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