src/core/cgroup.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2013 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <fcntl.h>
  21 #include <fnmatch.h>
  22
  23 #include "alloc-util.h"
  24 #include "cgroup-util.h"
  25 #include "cgroup.h"
  26 #include "fd-util.h"
  27 #include "fileio.h"
  28 #include "fs-util.h"
  29 #include "parse-util.h"
  30 #include "path-util.h"
  31 #include "process-util.h"
  32 //#include "special.h"
  33 #include "string-table.h"
  34 #include "string-util.h"
  35 #include "stdio-util.h"
  36
  37 #define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
  38
  39 #if 0 /// UNNEEDED by elogind
  40 static void cgroup_compat_warn(void) {
  41         static bool cgroup_compat_warned = false;
  42
  43         if (cgroup_compat_warned)
  44                 return;
  45
  46         log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. See cgroup-compat debug messages for details.");
  47         cgroup_compat_warned = true;
  48 }
  49
  50 #define log_cgroup_compat(unit, fmt, ...) do {                                  \
  51                 cgroup_compat_warn();                                           \
  52                 log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__);     \
  53         } while (false)
  54
  55 void cgroup_context_init(CGroupContext *c) {
  56         assert(c);
  57
  58         /* Initialize everything to the kernel defaults, assuming the
  59          * structure is preinitialized to 0 */
  60
  61         c->cpu_weight = CGROUP_WEIGHT_INVALID;
  62         c->startup_cpu_weight = CGROUP_WEIGHT_INVALID;
  63         c->cpu_quota_per_sec_usec = USEC_INFINITY;
  64
  65         c->cpu_shares = CGROUP_CPU_SHARES_INVALID;
  66         c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID;
  67
  68         c->memory_high = CGROUP_LIMIT_MAX;
  69         c->memory_max = CGROUP_LIMIT_MAX;
  70         c->memory_swap_max = CGROUP_LIMIT_MAX;
  71
  72         c->memory_limit = CGROUP_LIMIT_MAX;
  73
  74         c->io_weight = CGROUP_WEIGHT_INVALID;
  75         c->startup_io_weight = CGROUP_WEIGHT_INVALID;
  76
  77         c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
  78         c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID;
  79
  80         c->tasks_max = (uint64_t) -1;
  81 }
  82
  83 void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
  84         assert(c);
  85         assert(a);
  86
  87         LIST_REMOVE(device_allow, c->device_allow, a);
  88         free(a->path);
  89         free(a);
  90 }
  91
  92 void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) {
  93         assert(c);
  94         assert(w);
  95
  96         LIST_REMOVE(device_weights, c->io_device_weights, w);
  97         free(w->path);
  98         free(w);
  99 }
 100
 101 void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) {
 102         assert(c);
 103         assert(l);
 104
 105         LIST_REMOVE(device_limits, c->io_device_limits, l);
 106         free(l->path);
 107         free(l);
 108 }
 109
 110 void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) {
 111         assert(c);
 112         assert(w);
 113
 114         LIST_REMOVE(device_weights, c->blockio_device_weights, w);
 115         free(w->path);
 116         free(w);
 117 }
 118
 119 void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) {
 120         assert(c);
 121         assert(b);
 122
 123         LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b);
 124         free(b->path);
 125         free(b);
 126 }
 127
 128 void cgroup_context_done(CGroupContext *c) {
 129         assert(c);
 130
 131         while (c->io_device_weights)
 132                 cgroup_context_free_io_device_weight(c, c->io_device_weights);
 133
 134         while (c->io_device_limits)
 135                 cgroup_context_free_io_device_limit(c, c->io_device_limits);
 136
 137         while (c->blockio_device_weights)
 138                 cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
 139
 140         while (c->blockio_device_bandwidths)
 141                 cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths);
 142
 143         while (c->device_allow)
 144                 cgroup_context_free_device_allow(c, c->device_allow);
 145 }
 146
 147 void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) {
 148         CGroupIODeviceLimit *il;
 149         CGroupIODeviceWeight *iw;
 150         CGroupBlockIODeviceBandwidth *b;
 151         CGroupBlockIODeviceWeight *w;
 152         CGroupDeviceAllow *a;
 153         char u[FORMAT_TIMESPAN_MAX];
 154
 155         assert(c);
 156         assert(f);
 157
 158         prefix = strempty(prefix);
 159
 160         fprintf(f,
 161                 "%sCPUAccounting=%s\n"
 162                 "%sIOAccounting=%s\n"
 163                 "%sBlockIOAccounting=%s\n"
 164                 "%sMemoryAccounting=%s\n"
 165                 "%sTasksAccounting=%s\n"
 166                 "%sCPUWeight=%" PRIu64 "\n"
 167                 "%sStartupCPUWeight=%" PRIu64 "\n"
 168                 "%sCPUShares=%" PRIu64 "\n"
 169                 "%sStartupCPUShares=%" PRIu64 "\n"
 170                 "%sCPUQuotaPerSecSec=%s\n"
 171                 "%sIOWeight=%" PRIu64 "\n"
 172                 "%sStartupIOWeight=%" PRIu64 "\n"
 173                 "%sBlockIOWeight=%" PRIu64 "\n"
 174                 "%sStartupBlockIOWeight=%" PRIu64 "\n"
 175                 "%sMemoryLow=%" PRIu64 "\n"
 176                 "%sMemoryHigh=%" PRIu64 "\n"
 177                 "%sMemoryMax=%" PRIu64 "\n"
 178                 "%sMemorySwapMax=%" PRIu64 "\n"
 179                 "%sMemoryLimit=%" PRIu64 "\n"
 180                 "%sTasksMax=%" PRIu64 "\n"
 181                 "%sDevicePolicy=%s\n"
 182                 "%sDelegate=%s\n",
 183                 prefix, yes_no(c->cpu_accounting),
 184                 prefix, yes_no(c->io_accounting),
 185                 prefix, yes_no(c->blockio_accounting),
 186                 prefix, yes_no(c->memory_accounting),
 187                 prefix, yes_no(c->tasks_accounting),
 188                 prefix, c->cpu_weight,
 189                 prefix, c->startup_cpu_weight,
 190                 prefix, c->cpu_shares,
 191                 prefix, c->startup_cpu_shares,
 192                 prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1),
 193                 prefix, c->io_weight,
 194                 prefix, c->startup_io_weight,
 195                 prefix, c->blockio_weight,
 196                 prefix, c->startup_blockio_weight,
 197                 prefix, c->memory_low,
 198                 prefix, c->memory_high,
 199                 prefix, c->memory_max,
 200                 prefix, c->memory_swap_max,
 201                 prefix, c->memory_limit,
 202                 prefix, c->tasks_max,
 203                 prefix, cgroup_device_policy_to_string(c->device_policy),
 204                 prefix, yes_no(c->delegate));
 205
 206         LIST_FOREACH(device_allow, a, c->device_allow)
 207                 fprintf(f,
 208                         "%sDeviceAllow=%s %s%s%s\n",
 209                         prefix,
 210                         a->path,
 211                         a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : "");
 212
 213         LIST_FOREACH(device_weights, iw, c->io_device_weights)
 214                 fprintf(f,
 215                         "%sIODeviceWeight=%s %" PRIu64,
 216                         prefix,
 217                         iw->path,
 218                         iw->weight);
 219
 220         LIST_FOREACH(device_limits, il, c->io_device_limits) {
 221                 char buf[FORMAT_BYTES_MAX];
 222                 CGroupIOLimitType type;
 223
 224                 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
 225                         if (il->limits[type] != cgroup_io_limit_defaults[type])
 226                                 fprintf(f,
 227                                         "%s%s=%s %s\n",
 228                                         prefix,
 229                                         cgroup_io_limit_type_to_string(type),
 230                                         il->path,
 231                                         format_bytes(buf, sizeof(buf), il->limits[type]));
 232         }
 233
 234         LIST_FOREACH(device_weights, w, c->blockio_device_weights)
 235                 fprintf(f,
 236                         "%sBlockIODeviceWeight=%s %" PRIu64,
 237                         prefix,
 238                         w->path,
 239                         w->weight);
 240
 241         LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
 242                 char buf[FORMAT_BYTES_MAX];
 243
 244                 if (b->rbps != CGROUP_LIMIT_MAX)
 245                         fprintf(f,
 246                                 "%sBlockIOReadBandwidth=%s %s\n",
 247                                 prefix,
 248                                 b->path,
 249                                 format_bytes(buf, sizeof(buf), b->rbps));
 250                 if (b->wbps != CGROUP_LIMIT_MAX)
 251                         fprintf(f,
 252                                 "%sBlockIOWriteBandwidth=%s %s\n",
 253                                 prefix,
 254                                 b->path,
 255                                 format_bytes(buf, sizeof(buf), b->wbps));
 256         }
 257 }
 258
 259 static int lookup_block_device(const char *p, dev_t *dev) {
 260         struct stat st;
 261         int r;
 262
 263         assert(p);
 264         assert(dev);
 265
 266         r = stat(p, &st);
 267         if (r < 0)
 268                 return log_warning_errno(errno, "Couldn't stat device %s: %m", p);
 269
 270         if (S_ISBLK(st.st_mode))
 271                 *dev = st.st_rdev;
 272         else if (major(st.st_dev) != 0) {
 273                 /* If this is not a device node then find the block
 274                  * device this file is stored on */
 275                 *dev = st.st_dev;
 276
 277                 /* If this is a partition, try to get the originating
 278                  * block device */
 279                 block_get_whole_disk(*dev, dev);
 280         } else {
 281                 log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p);
 282                 return -ENODEV;
 283         }
 284
 285         return 0;
 286 }
 287
 288 static int whitelist_device(const char *path, const char *node, const char *acc) {
 289         char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4];
 290         struct stat st;
 291         bool ignore_notfound;
 292         int r;
 293
 294         assert(path);
 295         assert(acc);
 296
 297         if (node[0] == '-') {
 298                 /* Non-existent paths starting with "-" must be silently ignored */
 299                 node++;
 300                 ignore_notfound = true;
 301         } else
 302                 ignore_notfound = false;
 303
 304         if (stat(node, &st) < 0) {
 305                 if (errno == ENOENT && ignore_notfound)
 306                         return 0;
 307
 308                 return log_warning_errno(errno, "Couldn't stat device %s: %m", node);
 309         }
 310
 311         if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
 312                 log_warning("%s is not a device.", node);
 313                 return -ENODEV;
 314         }
 315
 316         sprintf(buf,
 317                 "%c %u:%u %s",
 318                 S_ISCHR(st.st_mode) ? 'c' : 'b',
 319                 major(st.st_rdev), minor(st.st_rdev),
 320                 acc);
 321
 322         r = cg_set_attribute("devices", path, "devices.allow", buf);
 323         if (r < 0)
 324                 log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 325                                "Failed to set devices.allow on %s: %m", path);
 326
 327         return r;
 328 }
 329
 330 static int whitelist_major(const char *path, const char *name, char type, const char *acc) {
 331         _cleanup_fclose_ FILE *f = NULL;
 332         char line[LINE_MAX];
 333         bool good = false;
 334         int r;
 335
 336         assert(path);
 337         assert(acc);
 338         assert(type == 'b' || type == 'c');
 339
 340         f = fopen("/proc/devices", "re");
 341         if (!f)
 342                 return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type);
 343
 344         FOREACH_LINE(line, f, goto fail) {
 345                 char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w;
 346                 unsigned maj;
 347
 348                 truncate_nl(line);
 349
 350                 if (type == 'c' && streq(line, "Character devices:")) {
 351                         good = true;
 352                         continue;
 353                 }
 354
 355                 if (type == 'b' && streq(line, "Block devices:")) {
 356                         good = true;
 357                         continue;
 358                 }
 359
 360                 if (isempty(line)) {
 361                         good = false;
 362                         continue;
 363                 }
 364
 365                 if (!good)
 366                         continue;
 367
 368                 p = strstrip(line);
 369
 370                 w = strpbrk(p, WHITESPACE);
 371                 if (!w)
 372                         continue;
 373                 *w = 0;
 374
 375                 r = safe_atou(p, &maj);
 376                 if (r < 0)
 377                         continue;
 378                 if (maj <= 0)
 379                         continue;
 380
 381                 w++;
 382                 w += strspn(w, WHITESPACE);
 383
 384                 if (fnmatch(name, w, 0) != 0)
 385                         continue;
 386
 387                 sprintf(buf,
 388                         "%c %u:* %s",
 389                         type,
 390                         maj,
 391                         acc);
 392
 393                 r = cg_set_attribute("devices", path, "devices.allow", buf);
 394                 if (r < 0)
 395                         log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 396                                        "Failed to set devices.allow on %s: %m", path);
 397         }
 398
 399         return 0;
 400
 401 fail:
 402         log_warning_errno(errno, "Failed to read /proc/devices: %m");
 403         return -errno;
 404 }
 405
 406 static bool cgroup_context_has_cpu_weight(CGroupContext *c) {
 407         return c->cpu_weight != CGROUP_WEIGHT_INVALID ||
 408                 c->startup_cpu_weight != CGROUP_WEIGHT_INVALID;
 409 }
 410
 411 static bool cgroup_context_has_cpu_shares(CGroupContext *c) {
 412         return c->cpu_shares != CGROUP_CPU_SHARES_INVALID ||
 413                 c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID;
 414 }
 415
 416 static uint64_t cgroup_context_cpu_weight(CGroupContext *c, ManagerState state) {
 417         if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
 418             c->startup_cpu_weight != CGROUP_WEIGHT_INVALID)
 419                 return c->startup_cpu_weight;
 420         else if (c->cpu_weight != CGROUP_WEIGHT_INVALID)
 421                 return c->cpu_weight;
 422         else
 423                 return CGROUP_WEIGHT_DEFAULT;
 424 }
 425
 426 static uint64_t cgroup_context_cpu_shares(CGroupContext *c, ManagerState state) {
 427         if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
 428             c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID)
 429                 return c->startup_cpu_shares;
 430         else if (c->cpu_shares != CGROUP_CPU_SHARES_INVALID)
 431                 return c->cpu_shares;
 432         else
 433                 return CGROUP_CPU_SHARES_DEFAULT;
 434 }
 435
 436 static void cgroup_apply_unified_cpu_config(Unit *u, uint64_t weight, uint64_t quota) {
 437         char buf[MAX(DECIMAL_STR_MAX(uint64_t) + 1, (DECIMAL_STR_MAX(usec_t) + 1) * 2)];
 438         int r;
 439
 440         xsprintf(buf, "%" PRIu64 "\n", weight);
 441         r = cg_set_attribute("cpu", u->cgroup_path, "cpu.weight", buf);
 442         if (r < 0)
 443                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 444                               "Failed to set cpu.weight: %m");
 445
 446         if (quota != USEC_INFINITY)
 447                 xsprintf(buf, USEC_FMT " " USEC_FMT "\n",
 448                          quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC, CGROUP_CPU_QUOTA_PERIOD_USEC);
 449         else
 450                 xsprintf(buf, "max " USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
 451
 452         r = cg_set_attribute("cpu", u->cgroup_path, "cpu.max", buf);
 453
 454         if (r < 0)
 455                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 456                               "Failed to set cpu.max: %m");
 457 }
 458
 459 static void cgroup_apply_legacy_cpu_config(Unit *u, uint64_t shares, uint64_t quota) {
 460         char buf[MAX(DECIMAL_STR_MAX(uint64_t), DECIMAL_STR_MAX(usec_t)) + 1];
 461         int r;
 462
 463         xsprintf(buf, "%" PRIu64 "\n", shares);
 464         r = cg_set_attribute("cpu", u->cgroup_path, "cpu.shares", buf);
 465         if (r < 0)
 466                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 467                               "Failed to set cpu.shares: %m");
 468
 469         xsprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC);
 470         r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_period_us", buf);
 471         if (r < 0)
 472                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 473                               "Failed to set cpu.cfs_period_us: %m");
 474
 475         if (quota != USEC_INFINITY) {
 476                 xsprintf(buf, USEC_FMT "\n", quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC);
 477                 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", buf);
 478         } else
 479                 r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", "-1");
 480         if (r < 0)
 481                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 482                               "Failed to set cpu.cfs_quota_us: %m");
 483 }
 484
 485 static uint64_t cgroup_cpu_shares_to_weight(uint64_t shares) {
 486         return CLAMP(shares * CGROUP_WEIGHT_DEFAULT / CGROUP_CPU_SHARES_DEFAULT,
 487                      CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
 488 }
 489
 490 static uint64_t cgroup_cpu_weight_to_shares(uint64_t weight) {
 491         return CLAMP(weight * CGROUP_CPU_SHARES_DEFAULT / CGROUP_WEIGHT_DEFAULT,
 492                      CGROUP_CPU_SHARES_MIN, CGROUP_CPU_SHARES_MAX);
 493 }
 494
 495 static bool cgroup_context_has_io_config(CGroupContext *c) {
 496         return c->io_accounting ||
 497                 c->io_weight != CGROUP_WEIGHT_INVALID ||
 498                 c->startup_io_weight != CGROUP_WEIGHT_INVALID ||
 499                 c->io_device_weights ||
 500                 c->io_device_limits;
 501 }
 502
 503 static bool cgroup_context_has_blockio_config(CGroupContext *c) {
 504         return c->blockio_accounting ||
 505                 c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
 506                 c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
 507                 c->blockio_device_weights ||
 508                 c->blockio_device_bandwidths;
 509 }
 510
 511 static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) {
 512         if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
 513             c->startup_io_weight != CGROUP_WEIGHT_INVALID)
 514                 return c->startup_io_weight;
 515         else if (c->io_weight != CGROUP_WEIGHT_INVALID)
 516                 return c->io_weight;
 517         else
 518                 return CGROUP_WEIGHT_DEFAULT;
 519 }
 520
 521 static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) {
 522         if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
 523             c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
 524                 return c->startup_blockio_weight;
 525         else if (c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
 526                 return c->blockio_weight;
 527         else
 528                 return CGROUP_BLKIO_WEIGHT_DEFAULT;
 529 }
 530
 531 static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) {
 532         return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT,
 533                      CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
 534 }
 535
 536 static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) {
 537         return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT,
 538                      CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX);
 539 }
 540
 541 static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) {
 542         char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
 543         dev_t dev;
 544         int r;
 545
 546         r = lookup_block_device(dev_path, &dev);
 547         if (r < 0)
 548                 return;
 549
 550         xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight);
 551         r = cg_set_attribute("io", u->cgroup_path, "io.weight", buf);
 552         if (r < 0)
 553                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 554                               "Failed to set io.weight: %m");
 555 }
 556
 557 static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) {
 558         char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
 559         dev_t dev;
 560         int r;
 561
 562         r = lookup_block_device(dev_path, &dev);
 563         if (r < 0)
 564                 return;
 565
 566         xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight);
 567         r = cg_set_attribute("blkio", u->cgroup_path, "blkio.weight_device", buf);
 568         if (r < 0)
 569                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 570                               "Failed to set blkio.weight_device: %m");
 571 }
 572
 573 static unsigned cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) {
 574         char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)];
 575         char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
 576         CGroupIOLimitType type;
 577         dev_t dev;
 578         unsigned n = 0;
 579         int r;
 580
 581         r = lookup_block_device(dev_path, &dev);
 582         if (r < 0)
 583                 return 0;
 584
 585         for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) {
 586                 if (limits[type] != cgroup_io_limit_defaults[type]) {
 587                         xsprintf(limit_bufs[type], "%" PRIu64, limits[type]);
 588                         n++;
 589                 } else {
 590                         xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0");
 591                 }
 592         }
 593
 594         xsprintf(buf, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev), minor(dev),
 595                  limit_bufs[CGROUP_IO_RBPS_MAX], limit_bufs[CGROUP_IO_WBPS_MAX],
 596                  limit_bufs[CGROUP_IO_RIOPS_MAX], limit_bufs[CGROUP_IO_WIOPS_MAX]);
 597         r = cg_set_attribute("io", u->cgroup_path, "io.max", buf);
 598         if (r < 0)
 599                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 600                               "Failed to set io.max: %m");
 601         return n;
 602 }
 603
 604 static unsigned cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) {
 605         char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
 606         dev_t dev;
 607         unsigned n = 0;
 608         int r;
 609
 610         r = lookup_block_device(dev_path, &dev);
 611         if (r < 0)
 612                 return 0;
 613
 614         if (rbps != CGROUP_LIMIT_MAX)
 615                 n++;
 616         sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps);
 617         r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.read_bps_device", buf);
 618         if (r < 0)
 619                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 620                               "Failed to set blkio.throttle.read_bps_device: %m");
 621
 622         if (wbps != CGROUP_LIMIT_MAX)
 623                 n++;
 624         sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps);
 625         r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.write_bps_device", buf);
 626         if (r < 0)
 627                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 628                               "Failed to set blkio.throttle.write_bps_device: %m");
 629
 630         return n;
 631 }
 632
 633 static bool cgroup_context_has_unified_memory_config(CGroupContext *c) {
 634         return c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX || c->memory_swap_max != CGROUP_LIMIT_MAX;
 635 }
 636
 637 static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
 638         char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max";
 639         int r;
 640
 641         if (v != CGROUP_LIMIT_MAX)
 642                 xsprintf(buf, "%" PRIu64 "\n", v);
 643
 644         r = cg_set_attribute("memory", u->cgroup_path, file, buf);
 645         if (r < 0)
 646                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 647                               "Failed to set %s: %m", file);
 648 }
 649
 650 static void cgroup_context_apply(Unit *u, CGroupMask mask, ManagerState state) {
 651         const char *path;
 652         CGroupContext *c;
 653         bool is_root;
 654         int r;
 655
 656         assert(u);
 657
 658         c = unit_get_cgroup_context(u);
 659         path = u->cgroup_path;
 660
 661         assert(c);
 662         assert(path);
 663
 664         if (mask == 0)
 665                 return;
 666
 667         /* Some cgroup attributes are not supported on the root cgroup,
 668          * hence silently ignore */
 669         is_root = isempty(path) || path_equal(path, "/");
 670         if (is_root)
 671                 /* Make sure we don't try to display messages with an empty path. */
 672                 path = "/";
 673
 674         /* We generally ignore errors caused by read-only mounted
 675          * cgroup trees (assuming we are running in a container then),
 676          * and missing cgroups, i.e. EROFS and ENOENT. */
 677
 678         if ((mask & CGROUP_MASK_CPU) && !is_root) {
 679                 bool has_weight = cgroup_context_has_cpu_weight(c);
 680                 bool has_shares = cgroup_context_has_cpu_shares(c);
 681
 682                 if (cg_all_unified()) {
 683                         uint64_t weight;
 684
 685                         if (has_weight)
 686                                 weight = cgroup_context_cpu_weight(c, state);
 687                         else if (has_shares) {
 688                                 uint64_t shares = cgroup_context_cpu_shares(c, state);
 689
 690                                 weight = cgroup_cpu_shares_to_weight(shares);
 691
 692                                 log_cgroup_compat(u, "Applying [Startup]CpuShares %" PRIu64 " as [Startup]CpuWeight %" PRIu64 " on %s",
 693                                                   shares, weight, path);
 694                         } else
 695                                 weight = CGROUP_WEIGHT_DEFAULT;
 696
 697                         cgroup_apply_unified_cpu_config(u, weight, c->cpu_quota_per_sec_usec);
 698                 } else {
 699                         uint64_t shares;
 700
 701                         if (has_weight) {
 702                                 uint64_t weight = cgroup_context_cpu_weight(c, state);
 703
 704                                 shares = cgroup_cpu_weight_to_shares(weight);
 705
 706                                 log_cgroup_compat(u, "Applying [Startup]CpuWeight %" PRIu64 " as [Startup]CpuShares %" PRIu64 " on %s",
 707                                                   weight, shares, path);
 708                         } else if (has_shares)
 709                                 shares = cgroup_context_cpu_shares(c, state);
 710                         else
 711                                 shares = CGROUP_CPU_SHARES_DEFAULT;
 712
 713                         cgroup_apply_legacy_cpu_config(u, shares, c->cpu_quota_per_sec_usec);
 714                 }
 715         }
 716
 717         if (mask & CGROUP_MASK_IO) {
 718                 bool has_io = cgroup_context_has_io_config(c);
 719                 bool has_blockio = cgroup_context_has_blockio_config(c);
 720
 721                 if (!is_root) {
 722                         char buf[8+DECIMAL_STR_MAX(uint64_t)+1];
 723                         uint64_t weight;
 724
 725                         if (has_io)
 726                                 weight = cgroup_context_io_weight(c, state);
 727                         else if (has_blockio) {
 728                                 uint64_t blkio_weight = cgroup_context_blkio_weight(c, state);
 729
 730                                 weight = cgroup_weight_blkio_to_io(blkio_weight);
 731
 732                                 log_cgroup_compat(u, "Applying [Startup]BlockIOWeight %" PRIu64 " as [Startup]IOWeight %" PRIu64,
 733                                                   blkio_weight, weight);
 734                         } else
 735                                 weight = CGROUP_WEIGHT_DEFAULT;
 736
 737                         xsprintf(buf, "default %" PRIu64 "\n", weight);
 738                         r = cg_set_attribute("io", path, "io.weight", buf);
 739                         if (r < 0)
 740                                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 741                                               "Failed to set io.weight: %m");
 742
 743                         if (has_io) {
 744                                 CGroupIODeviceWeight *w;
 745
 746                                 /* FIXME: no way to reset this list */
 747                                 LIST_FOREACH(device_weights, w, c->io_device_weights)
 748                                         cgroup_apply_io_device_weight(u, w->path, w->weight);
 749                         } else if (has_blockio) {
 750                                 CGroupBlockIODeviceWeight *w;
 751
 752                                 /* FIXME: no way to reset this list */
 753                                 LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
 754                                         weight = cgroup_weight_blkio_to_io(w->weight);
 755
 756                                         log_cgroup_compat(u, "Applying BlockIODeviceWeight %" PRIu64 " as IODeviceWeight %" PRIu64 " for %s",
 757                                                           w->weight, weight, w->path);
 758
 759                                         cgroup_apply_io_device_weight(u, w->path, weight);
 760                                 }
 761                         }
 762                 }
 763
 764                 /* Apply limits and free ones without config. */
 765                 if (has_io) {
 766                         CGroupIODeviceLimit *l, *next;
 767
 768                         LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
 769                                 if (!cgroup_apply_io_device_limit(u, l->path, l->limits))
 770                                         cgroup_context_free_io_device_limit(c, l);
 771                         }
 772                 } else if (has_blockio) {
 773                         CGroupBlockIODeviceBandwidth *b, *next;
 774
 775                         LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) {
 776                                 uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
 777                                 CGroupIOLimitType type;
 778
 779                                 for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
 780                                         limits[type] = cgroup_io_limit_defaults[type];
 781
 782                                 limits[CGROUP_IO_RBPS_MAX] = b->rbps;
 783                                 limits[CGROUP_IO_WBPS_MAX] = b->wbps;
 784
 785                                 log_cgroup_compat(u, "Applying BlockIO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as IO{Read|Write}BandwidthMax for %s",
 786                                                   b->rbps, b->wbps, b->path);
 787
 788                                 if (!cgroup_apply_io_device_limit(u, b->path, limits))
 789                                         cgroup_context_free_blockio_device_bandwidth(c, b);
 790                         }
 791                 }
 792         }
 793
 794         if (mask & CGROUP_MASK_BLKIO) {
 795                 bool has_io = cgroup_context_has_io_config(c);
 796                 bool has_blockio = cgroup_context_has_blockio_config(c);
 797
 798                 if (!is_root) {
 799                         char buf[DECIMAL_STR_MAX(uint64_t)+1];
 800                         uint64_t weight;
 801
 802                         if (has_io) {
 803                                 uint64_t io_weight = cgroup_context_io_weight(c, state);
 804
 805                                 weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state));
 806
 807                                 log_cgroup_compat(u, "Applying [Startup]IOWeight %" PRIu64 " as [Startup]BlockIOWeight %" PRIu64,
 808                                                   io_weight, weight);
 809                         } else if (has_blockio)
 810                                 weight = cgroup_context_blkio_weight(c, state);
 811                         else
 812                                 weight = CGROUP_BLKIO_WEIGHT_DEFAULT;
 813
 814                         xsprintf(buf, "%" PRIu64 "\n", weight);
 815                         r = cg_set_attribute("blkio", path, "blkio.weight", buf);
 816                         if (r < 0)
 817                                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 818                                               "Failed to set blkio.weight: %m");
 819
 820                         if (has_io) {
 821                                 CGroupIODeviceWeight *w;
 822
 823                                 /* FIXME: no way to reset this list */
 824                                 LIST_FOREACH(device_weights, w, c->io_device_weights) {
 825                                         weight = cgroup_weight_io_to_blkio(w->weight);
 826
 827                                         log_cgroup_compat(u, "Applying IODeviceWeight %" PRIu64 " as BlockIODeviceWeight %" PRIu64 " for %s",
 828                                                           w->weight, weight, w->path);
 829
 830                                         cgroup_apply_blkio_device_weight(u, w->path, weight);
 831                                 }
 832                         } else if (has_blockio) {
 833                                 CGroupBlockIODeviceWeight *w;
 834
 835                                 /* FIXME: no way to reset this list */
 836                                 LIST_FOREACH(device_weights, w, c->blockio_device_weights)
 837                                         cgroup_apply_blkio_device_weight(u, w->path, w->weight);
 838                         }
 839                 }
 840
 841                 /* Apply limits and free ones without config. */
 842                 if (has_io) {
 843                         CGroupIODeviceLimit *l, *next;
 844
 845                         LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) {
 846                                 log_cgroup_compat(u, "Applying IO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as BlockIO{Read|Write}BandwidthMax for %s",
 847                                                   l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX], l->path);
 848
 849                                 if (!cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX]))
 850                                         cgroup_context_free_io_device_limit(c, l);
 851                         }
 852                 } else if (has_blockio) {
 853                         CGroupBlockIODeviceBandwidth *b, *next;
 854
 855                         LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths)
 856                                 if (!cgroup_apply_blkio_device_limit(u, b->path, b->rbps, b->wbps))
 857                                         cgroup_context_free_blockio_device_bandwidth(c, b);
 858                 }
 859         }
 860
 861         if ((mask & CGROUP_MASK_MEMORY) && !is_root) {
 862                 if (cg_all_unified()) {
 863                         uint64_t max;
 864                         uint64_t swap_max = CGROUP_LIMIT_MAX;
 865
 866                         if (cgroup_context_has_unified_memory_config(c)) {
 867                                 max = c->memory_max;
 868                                 swap_max = c->memory_swap_max;
 869                         } else {
 870                                 max = c->memory_limit;
 871
 872                                 if (max != CGROUP_LIMIT_MAX)
 873                                         log_cgroup_compat(u, "Applying MemoryLimit %" PRIu64 " as MemoryMax", max);
 874                         }
 875
 876                         cgroup_apply_unified_memory_limit(u, "memory.low", c->memory_low);
 877                         cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high);
 878                         cgroup_apply_unified_memory_limit(u, "memory.max", max);
 879                         cgroup_apply_unified_memory_limit(u, "memory.swap.max", swap_max);
 880                 } else {
 881                         char buf[DECIMAL_STR_MAX(uint64_t) + 1];
 882                         uint64_t val;
 883
 884                         if (cgroup_context_has_unified_memory_config(c)) {
 885                                 val = c->memory_max;
 886                                 log_cgroup_compat(u, "Applying MemoryMax %" PRIi64 " as MemoryLimit", val);
 887                         } else
 888                                 val = c->memory_limit;
 889
 890                         if (val == CGROUP_LIMIT_MAX)
 891                                 strncpy(buf, "-1\n", sizeof(buf));
 892                         else
 893                                 xsprintf(buf, "%" PRIu64 "\n", val);
 894
 895                         r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf);
 896                         if (r < 0)
 897                                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 898                                               "Failed to set memory.limit_in_bytes: %m");
 899                 }
 900         }
 901
 902         if ((mask & CGROUP_MASK_DEVICES) && !is_root) {
 903                 CGroupDeviceAllow *a;
 904
 905                 /* Changing the devices list of a populated cgroup
 906                  * might result in EINVAL, hence ignore EINVAL
 907                  * here. */
 908
 909                 if (c->device_allow || c->device_policy != CGROUP_AUTO)
 910                         r = cg_set_attribute("devices", path, "devices.deny", "a");
 911                 else
 912                         r = cg_set_attribute("devices", path, "devices.allow", "a");
 913                 if (r < 0)
 914                         log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 915                                       "Failed to reset devices.list: %m");
 916
 917                 if (c->device_policy == CGROUP_CLOSED ||
 918                     (c->device_policy == CGROUP_AUTO && c->device_allow)) {
 919                         static const char auto_devices[] =
 920                                 "/dev/null\0" "rwm\0"
 921                                 "/dev/zero\0" "rwm\0"
 922                                 "/dev/full\0" "rwm\0"
 923                                 "/dev/random\0" "rwm\0"
 924                                 "/dev/urandom\0" "rwm\0"
 925                                 "/dev/tty\0" "rwm\0"
 926                                 "/dev/pts/ptmx\0" "rw\0" /* /dev/pts/ptmx may not be duplicated, but accessed */
 927                                 /* Allow /run/elogind/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
 928                                 /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */
 929                                 "-/run/systemd/inaccessible/chr\0" "rwm\0"
 930                                 "-/run/systemd/inaccessible/blk\0" "rwm\0";
 931
 932                         const char *x, *y;
 933
 934                         NULSTR_FOREACH_PAIR(x, y, auto_devices)
 935                                 whitelist_device(path, x, y);
 936
 937                         whitelist_major(path, "pts", 'c', "rw");
 938                         whitelist_major(path, "kdbus", 'c', "rw");
 939                         whitelist_major(path, "kdbus/*", 'c', "rw");
 940                 }
 941
 942                 LIST_FOREACH(device_allow, a, c->device_allow) {
 943                         char acc[4], *val;
 944                         unsigned k = 0;
 945
 946                         if (a->r)
 947                                 acc[k++] = 'r';
 948                         if (a->w)
 949                                 acc[k++] = 'w';
 950                         if (a->m)
 951                                 acc[k++] = 'm';
 952
 953                         if (k == 0)
 954                                 continue;
 955
 956                         acc[k++] = 0;
 957
 958                         if (startswith(a->path, "/dev/"))
 959                                 whitelist_device(path, a->path, acc);
 960                         else if ((val = startswith(a->path, "block-")))
 961                                 whitelist_major(path, val, 'b', acc);
 962                         else if ((val = startswith(a->path, "char-")))
 963                                 whitelist_major(path, val, 'c', acc);
 964                         else
 965                                 log_unit_debug(u, "Ignoring device %s while writing cgroup attribute.", a->path);
 966                 }
 967         }
 968
 969         if ((mask & CGROUP_MASK_PIDS) && !is_root) {
 970
 971                 if (c->tasks_max != CGROUP_LIMIT_MAX) {
 972                         char buf[DECIMAL_STR_MAX(uint64_t) + 2];
 973
 974                         sprintf(buf, "%" PRIu64 "\n", c->tasks_max);
 975                         r = cg_set_attribute("pids", path, "pids.max", buf);
 976                 } else
 977                         r = cg_set_attribute("pids", path, "pids.max", "max");
 978
 979                 if (r < 0)
 980                         log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
 981                                       "Failed to set pids.max: %m");
 982         }
 983 }
 984
 985 CGroupMask cgroup_context_get_mask(CGroupContext *c) {
 986         CGroupMask mask = 0;
 987
 988         /* Figure out which controllers we need */
 989
 990         if (c->cpu_accounting ||
 991             cgroup_context_has_cpu_weight(c) ||
 992             cgroup_context_has_cpu_shares(c) ||
 993             c->cpu_quota_per_sec_usec != USEC_INFINITY)
 994                 mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU;
 995
 996         if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c))
 997                 mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
 998
 999         if (c->memory_accounting ||
1000             c->memory_limit != CGROUP_LIMIT_MAX ||
1001             cgroup_context_has_unified_memory_config(c))
1002                 mask |= CGROUP_MASK_MEMORY;
1003
1004         if (c->device_allow ||
1005             c->device_policy != CGROUP_AUTO)
1006                 mask |= CGROUP_MASK_DEVICES;
1007
1008         if (c->tasks_accounting ||
1009             c->tasks_max != (uint64_t) -1)
1010                 mask |= CGROUP_MASK_PIDS;
1011
1012         return mask;
1013 }
1014
1015 CGroupMask unit_get_own_mask(Unit *u) {
1016         CGroupContext *c;
1017
1018         /* Returns the mask of controllers the unit needs for itself */
1019
1020         c = unit_get_cgroup_context(u);
1021         if (!c)
1022                 return 0;
1023
1024         /* If delegation is turned on, then turn on all cgroups,
1025          * unless we are on the legacy hierarchy and the process we
1026          * fork into it is known to drop privileges, and hence
1027          * shouldn't get access to the controllers.
1028          *
1029          * Note that on the unified hierarchy it is safe to delegate
1030          * controllers to unprivileged services. */
1031
1032         if (c->delegate) {
1033                 ExecContext *e;
1034
1035                 e = unit_get_exec_context(u);
1036                 if (!e ||
1037                     exec_context_maintains_privileges(e) ||
1038                     cg_all_unified())
1039                         return _CGROUP_MASK_ALL;
1040         }
1041
1042         return cgroup_context_get_mask(c);
1043 }
1044
1045 CGroupMask unit_get_members_mask(Unit *u) {
1046         assert(u);
1047
1048         /* Returns the mask of controllers all of the unit's children
1049          * require, merged */
1050
1051         if (u->cgroup_members_mask_valid)
1052                 return u->cgroup_members_mask;
1053
1054         u->cgroup_members_mask = 0;
1055
1056         if (u->type == UNIT_SLICE) {
1057                 Unit *member;
1058                 Iterator i;
1059
1060                 SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) {
1061
1062                         if (member == u)
1063                                 continue;
1064
1065                         if (UNIT_DEREF(member->slice) != u)
1066                                 continue;
1067
1068                         u->cgroup_members_mask |=
1069                                 unit_get_own_mask(member) |
1070                                 unit_get_members_mask(member);
1071                 }
1072         }
1073
1074         u->cgroup_members_mask_valid = true;
1075         return u->cgroup_members_mask;
1076 }
1077
1078 CGroupMask unit_get_siblings_mask(Unit *u) {
1079         assert(u);
1080
1081         /* Returns the mask of controllers all of the unit's siblings
1082          * require, i.e. the members mask of the unit's parent slice
1083          * if there is one. */
1084
1085         if (UNIT_ISSET(u->slice))
1086                 return unit_get_members_mask(UNIT_DEREF(u->slice));
1087
1088         return unit_get_own_mask(u) | unit_get_members_mask(u);
1089 }
1090
1091 CGroupMask unit_get_subtree_mask(Unit *u) {
1092
1093         /* Returns the mask of this subtree, meaning of the group
1094          * itself and its children. */
1095
1096         return unit_get_own_mask(u) | unit_get_members_mask(u);
1097 }
1098
1099 CGroupMask unit_get_target_mask(Unit *u) {
1100         CGroupMask mask;
1101
1102         /* This returns the cgroup mask of all controllers to enable
1103          * for a specific cgroup, i.e. everything it needs itself,
1104          * plus all that its children need, plus all that its siblings
1105          * need. This is primarily useful on the legacy cgroup
1106          * hierarchy, where we need to duplicate each cgroup in each
1107          * hierarchy that shall be enabled for it. */
1108
1109         mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
1110         mask &= u->manager->cgroup_supported;
1111
1112         return mask;
1113 }
1114
1115 CGroupMask unit_get_enable_mask(Unit *u) {
1116         CGroupMask mask;
1117
1118         /* This returns the cgroup mask of all controllers to enable
1119          * for the children of a specific cgroup. This is primarily
1120          * useful for the unified cgroup hierarchy, where each cgroup
1121          * controls which controllers are enabled for its children. */
1122
1123         mask = unit_get_members_mask(u);
1124         mask &= u->manager->cgroup_supported;
1125
1126         return mask;
1127 }
1128
1129 /* Recurse from a unit up through its containing slices, propagating
1130  * mask bits upward. A unit is also member of itself. */
1131 void unit_update_cgroup_members_masks(Unit *u) {
1132         CGroupMask m;
1133         bool more;
1134
1135         assert(u);
1136
1137         /* Calculate subtree mask */
1138         m = unit_get_subtree_mask(u);
1139
1140         /* See if anything changed from the previous invocation. If
1141          * not, we're done. */
1142         if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask)
1143                 return;
1144
1145         more =
1146                 u->cgroup_subtree_mask_valid &&
1147                 ((m & ~u->cgroup_subtree_mask) != 0) &&
1148                 ((~m & u->cgroup_subtree_mask) == 0);
1149
1150         u->cgroup_subtree_mask = m;
1151         u->cgroup_subtree_mask_valid = true;
1152
1153         if (UNIT_ISSET(u->slice)) {
1154                 Unit *s = UNIT_DEREF(u->slice);
1155
1156                 if (more)
1157                         /* There's more set now than before. We
1158                          * propagate the new mask to the parent's mask
1159                          * (not caring if it actually was valid or
1160                          * not). */
1161
1162                         s->cgroup_members_mask |= m;
1163
1164                 else
1165                         /* There's less set now than before (or we
1166                          * don't know), we need to recalculate
1167                          * everything, so let's invalidate the
1168                          * parent's members mask */
1169
1170                         s->cgroup_members_mask_valid = false;
1171
1172                 /* And now make sure that this change also hits our
1173                  * grandparents */
1174                 unit_update_cgroup_members_masks(s);
1175         }
1176 }
1177
1178 static const char *migrate_callback(CGroupMask mask, void *userdata) {
1179         Unit *u = userdata;
1180
1181         assert(mask != 0);
1182         assert(u);
1183
1184         while (u) {
1185                 if (u->cgroup_path &&
1186                     u->cgroup_realized &&
1187                     (u->cgroup_realized_mask & mask) == mask)
1188                         return u->cgroup_path;
1189
1190                 u = UNIT_DEREF(u->slice);
1191         }
1192
1193         return NULL;
1194 }
1195
1196 char *unit_default_cgroup_path(Unit *u) {
1197         _cleanup_free_ char *escaped = NULL, *slice = NULL;
1198         int r;
1199
1200         assert(u);
1201
1202         if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1203                 return strdup(u->manager->cgroup_root);
1204
1205         if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
1206                 r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
1207                 if (r < 0)
1208                         return NULL;
1209         }
1210
1211         escaped = cg_escape(u->id);
1212         if (!escaped)
1213                 return NULL;
1214
1215         if (slice)
1216                 return strjoin(u->manager->cgroup_root, "/", slice, "/",
1217                                escaped);
1218         else
1219                 return strjoin(u->manager->cgroup_root, "/", escaped);
1220 }
1221
1222 int unit_set_cgroup_path(Unit *u, const char *path) {
1223         _cleanup_free_ char *p = NULL;
1224         int r;
1225
1226         assert(u);
1227
1228         if (path) {
1229                 p = strdup(path);
1230                 if (!p)
1231                         return -ENOMEM;
1232         } else
1233                 p = NULL;
1234
1235         if (streq_ptr(u->cgroup_path, p))
1236                 return 0;
1237
1238         if (p) {
1239                 r = hashmap_put(u->manager->cgroup_unit, p, u);
1240                 if (r < 0)
1241                         return r;
1242         }
1243
1244         unit_release_cgroup(u);
1245
1246         u->cgroup_path = p;
1247         p = NULL;
1248
1249         return 1;
1250 }
1251
1252 int unit_watch_cgroup(Unit *u) {
1253         _cleanup_free_ char *events = NULL;
1254         int r;
1255
1256         assert(u);
1257
1258         if (!u->cgroup_path)
1259                 return 0;
1260
1261         if (u->cgroup_inotify_wd >= 0)
1262                 return 0;
1263
1264         /* Only applies to the unified hierarchy */
1265         if (!cg_unified(SYSTEMD_CGROUP_CONTROLLER))
1266                 return 0;
1267
1268         /* Don't watch the root slice, it's pointless. */
1269         if (unit_has_name(u, SPECIAL_ROOT_SLICE))
1270                 return 0;
1271
1272         r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops);
1273         if (r < 0)
1274                 return log_oom();
1275
1276         r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events);
1277         if (r < 0)
1278                 return log_oom();
1279
1280         u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
1281         if (u->cgroup_inotify_wd < 0) {
1282
1283                 if (errno == ENOENT) /* If the directory is already
1284                                       * gone we don't need to track
1285                                       * it, so this is not an error */
1286                         return 0;
1287
1288                 return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path);
1289         }
1290
1291         r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u);
1292         if (r < 0)
1293                 return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m");
1294
1295         return 0;
1296 }
1297
1298 static int unit_create_cgroup(
1299                 Unit *u,
1300                 CGroupMask target_mask,
1301                 CGroupMask enable_mask) {
1302
1303         CGroupContext *c;
1304         int r;
1305
1306         assert(u);
1307
1308         c = unit_get_cgroup_context(u);
1309         if (!c)
1310                 return 0;
1311
1312         if (!u->cgroup_path) {
1313                 _cleanup_free_ char *path = NULL;
1314
1315                 path = unit_default_cgroup_path(u);
1316                 if (!path)
1317                         return log_oom();
1318
1319                 r = unit_set_cgroup_path(u, path);
1320                 if (r == -EEXIST)
1321                         return log_unit_error_errno(u, r, "Control group %s exists already.", path);
1322                 if (r < 0)
1323                         return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
1324         }
1325
1326         /* First, create our own group */
1327         r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
1328         if (r < 0)
1329                 return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
1330
1331         /* Start watching it */
1332         (void) unit_watch_cgroup(u);
1333
1334         /* Enable all controllers we need */
1335         r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path);
1336         if (r < 0)
1337                 log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
1338
1339         /* Keep track that this is now realized */
1340         u->cgroup_realized = true;
1341         u->cgroup_realized_mask = target_mask;
1342         u->cgroup_enabled_mask = enable_mask;
1343
1344         if (u->type != UNIT_SLICE && !c->delegate) {
1345
1346                 /* Then, possibly move things over, but not if
1347                  * subgroups may contain processes, which is the case
1348                  * for slice and delegation units. */
1349                 r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
1350                 if (r < 0)
1351                         log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
1352         }
1353
1354         return 0;
1355 }
1356
1357 int unit_attach_pids_to_cgroup(Unit *u) {
1358         int r;
1359         assert(u);
1360
1361         r = unit_realize_cgroup(u);
1362         if (r < 0)
1363                 return r;
1364
1365         r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u);
1366         if (r < 0)
1367                 return r;
1368
1369         return 0;
1370 }
1371
1372 static void cgroup_xattr_apply(Unit *u) {
1373         char ids[SD_ID128_STRING_MAX];
1374         int r;
1375
1376         assert(u);
1377
1378         if (!MANAGER_IS_SYSTEM(u->manager))
1379                 return;
1380
1381         if (sd_id128_is_null(u->invocation_id))
1382                 return;
1383
1384         r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
1385                          "trusted.invocation_id",
1386                          sd_id128_to_string(u->invocation_id, ids), 32,
1387                          0);
1388         if (r < 0)
1389                 log_unit_warning_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path);
1390 }
1391
1392 static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask, CGroupMask enable_mask) {
1393         assert(u);
1394
1395         return u->cgroup_realized && u->cgroup_realized_mask == target_mask && u->cgroup_enabled_mask == enable_mask;
1396 }
1397
1398 /* Check if necessary controllers and attributes for a unit are in place.
1399  *
1400  * If so, do nothing.
1401  * If not, create paths, move processes over, and set attributes.
1402  *
1403  * Returns 0 on success and < 0 on failure. */
1404 static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
1405         CGroupMask target_mask, enable_mask;
1406         int r;
1407
1408         assert(u);
1409
1410         if (u->in_cgroup_queue) {
1411                 LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u);
1412                 u->in_cgroup_queue = false;
1413         }
1414
1415         target_mask = unit_get_target_mask(u);
1416         enable_mask = unit_get_enable_mask(u);
1417
1418         if (unit_has_mask_realized(u, target_mask, enable_mask))
1419                 return 0;
1420
1421         /* First, realize parents */
1422         if (UNIT_ISSET(u->slice)) {
1423                 r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state);
1424                 if (r < 0)
1425                         return r;
1426         }
1427
1428         /* And then do the real work */
1429         r = unit_create_cgroup(u, target_mask, enable_mask);
1430         if (r < 0)
1431                 return r;
1432
1433         /* Finally, apply the necessary attributes. */
1434         cgroup_context_apply(u, target_mask, state);
1435         cgroup_xattr_apply(u);
1436
1437         return 0;
1438 }
1439
1440 static void unit_add_to_cgroup_queue(Unit *u) {
1441
1442         if (u->in_cgroup_queue)
1443                 return;
1444
1445         LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u);
1446         u->in_cgroup_queue = true;
1447 }
1448
1449 unsigned manager_dispatch_cgroup_queue(Manager *m) {
1450         ManagerState state;
1451         unsigned n = 0;
1452         Unit *i;
1453         int r;
1454
1455         state = manager_state(m);
1456
1457         while ((i = m->cgroup_queue)) {
1458                 assert(i->in_cgroup_queue);
1459
1460                 r = unit_realize_cgroup_now(i, state);
1461                 if (r < 0)
1462                         log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
1463
1464                 n++;
1465         }
1466
1467         return n;
1468 }
1469
1470 static void unit_queue_siblings(Unit *u) {
1471         Unit *slice;
1472
1473         /* This adds the siblings of the specified unit and the
1474          * siblings of all parent units to the cgroup queue. (But
1475          * neither the specified unit itself nor the parents.) */
1476
1477         while ((slice = UNIT_DEREF(u->slice))) {
1478                 Iterator i;
1479                 Unit *m;
1480
1481                 SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) {
1482                         if (m == u)
1483                                 continue;
1484
1485                         /* Skip units that have a dependency on the slice
1486                          * but aren't actually in it. */
1487                         if (UNIT_DEREF(m->slice) != slice)
1488                                 continue;
1489
1490                         /* No point in doing cgroup application for units
1491                          * without active processes. */
1492                         if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
1493                                 continue;
1494
1495                         /* If the unit doesn't need any new controllers
1496                          * and has current ones realized, it doesn't need
1497                          * any changes. */
1498                         if (unit_has_mask_realized(m, unit_get_target_mask(m), unit_get_enable_mask(m)))
1499                                 continue;
1500
1501                         unit_add_to_cgroup_queue(m);
1502                 }
1503
1504                 u = slice;
1505         }
1506 }
1507
1508 int unit_realize_cgroup(Unit *u) {
1509         assert(u);
1510
1511         if (!UNIT_HAS_CGROUP_CONTEXT(u))
1512                 return 0;
1513
1514         /* So, here's the deal: when realizing the cgroups for this
1515          * unit, we need to first create all parents, but there's more
1516          * actually: for the weight-based controllers we also need to
1517          * make sure that all our siblings (i.e. units that are in the
1518          * same slice as we are) have cgroups, too. Otherwise, things
1519          * would become very uneven as each of their processes would
1520          * get as much resources as all our group together. This call
1521          * will synchronously create the parent cgroups, but will
1522          * defer work on the siblings to the next event loop
1523          * iteration. */
1524
1525         /* Add all sibling slices to the cgroup queue. */
1526         unit_queue_siblings(u);
1527
1528         /* And realize this one now (and apply the values) */
1529         return unit_realize_cgroup_now(u, manager_state(u->manager));
1530 }
1531
1532 void unit_release_cgroup(Unit *u) {
1533         assert(u);
1534
1535         /* Forgets all cgroup details for this cgroup */
1536
1537         if (u->cgroup_path) {
1538                 (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
1539                 u->cgroup_path = mfree(u->cgroup_path);
1540         }
1541
1542         if (u->cgroup_inotify_wd >= 0) {
1543                 if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0)
1544                         log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id);
1545
1546                 (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd));
1547                 u->cgroup_inotify_wd = -1;
1548         }
1549 }
1550
1551 void unit_prune_cgroup(Unit *u) {
1552         int r;
1553         bool is_root_slice;
1554
1555         assert(u);
1556
1557         /* Removes the cgroup, if empty and possible, and stops watching it. */
1558
1559         if (!u->cgroup_path)
1560                 return;
1561
1562         (void) unit_get_cpu_usage(u, NULL); /* Cache the last CPU usage value before we destroy the cgroup */
1563
1564         is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
1565
1566         r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
1567         if (r < 0) {
1568                 log_unit_debug_errno(u, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
1569                 return;
1570         }
1571
1572         if (is_root_slice)
1573                 return;
1574
1575         unit_release_cgroup(u);
1576
1577         u->cgroup_realized = false;
1578         u->cgroup_realized_mask = 0;
1579         u->cgroup_enabled_mask = 0;
1580 }
1581
1582 int unit_search_main_pid(Unit *u, pid_t *ret) {
1583         _cleanup_fclose_ FILE *f = NULL;
1584         pid_t pid = 0, npid, mypid;
1585         int r;
1586
1587         assert(u);
1588         assert(ret);
1589
1590         if (!u->cgroup_path)
1591                 return -ENXIO;
1592
1593         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
1594         if (r < 0)
1595                 return r;
1596
1597         mypid = getpid();
1598         while (cg_read_pid(f, &npid) > 0)  {
1599                 pid_t ppid;
1600
1601                 if (npid == pid)
1602                         continue;
1603
1604                 /* Ignore processes that aren't our kids */
1605                 if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid)
1606                         continue;
1607
1608                 if (pid != 0)
1609                         /* Dang, there's more than one daemonized PID
1610                         in this group, so we don't know what process
1611                         is the main process. */
1612
1613                         return -ENODATA;
1614
1615                 pid = npid;
1616         }
1617
1618         *ret = pid;
1619         return 0;
1620 }
1621
1622 static int unit_watch_pids_in_path(Unit *u, const char *path) {
1623         _cleanup_closedir_ DIR *d = NULL;
1624         _cleanup_fclose_ FILE *f = NULL;
1625         int ret = 0, r;
1626
1627         assert(u);
1628         assert(path);
1629
1630         r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
1631         if (r < 0)
1632                 ret = r;
1633         else {
1634                 pid_t pid;
1635
1636                 while ((r = cg_read_pid(f, &pid)) > 0) {
1637                         r = unit_watch_pid(u, pid);
1638                         if (r < 0 && ret >= 0)
1639                                 ret = r;
1640                 }
1641
1642                 if (r < 0 && ret >= 0)
1643                         ret = r;
1644         }
1645
1646         r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
1647         if (r < 0) {
1648                 if (ret >= 0)
1649                         ret = r;
1650         } else {
1651                 char *fn;
1652
1653                 while ((r = cg_read_subgroup(d, &fn)) > 0) {
1654                         _cleanup_free_ char *p = NULL;
1655
1656                         p = strjoin(path, "/", fn);
1657                         free(fn);
1658
1659                         if (!p)
1660                                 return -ENOMEM;
1661
1662                         r = unit_watch_pids_in_path(u, p);
1663                         if (r < 0 && ret >= 0)
1664                                 ret = r;
1665                 }
1666
1667                 if (r < 0 && ret >= 0)
1668                         ret = r;
1669         }
1670
1671         return ret;
1672 }
1673
1674 int unit_watch_all_pids(Unit *u) {
1675         assert(u);
1676
1677         /* Adds all PIDs from our cgroup to the set of PIDs we
1678          * watch. This is a fallback logic for cases where we do not
1679          * get reliable cgroup empty notifications: we try to use
1680          * SIGCHLD as replacement. */
1681
1682         if (!u->cgroup_path)
1683                 return -ENOENT;
1684
1685         if (cg_unified(SYSTEMD_CGROUP_CONTROLLER)) /* On unified we can use proper notifications */
1686                 return 0;
1687
1688         return unit_watch_pids_in_path(u, u->cgroup_path);
1689 }
1690
1691 int unit_notify_cgroup_empty(Unit *u) {
1692         int r;
1693
1694         assert(u);
1695
1696         if (!u->cgroup_path)
1697                 return 0;
1698
1699         r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
1700         if (r <= 0)
1701                 return r;
1702
1703         unit_add_to_gc_queue(u);
1704
1705         if (UNIT_VTABLE(u)->notify_cgroup_empty)
1706                 UNIT_VTABLE(u)->notify_cgroup_empty(u);
1707
1708         return 0;
1709 }
1710
1711 static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
1712         Manager *m = userdata;
1713
1714         assert(s);
1715         assert(fd >= 0);
1716         assert(m);
1717
1718         for (;;) {
1719                 union inotify_event_buffer buffer;
1720                 struct inotify_event *e;
1721                 ssize_t l;
1722
1723                 l = read(fd, &buffer, sizeof(buffer));
1724                 if (l < 0) {
1725                         if (errno == EINTR || errno == EAGAIN)
1726                                 return 0;
1727
1728                         return log_error_errno(errno, "Failed to read control group inotify events: %m");
1729                 }
1730
1731                 FOREACH_INOTIFY_EVENT(e, buffer, l) {
1732                         Unit *u;
1733
1734                         if (e->wd < 0)
1735                                 /* Queue overflow has no watch descriptor */
1736                                 continue;
1737
1738                         if (e->mask & IN_IGNORED)
1739                                 /* The watch was just removed */
1740                                 continue;
1741
1742                         u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd));
1743                         if (!u) /* Not that inotify might deliver
1744                                  * events for a watch even after it
1745                                  * was removed, because it was queued
1746                                  * before the removal. Let's ignore
1747                                  * this here safely. */
1748                                 continue;
1749
1750                         (void) unit_notify_cgroup_empty(u);
1751                 }
1752         }
1753 }
1754 #endif // 0
1755
1756 int manager_setup_cgroup(Manager *m) {
1757         _cleanup_free_ char *path = NULL;
1758         CGroupController c;
1759         int r;
1760         char *e;
1761
1762         assert(m);
1763
1764         /* 1. Determine hierarchy */
1765         m->cgroup_root = mfree(m->cgroup_root);
1766         r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
1767         if (r < 0)
1768                 return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
1769
1770 #if 0 /// elogind does not support systemd scopes and slices
1771         /* Chop off the init scope, if we are already located in it */
1772         e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1773
1774         /* LEGACY: Also chop off the system slice if we are in
1775          * it. This is to support live upgrades from older systemd
1776          * versions where PID 1 was moved there. Also see
1777          * cg_get_root_path(). */
1778         if (!e && MANAGER_IS_SYSTEM(m)) {
1779                 e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
1780                 if (!e)
1781                         e = endswith(m->cgroup_root, "/system"); /* even more legacy */
1782         }
1783         if (e)
1784                 *e = 0;
1785 #endif // 0
1786
1787         /* And make sure to store away the root value without trailing
1788          * slash, even for the root dir, so that we can easily prepend
1789          * it everywhere. */
1790         while ((e = endswith(m->cgroup_root, "/")))
1791                 *e = 0;
1792         log_debug_elogind("Cgroup Controller \"%s\" -> root \"%s\"",
1793                           SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root);
1794
1795         /* 2. Show data */
1796         r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
1797         if (r < 0)
1798                 return log_error_errno(r, "Cannot find cgroup mount point: %m");
1799
1800         r = cg_unified_flush();
1801         if (r < 0)
1802                 return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
1803
1804         if (cg_all_unified())
1805                 log_debug("Unified cgroup hierarchy is located at %s.", path);
1806         else if (cg_unified(SYSTEMD_CGROUP_CONTROLLER))
1807                 log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path);
1808         else
1809                 log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path);
1810
1811         if (!m->test_run) {
1812                 const char *scope_path;
1813
1814                 /* 3. Install agent */
1815                 if (cg_unified(SYSTEMD_CGROUP_CONTROLLER)) {
1816
1817                         /* In the unified hierarchy we can get
1818                          * cgroup empty notifications via inotify. */
1819
1820 #if 0 /// elogind does not support the unified hierarchy, yet.
1821                         m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
1822                         safe_close(m->cgroup_inotify_fd);
1823
1824                         m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
1825                         if (m->cgroup_inotify_fd < 0)
1826                                 return log_error_errno(errno, "Failed to create control group inotify object: %m");
1827
1828                         r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
1829                         if (r < 0)
1830                                 return log_error_errno(r, "Failed to watch control group inotify object: %m");
1831
1832                         /* Process cgroup empty notifications early, but after service notifications and SIGCHLD. Also
1833                          * see handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
1834                         r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-5);
1835                         if (r < 0)
1836                                 return log_error_errno(r, "Failed to set priority of inotify event source: %m");
1837
1838                         (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
1839
1840 #else
1841                         return log_error_errno(EOPNOTSUPP, "Unified cgroup hierarchy not supported: %m");
1842 #endif // 0
1843                 } else if (MANAGER_IS_SYSTEM(m)) {
1844
1845                         /* On the legacy hierarchy we only get
1846                          * notifications via cgroup agents. (Which
1847                          * isn't really reliable, since it does not
1848                          * generate events when control groups with
1849                          * children run empty. */
1850
1851                         r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
1852                         if (r < 0)
1853                                 log_warning_errno(r, "Failed to install release agent, ignoring: %m");
1854                         else if (r > 0)
1855                                 log_debug("Installed release agent.");
1856                         else if (r == 0)
1857                                 log_debug("Release agent already installed.");
1858                 }
1859
1860 #if 0 /// elogind is not meant to run in systemd init scope
1861                 /* 4. Make sure we are in the special "init.scope" unit in the root slice. */
1862                 scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
1863                 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1864 #else
1865                 if (streq(SYSTEMD_CGROUP_CONTROLLER, "name=elogind"))
1866                         // we are our own cgroup controller
1867                         scope_path = strjoina("");
1868                 else if (streq(m->cgroup_root, "/elogind"))
1869                         // root already is our cgroup
1870                         scope_path = strjoina(m->cgroup_root);
1871                 else
1872                         // we have to create our own group
1873                         scope_path = strjoina(m->cgroup_root, "/elogind");
1874                 r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1875 #endif // 0
1876                 if (r < 0)
1877                         return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
1878                 log_debug_elogind("Created control group \"%s\"", scope_path);
1879
1880                 /* also, move all other userspace processes remaining
1881                  * in the root cgroup into that scope. */
1882                 r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
1883                 if (r < 0)
1884                         log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
1885
1886                 /* 5. And pin it, so that it cannot be unmounted */
1887                 safe_close(m->pin_cgroupfs_fd);
1888                 m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
1889                 if (m->pin_cgroupfs_fd < 0)
1890                         return log_error_errno(errno, "Failed to open pin file: %m");
1891
1892                 /* 6.  Always enable hierarchical support if it exists... */
1893                 if (!cg_all_unified())
1894                         (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
1895         }
1896
1897         /* 7. Figure out which controllers are supported */
1898         r = cg_mask_supported(&m->cgroup_supported);
1899         if (r < 0)
1900                 return log_error_errno(r, "Failed to determine supported controllers: %m");
1901
1902         for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
1903                 log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c)));
1904
1905         return 0;
1906 }
1907
1908 void manager_shutdown_cgroup(Manager *m, bool delete) {
1909         assert(m);
1910
1911         /* We can't really delete the group, since we are in it. But
1912          * let's trim it. */
1913         if (delete && m->cgroup_root)
1914                 (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
1915
1916 #if 0 /// elogind does not support the unified hierarchy, yet.
1917         m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit);
1918
1919         m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
1920         m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
1921 #endif // 0
1922
1923         m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
1924
1925         m->cgroup_root = mfree(m->cgroup_root);
1926 }
1927
1928 #if 0 /// UNNEEDED by elogind
1929 Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
1930         char *p;
1931         Unit *u;
1932
1933         assert(m);
1934         assert(cgroup);
1935
1936         u = hashmap_get(m->cgroup_unit, cgroup);
1937         if (u)
1938                 return u;
1939
1940         p = strdupa(cgroup);
1941         for (;;) {
1942                 char *e;
1943
1944                 e = strrchr(p, '/');
1945                 if (!e || e == p)
1946                         return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
1947
1948                 *e = 0;
1949
1950                 u = hashmap_get(m->cgroup_unit, p);
1951                 if (u)
1952                         return u;
1953         }
1954 }
1955
1956 Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) {
1957         _cleanup_free_ char *cgroup = NULL;
1958         int r;
1959
1960         assert(m);
1961
1962         if (pid <= 0)
1963                 return NULL;
1964
1965         r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup);
1966         if (r < 0)
1967                 return NULL;
1968
1969         return manager_get_unit_by_cgroup(m, cgroup);
1970 }
1971
1972 Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
1973         Unit *u;
1974
1975         assert(m);
1976
1977         if (pid <= 0)
1978                 return NULL;
1979
1980         if (pid == 1)
1981                 return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
1982
1983         u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid));
1984         if (u)
1985                 return u;
1986
1987         u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid));
1988         if (u)
1989                 return u;
1990
1991         return manager_get_unit_by_pid_cgroup(m, pid);
1992 }
1993 #endif // 0
1994
1995 #if 0 /// elogind must substitute this with its own variant
1996 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
1997         Unit *u;
1998
1999         assert(m);
2000         assert(cgroup);
2001
2002         log_debug("Got cgroup empty notification for: %s", cgroup);
2003
2004         u = manager_get_unit_by_cgroup(m, cgroup);
2005         if (!u)
2006                 return 0;
2007
2008         return unit_notify_cgroup_empty(u);
2009 }
2010 #else
2011 int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
2012         Session *s;
2013
2014         assert(m);
2015         assert(cgroup);
2016
2017         log_debug("Got cgroup empty notification for: %s", cgroup);
2018
2019         s = hashmap_get(m->sessions, cgroup);
2020
2021         if (s) {
2022                 session_finalize(s);
2023                 session_free(s);
2024         } else
2025                 log_warning("Session not found: %s", cgroup);
2026
2027         return 0;
2028 }
2029 #endif // 0
2030 #if 0 /// UNNEEDED by elogind
2031 int unit_get_memory_current(Unit *u, uint64_t *ret) {
2032         _cleanup_free_ char *v = NULL;
2033         int r;
2034
2035         assert(u);
2036         assert(ret);
2037
2038         if (!u->cgroup_path)
2039                 return -ENODATA;
2040
2041         if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
2042                 return -ENODATA;
2043
2044         if (!cg_all_unified())
2045                 r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v);
2046         else
2047                 r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v);
2048         if (r == -ENOENT)
2049                 return -ENODATA;
2050         if (r < 0)
2051                 return r;
2052
2053         return safe_atou64(v, ret);
2054 }
2055
2056 int unit_get_tasks_current(Unit *u, uint64_t *ret) {
2057         _cleanup_free_ char *v = NULL;
2058         int r;
2059
2060         assert(u);
2061         assert(ret);
2062
2063         if (!u->cgroup_path)
2064                 return -ENODATA;
2065
2066         if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0)
2067                 return -ENODATA;
2068
2069         r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v);
2070         if (r == -ENOENT)
2071                 return -ENODATA;
2072         if (r < 0)
2073                 return r;
2074
2075         return safe_atou64(v, ret);
2076 }
2077
2078 static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
2079         _cleanup_free_ char *v = NULL;
2080         uint64_t ns;
2081         int r;
2082
2083         assert(u);
2084         assert(ret);
2085
2086         if (!u->cgroup_path)
2087                 return -ENODATA;
2088
2089         if (cg_all_unified()) {
2090                 const char *keys[] = { "usage_usec", NULL };
2091                 _cleanup_free_ char *val = NULL;
2092                 uint64_t us;
2093
2094                 if ((u->cgroup_realized_mask & CGROUP_MASK_CPU) == 0)
2095                         return -ENODATA;
2096
2097                 r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", keys, &val);
2098                 if (r < 0)
2099                         return r;
2100
2101                 r = safe_atou64(val, &us);
2102                 if (r < 0)
2103                         return r;
2104
2105                 ns = us * NSEC_PER_USEC;
2106         } else {
2107                 if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0)
2108                         return -ENODATA;
2109
2110                 r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v);
2111                 if (r == -ENOENT)
2112                         return -ENODATA;
2113                 if (r < 0)
2114                         return r;
2115
2116                 r = safe_atou64(v, &ns);
2117                 if (r < 0)
2118                         return r;
2119         }
2120
2121         *ret = ns;
2122         return 0;
2123 }
2124
2125 int unit_get_cpu_usage(Unit *u, nsec_t *ret) {
2126         nsec_t ns;
2127         int r;
2128
2129         assert(u);
2130
2131         /* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was
2132          * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply
2133          * call this function with a NULL return value. */
2134
2135         r = unit_get_cpu_usage_raw(u, &ns);
2136         if (r == -ENODATA && u->cpu_usage_last != NSEC_INFINITY) {
2137                 /* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our
2138                  * cached value. */
2139
2140                 if (ret)
2141                         *ret = u->cpu_usage_last;
2142                 return 0;
2143         }
2144         if (r < 0)
2145                 return r;
2146
2147         if (ns > u->cpu_usage_base)
2148                 ns -= u->cpu_usage_base;
2149         else
2150                 ns = 0;
2151
2152         u->cpu_usage_last = ns;
2153         if (ret)
2154                 *ret = ns;
2155
2156         return 0;
2157 }
2158
2159 int unit_reset_cpu_usage(Unit *u) {
2160         nsec_t ns;
2161         int r;
2162
2163         assert(u);
2164
2165         u->cpu_usage_last = NSEC_INFINITY;
2166
2167         r = unit_get_cpu_usage_raw(u, &ns);
2168         if (r < 0) {
2169                 u->cpu_usage_base = 0;
2170                 return r;
2171         }
2172
2173         u->cpu_usage_base = ns;
2174         return 0;
2175 }
2176
2177 bool unit_cgroup_delegate(Unit *u) {
2178         CGroupContext *c;
2179
2180         assert(u);
2181
2182         c = unit_get_cgroup_context(u);
2183         if (!c)
2184                 return false;
2185
2186         return c->delegate;
2187 }
2188
2189 void unit_invalidate_cgroup(Unit *u, CGroupMask m) {
2190         assert(u);
2191
2192         if (!UNIT_HAS_CGROUP_CONTEXT(u))
2193                 return;
2194
2195         if (m == 0)
2196                 return;
2197
2198         /* always invalidate compat pairs together */
2199         if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO))
2200                 m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
2201
2202         if ((u->cgroup_realized_mask & m) == 0)
2203                 return;
2204
2205         u->cgroup_realized_mask &= ~m;
2206         unit_add_to_cgroup_queue(u);
2207 }
2208
2209 void manager_invalidate_startup_units(Manager *m) {
2210         Iterator i;
2211         Unit *u;
2212
2213         assert(m);
2214
2215         SET_FOREACH(u, m->startup_units, i)
2216                 unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO);
2217 }
2218
2219 static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = {
2220         [CGROUP_AUTO] = "auto",
2221         [CGROUP_CLOSED] = "closed",
2222         [CGROUP_STRICT] = "strict",
2223 };
2224
2225 DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy);
2226 #endif // 0