3cba5 | 2466 | struct cgfs_data *d = hdata; |
0086f499 SH |
2467 | char *cgabspath, *cgrelpath; |
2468 | int ret; | |
2469 | ||
4fb3cba5 DE |
2470 | if (!d) |
2471 | return false; | |
2472 | ||
2473 | cgrelpath = lxc_cgroup_get_hierarchy_path_data("freezer", d); | |
0086f499 SH |
2474 | cgabspath = lxc_cgroup_find_abs_path("freezer", cgrelpath, true, NULL); |
2475 | if (!cgabspath) | |
ecfcb3f0 | 2476 | return false; |
0086f499 SH |
2477 | |
2478 | ret = do_cgroup_set(cgabspath, "freezer.state", "THAWED"); | |
2479 | free(cgabspath); | |
ecfcb3f0 | 2480 | return ret == 0; |
0086f499 SH |
2481 | } |
2482 | ||
4fb3cba5 DE |
2483 | static bool cgroupfs_setup_limits(void *hdata, struct lxc_list *cgroup_conf, |
2484 | bool with_devices) | |
9daf6f5d | 2485 | { |
4fb3cba5 DE |
2486 | struct cgfs_data *d = hdata; |
2487 | ||
2488 | if (!d) | |
2489 | return false; | |
2490 | return do_setup_cgroup_limits(d, cgroup_conf, with_devices) == 0; | |
9daf6f5d SH |
2491 | } |
2492 | ||
4fb3cba5 | 2493 | static bool lxc_cgroupfs_attach(const char *name, const char *lxcpath, pid_t pid) |
5d897655 SH |
2494 | { |
2495 | struct cgroup_meta_data *meta_data; | |
2496 | struct cgroup_process_info *container_info; | |
2497 | int ret; | |
2498 | ||
2499 | meta_data = lxc_cgroup_load_meta(); | |
2500 | if (!meta_data) { | |
2501 | ERROR("could not move attached process %d to cgroup of container", pid); | |
2502 | return false; | |
2503 | } | |
2504 | ||
2505 | container_info = lxc_cgroup_get_container_info(name, lxcpath, meta_data); | |
2506 | lxc_cgroup_put_meta(meta_data); | |
2507 | if (!container_info) { | |
2508 | ERROR("could not move attached process %d to cgroup of container", pid); | |
2509 | return false; | |
2510 | } | |
2511 | ||
2512 | ret = lxc_cgroupfs_enter(container_info, pid, false); | |
2513 | lxc_cgroup_process_info_free(container_info); | |
2514 | if (ret < 0) { | |
2515 | ERROR("could not move attached process %d to cgroup of container", pid); | |
2516 | return false; | |
2517 | } | |
2518 | return true; | |
2519 | } | |
2520 | ||
8b276860 SH |
2521 | struct chown_data { |
2522 | const char *cgroup_path; | |
2523 | uid_t origuid; | |
2524 | }; | |
2525 | ||
2526 | /* | |
2527 | * TODO - someone should refactor this to unshare once passing all the paths | |
2528 | * to be chowned in one go | |
2529 | */ | |
2530 | static int chown_cgroup_wrapper(void *data) | |
2531 | { | |
2532 | struct chown_data *arg = data; | |
2533 | uid_t destuid; | |
2534 | char *fpath; | |
2535 | ||
8b276860 SH |
2536 | if (setresgid(0,0,0) < 0) |
2537 | SYSERROR("Failed to setgid to 0"); | |
2538 | if (setresuid(0,0,0) < 0) | |
2539 | SYSERROR("Failed to setuid to 0"); | |
2540 | if (setgroups(0, NULL) < 0) | |
2541 | SYSERROR("Failed to clear groups"); | |
2542 | destuid = get_ns_uid(arg->origuid); | |
2543 | ||
2544 | if (chown(arg->cgroup_path, destuid, 0) < 0) | |
2545 | SYSERROR("Failed chowning %s to %d", arg->cgroup_path, (int)destuid); | |
2546 | ||
2547 | fpath = lxc_append_paths(arg->cgroup_path, "tasks"); | |
2548 | if (!fpath) | |
2549 | return -1; | |
2550 | if (chown(fpath, destuid, 0) < 0) | |
2551 | SYSERROR("Error chowning %s\n", fpath); | |
2552 | free(fpath); | |
01d59fe5 | 2553 | |
8b276860 SH |
2554 | fpath = lxc_append_paths(arg->cgroup_path, "cgroup.procs"); |
2555 | if (!fpath) | |
2556 | return -1; | |
2557 | if (chown(fpath, destuid, 0) < 0) | |
2558 | SYSERROR("Error chowning %s", fpath); | |
2559 | free(fpath); | |
2560 | ||
2561 | return 0; | |
2562 | } | |
2563 | ||
2564 | static bool do_cgfs_chown(char *cgroup_path, struct lxc_conf *conf) | |
2565 | { | |
2566 | struct chown_data data; | |
2567 | char *fpath; | |
2568 | ||
01d59fe5 CB |
2569 | if (!dir_exists(cgroup_path)) |
2570 | return true; | |
2571 | ||
8b276860 SH |
2572 | if (lxc_list_empty(&conf->id_map)) |
2573 | /* If there's no mapping then we don't need to chown */ | |
2574 | return true; | |
2575 | ||
2576 | data.cgroup_path = cgroup_path; | |
2577 | data.origuid = geteuid(); | |
2578 | ||
2579 | /* Unpriv users can't chown it themselves, so chown from | |
2580 | * a child namespace mapping both our own and the target uid | |
2581 | */ | |
2582 | if (userns_exec_1(conf, chown_cgroup_wrapper, &data) < 0) { | |
2583 | ERROR("Error requesting cgroup chown in new namespace"); | |
2584 | return false; | |
2585 | } | |
2586 | ||
2587 | /* | |
2588 | * Now chmod 775 the directory else the container cannot create cgroups. | |
2589 | * This can't be done in the child namespace because it only group-owns | |
2590 | * the cgroup | |
2591 | */ | |
2592 | if (chmod(cgroup_path, 0775) < 0) { | |
2593 | SYSERROR("Error chmoding %s\n", cgroup_path); | |
2594 | return false; | |
2595 | } | |
2596 | fpath = lxc_append_paths(cgroup_path, "tasks"); | |
2597 | if (!fpath) | |
2598 | return false; | |
2599 | if (chmod(fpath, 0664) < 0) | |
2600 | SYSERROR("Error chmoding %s\n", fpath); | |
2601 | free(fpath); | |
2602 | fpath = lxc_append_paths(cgroup_path, "cgroup.procs"); | |
2603 | if (!fpath) | |
2604 | return false; | |
2605 | if (chmod(fpath, 0664) < 0) | |
2606 | SYSERROR("Error chmoding %s\n", fpath); | |
2607 | free(fpath); | |
2608 | ||
2609 | return true; | |
2610 | } | |
2611 | ||
2612 | static bool cgfs_chown(void *hdata, struct lxc_conf *conf) | |
2613 | { | |
2614 | struct cgfs_data *d = hdata; | |
2615 | struct cgroup_process_info *info_ptr; | |
2616 | char *cgpath; | |
2617 | bool r = true; | |
2618 | ||
2619 | if (!d) | |
2620 | return false; | |
2621 | ||
2622 | for (info_ptr = d->info; info_ptr; info_ptr = info_ptr->next) { | |
2623 | if (!info_ptr->designated_mount_point) { | |
2624 | info_ptr->designated_mount_point = lxc_cgroup_find_mount_point(info_ptr->hierarchy, info_ptr->cgroup_path, true); | |
2625 | if (!info_ptr->designated_mount_point) { | |
2626 | SYSERROR("Could not chown cgroup %s: internal error (couldn't find any writable mountpoint to cgroup filesystem)", info_ptr->cgroup_path); | |
2627 | return false; | |
2628 | } | |
2629 | } | |
2630 | ||
2631 | cgpath = cgroup_to_absolute_path(info_ptr->designated_mount_point, info_ptr->cgroup_path, NULL); | |
2632 | if (!cgpath) { | |
2633 | SYSERROR("Could not chown cgroup %s: internal error", info_ptr->cgroup_path); | |
2634 | continue; | |
2635 | } | |
2636 | r = do_cgfs_chown(cgpath, conf); | |
ea439aac | 2637 | if (!r && is_crucial_hierarchy(info_ptr->hierarchy)) { |
8b276860 SH |
2638 | ERROR("Failed chowning %s\n", cgpath); |
2639 | free(cgpath); | |
2640 | return false; | |
2641 | } | |
2642 | free(cgpath); | |
2643 | } | |
2644 | ||
2645 | return true; | |
2646 | } | |
2647 | ||
d4ef7c50 | 2648 | static struct cgroup_ops cgfs_ops = { |
d4ef7c50 | 2649 | .init = cgfs_init, |
4fb3cba5 | 2650 | .destroy = cgfs_destroy, |
d4ef7c50 SH |
2651 | .create = cgfs_create, |
2652 | .enter = cgfs_enter, | |
2653 | .create_legacy = cgfs_create_legacy, | |
2654 | .get_cgroup = cgfs_get_cgroup, | |
06078509 | 2655 | .escape = cgfs_escape, |
36662416 TA |
2656 | .num_hierarchies = cgfs_num_hierarchies, |
2657 | .get_hierarchies = cgfs_get_hierarchies, | |
d4ef7c50 SH |
2658 | .get = lxc_cgroupfs_get, |
2659 | .set = lxc_cgroupfs_set, | |
4fb3cba5 | 2660 | .unfreeze = cgfs_unfreeze, |
9daf6f5d | 2661 | .setup_limits = cgroupfs_setup_limits, |
d4ef7c50 | 2662 | .name = "cgroupfs", |
5d897655 | 2663 | .attach = lxc_cgroupfs_attach, |
8b276860 | 2664 | .chown = cgfs_chown, |
c476bdce | 2665 | .mount_cgroup = cgroupfs_mount_cgroup, |
4fb3cba5 | 2666 | .nrtasks = cgfs_nrtasks, |
23befb18 | 2667 | .driver = CGFS, |
d4ef7c50 | 2668 | }; |