diff options
Diffstat (limited to 'src/core/cgroup.c')
| -rw-r--r-- | src/core/cgroup.c | 2170 |
1 files changed, 0 insertions, 2170 deletions
diff --git a/src/core/cgroup.c b/src/core/cgroup.c deleted file mode 100644 index 23a92f9651..0000000000 --- a/src/core/cgroup.c +++ /dev/null @@ -1,2170 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2013 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <fcntl.h> -#include <fnmatch.h> - -#include "alloc-util.h" -#include "cgroup-util.h" -#include "cgroup.h" -#include "fd-util.h" -#include "fileio.h" -#include "fs-util.h" -#include "parse-util.h" -#include "path-util.h" -#include "process-util.h" -#include "special.h" -#include "string-table.h" -#include "string-util.h" -#include "stdio-util.h" - -#define CGROUP_CPU_QUOTA_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC) - -static void cgroup_compat_warn(void) { - static bool cgroup_compat_warned = false; - - if (cgroup_compat_warned) - return; - - log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. See cgroup-compat debug messages for details."); - cgroup_compat_warned = true; -} - -#define log_cgroup_compat(unit, fmt, ...) do { \ - cgroup_compat_warn(); \ - log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \ - } while (false) - -void cgroup_context_init(CGroupContext *c) { - assert(c); - - /* Initialize everything to the kernel defaults, assuming the - * structure is preinitialized to 0 */ - - c->cpu_weight = CGROUP_WEIGHT_INVALID; - c->startup_cpu_weight = CGROUP_WEIGHT_INVALID; - c->cpu_quota_per_sec_usec = USEC_INFINITY; - - c->cpu_shares = CGROUP_CPU_SHARES_INVALID; - c->startup_cpu_shares = CGROUP_CPU_SHARES_INVALID; - - c->memory_high = CGROUP_LIMIT_MAX; - c->memory_max = CGROUP_LIMIT_MAX; - c->memory_swap_max = CGROUP_LIMIT_MAX; - - c->memory_limit = CGROUP_LIMIT_MAX; - - c->io_weight = CGROUP_WEIGHT_INVALID; - c->startup_io_weight = CGROUP_WEIGHT_INVALID; - - c->blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID; - c->startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID; - - c->tasks_max = (uint64_t) -1; -} - -void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) { - assert(c); - assert(a); - - LIST_REMOVE(device_allow, c->device_allow, a); - free(a->path); - free(a); -} - -void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) { - assert(c); - assert(w); - - LIST_REMOVE(device_weights, c->io_device_weights, w); - free(w->path); - free(w); -} - -void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) { - assert(c); - assert(l); - - LIST_REMOVE(device_limits, c->io_device_limits, l); - free(l->path); - free(l); -} - -void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) { - assert(c); - assert(w); - - LIST_REMOVE(device_weights, c->blockio_device_weights, w); - free(w->path); - free(w); -} - -void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) { - assert(c); - assert(b); - - LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b); - free(b->path); - free(b); -} - -void cgroup_context_done(CGroupContext *c) { - assert(c); - - while (c->io_device_weights) - cgroup_context_free_io_device_weight(c, c->io_device_weights); - - while (c->io_device_limits) - cgroup_context_free_io_device_limit(c, c->io_device_limits); - - while (c->blockio_device_weights) - cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights); - - while (c->blockio_device_bandwidths) - cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths); - - while (c->device_allow) - cgroup_context_free_device_allow(c, c->device_allow); -} - -void cgroup_context_dump(CGroupContext *c, FILE* f, const char *prefix) { - CGroupIODeviceLimit *il; - CGroupIODeviceWeight *iw; - CGroupBlockIODeviceBandwidth *b; - CGroupBlockIODeviceWeight *w; - CGroupDeviceAllow *a; - char u[FORMAT_TIMESPAN_MAX]; - - assert(c); - assert(f); - - prefix = strempty(prefix); - - fprintf(f, - "%sCPUAccounting=%s\n" - "%sIOAccounting=%s\n" - "%sBlockIOAccounting=%s\n" - "%sMemoryAccounting=%s\n" - "%sTasksAccounting=%s\n" - "%sCPUWeight=%" PRIu64 "\n" - "%sStartupCPUWeight=%" PRIu64 "\n" - "%sCPUShares=%" PRIu64 "\n" - "%sStartupCPUShares=%" PRIu64 "\n" - "%sCPUQuotaPerSecSec=%s\n" - "%sIOWeight=%" PRIu64 "\n" - "%sStartupIOWeight=%" PRIu64 "\n" - "%sBlockIOWeight=%" PRIu64 "\n" - "%sStartupBlockIOWeight=%" PRIu64 "\n" - "%sMemoryLow=%" PRIu64 "\n" - "%sMemoryHigh=%" PRIu64 "\n" - "%sMemoryMax=%" PRIu64 "\n" - "%sMemorySwapMax=%" PRIu64 "\n" - "%sMemoryLimit=%" PRIu64 "\n" - "%sTasksMax=%" PRIu64 "\n" - "%sDevicePolicy=%s\n" - "%sDelegate=%s\n", - prefix, yes_no(c->cpu_accounting), - prefix, yes_no(c->io_accounting), - prefix, yes_no(c->blockio_accounting), - prefix, yes_no(c->memory_accounting), - prefix, yes_no(c->tasks_accounting), - prefix, c->cpu_weight, - prefix, c->startup_cpu_weight, - prefix, c->cpu_shares, - prefix, c->startup_cpu_shares, - prefix, format_timespan(u, sizeof(u), c->cpu_quota_per_sec_usec, 1), - prefix, c->io_weight, - prefix, c->startup_io_weight, - prefix, c->blockio_weight, - prefix, c->startup_blockio_weight, - prefix, c->memory_low, - prefix, c->memory_high, - prefix, c->memory_max, - prefix, c->memory_swap_max, - prefix, c->memory_limit, - prefix, c->tasks_max, - prefix, cgroup_device_policy_to_string(c->device_policy), - prefix, yes_no(c->delegate)); - - LIST_FOREACH(device_allow, a, c->device_allow) - fprintf(f, - "%sDeviceAllow=%s %s%s%s\n", - prefix, - a->path, - a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : ""); - - LIST_FOREACH(device_weights, iw, c->io_device_weights) - fprintf(f, - "%sIODeviceWeight=%s %" PRIu64, - prefix, - iw->path, - iw->weight); - - LIST_FOREACH(device_limits, il, c->io_device_limits) { - char buf[FORMAT_BYTES_MAX]; - CGroupIOLimitType type; - - for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) - if (il->limits[type] != cgroup_io_limit_defaults[type]) - fprintf(f, - "%s%s=%s %s\n", - prefix, - cgroup_io_limit_type_to_string(type), - il->path, - format_bytes(buf, sizeof(buf), il->limits[type])); - } - - LIST_FOREACH(device_weights, w, c->blockio_device_weights) - fprintf(f, - "%sBlockIODeviceWeight=%s %" PRIu64, - prefix, - w->path, - w->weight); - - LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { - char buf[FORMAT_BYTES_MAX]; - - if (b->rbps != CGROUP_LIMIT_MAX) - fprintf(f, - "%sBlockIOReadBandwidth=%s %s\n", - prefix, - b->path, - format_bytes(buf, sizeof(buf), b->rbps)); - if (b->wbps != CGROUP_LIMIT_MAX) - fprintf(f, - "%sBlockIOWriteBandwidth=%s %s\n", - prefix, - b->path, - format_bytes(buf, sizeof(buf), b->wbps)); - } -} - -static int lookup_block_device(const char *p, dev_t *dev) { - struct stat st; - int r; - - assert(p); - assert(dev); - - r = stat(p, &st); - if (r < 0) - return log_warning_errno(errno, "Couldn't stat device %s: %m", p); - - if (S_ISBLK(st.st_mode)) - *dev = st.st_rdev; - else if (major(st.st_dev) != 0) { - /* If this is not a device node then find the block - * device this file is stored on */ - *dev = st.st_dev; - - /* If this is a partition, try to get the originating - * block device */ - block_get_whole_disk(*dev, dev); - } else { - log_warning("%s is not a block device and file system block device cannot be determined or is not local.", p); - return -ENODEV; - } - - return 0; -} - -static int whitelist_device(const char *path, const char *node, const char *acc) { - char buf[2+DECIMAL_STR_MAX(dev_t)*2+2+4]; - struct stat st; - int r; - - assert(path); - assert(acc); - - if (stat(node, &st) < 0) { - log_warning("Couldn't stat device %s", node); - return -errno; - } - - if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) { - log_warning("%s is not a device.", node); - return -ENODEV; - } - - sprintf(buf, - "%c %u:%u %s", - S_ISCHR(st.st_mode) ? 'c' : 'b', - major(st.st_rdev), minor(st.st_rdev), - acc); - - r = cg_set_attribute("devices", path, "devices.allow", buf); - if (r < 0) - log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set devices.allow on %s: %m", path); - - return r; -} - -static int whitelist_major(const char *path, const char *name, char type, const char *acc) { - _cleanup_fclose_ FILE *f = NULL; - char line[LINE_MAX]; - bool good = false; - int r; - - assert(path); - assert(acc); - assert(type == 'b' || type == 'c'); - - f = fopen("/proc/devices", "re"); - if (!f) - return log_warning_errno(errno, "Cannot open /proc/devices to resolve %s (%c): %m", name, type); - - FOREACH_LINE(line, f, goto fail) { - char buf[2+DECIMAL_STR_MAX(unsigned)+3+4], *p, *w; - unsigned maj; - - truncate_nl(line); - - if (type == 'c' && streq(line, "Character devices:")) { - good = true; - continue; - } - - if (type == 'b' && streq(line, "Block devices:")) { - good = true; - continue; - } - - if (isempty(line)) { - good = false; - continue; - } - - if (!good) - continue; - - p = strstrip(line); - - w = strpbrk(p, WHITESPACE); - if (!w) - continue; - *w = 0; - - r = safe_atou(p, &maj); - if (r < 0) - continue; - if (maj <= 0) - continue; - - w++; - w += strspn(w, WHITESPACE); - - if (fnmatch(name, w, 0) != 0) - continue; - - sprintf(buf, - "%c %u:* %s", - type, - maj, - acc); - - r = cg_set_attribute("devices", path, "devices.allow", buf); - if (r < 0) - log_full_errno(IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set devices.allow on %s: %m", path); - } - - return 0; - -fail: - log_warning_errno(errno, "Failed to read /proc/devices: %m"); - return -errno; -} - -static bool cgroup_context_has_cpu_weight(CGroupContext *c) { - return c->cpu_weight != CGROUP_WEIGHT_INVALID || - c->startup_cpu_weight != CGROUP_WEIGHT_INVALID; -} - -static bool cgroup_context_has_cpu_shares(CGroupContext *c) { - return c->cpu_shares != CGROUP_CPU_SHARES_INVALID || - c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID; -} - -static uint64_t cgroup_context_cpu_weight(CGroupContext *c, ManagerState state) { - if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && - c->startup_cpu_weight != CGROUP_WEIGHT_INVALID) - return c->startup_cpu_weight; - else if (c->cpu_weight != CGROUP_WEIGHT_INVALID) - return c->cpu_weight; - else - return CGROUP_WEIGHT_DEFAULT; -} - -static uint64_t cgroup_context_cpu_shares(CGroupContext *c, ManagerState state) { - if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && - c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID) - return c->startup_cpu_shares; - else if (c->cpu_shares != CGROUP_CPU_SHARES_INVALID) - return c->cpu_shares; - else - return CGROUP_CPU_SHARES_DEFAULT; -} - -static void cgroup_apply_unified_cpu_config(Unit *u, uint64_t weight, uint64_t quota) { - char buf[MAX(DECIMAL_STR_MAX(uint64_t) + 1, (DECIMAL_STR_MAX(usec_t) + 1) * 2)]; - int r; - - xsprintf(buf, "%" PRIu64 "\n", weight); - r = cg_set_attribute("cpu", u->cgroup_path, "cpu.weight", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set cpu.weight: %m"); - - if (quota != USEC_INFINITY) - xsprintf(buf, USEC_FMT " " USEC_FMT "\n", - quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC, CGROUP_CPU_QUOTA_PERIOD_USEC); - else - xsprintf(buf, "max " USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC); - - r = cg_set_attribute("cpu", u->cgroup_path, "cpu.max", buf); - - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set cpu.max: %m"); -} - -static void cgroup_apply_legacy_cpu_config(Unit *u, uint64_t shares, uint64_t quota) { - char buf[MAX(DECIMAL_STR_MAX(uint64_t), DECIMAL_STR_MAX(usec_t)) + 1]; - int r; - - xsprintf(buf, "%" PRIu64 "\n", shares); - r = cg_set_attribute("cpu", u->cgroup_path, "cpu.shares", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set cpu.shares: %m"); - - xsprintf(buf, USEC_FMT "\n", CGROUP_CPU_QUOTA_PERIOD_USEC); - r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_period_us", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set cpu.cfs_period_us: %m"); - - if (quota != USEC_INFINITY) { - xsprintf(buf, USEC_FMT "\n", quota * CGROUP_CPU_QUOTA_PERIOD_USEC / USEC_PER_SEC); - r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", buf); - } else - r = cg_set_attribute("cpu", u->cgroup_path, "cpu.cfs_quota_us", "-1"); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set cpu.cfs_quota_us: %m"); -} - -static uint64_t cgroup_cpu_shares_to_weight(uint64_t shares) { - return CLAMP(shares * CGROUP_WEIGHT_DEFAULT / CGROUP_CPU_SHARES_DEFAULT, - CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX); -} - -static uint64_t cgroup_cpu_weight_to_shares(uint64_t weight) { - return CLAMP(weight * CGROUP_CPU_SHARES_DEFAULT / CGROUP_WEIGHT_DEFAULT, - CGROUP_CPU_SHARES_MIN, CGROUP_CPU_SHARES_MAX); -} - -static bool cgroup_context_has_io_config(CGroupContext *c) { - return c->io_accounting || - c->io_weight != CGROUP_WEIGHT_INVALID || - c->startup_io_weight != CGROUP_WEIGHT_INVALID || - c->io_device_weights || - c->io_device_limits; -} - -static bool cgroup_context_has_blockio_config(CGroupContext *c) { - return c->blockio_accounting || - c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID || - c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID || - c->blockio_device_weights || - c->blockio_device_bandwidths; -} - -static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) { - if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && - c->startup_io_weight != CGROUP_WEIGHT_INVALID) - return c->startup_io_weight; - else if (c->io_weight != CGROUP_WEIGHT_INVALID) - return c->io_weight; - else - return CGROUP_WEIGHT_DEFAULT; -} - -static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) { - if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) && - c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID) - return c->startup_blockio_weight; - else if (c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID) - return c->blockio_weight; - else - return CGROUP_BLKIO_WEIGHT_DEFAULT; -} - -static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) { - return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT, - CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX); -} - -static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) { - return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT, - CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX); -} - -static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) { - char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1]; - dev_t dev; - int r; - - r = lookup_block_device(dev_path, &dev); - if (r < 0) - return; - - xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight); - r = cg_set_attribute("io", u->cgroup_path, "io.weight", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set io.weight: %m"); -} - -static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) { - char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1]; - dev_t dev; - int r; - - r = lookup_block_device(dev_path, &dev); - if (r < 0) - return; - - xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight); - r = cg_set_attribute("blkio", u->cgroup_path, "blkio.weight_device", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set blkio.weight_device: %m"); -} - -static unsigned cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) { - char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)]; - char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4]; - CGroupIOLimitType type; - dev_t dev; - unsigned n = 0; - int r; - - r = lookup_block_device(dev_path, &dev); - if (r < 0) - return 0; - - for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) { - if (limits[type] != cgroup_io_limit_defaults[type]) { - xsprintf(limit_bufs[type], "%" PRIu64, limits[type]); - n++; - } else { - xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0"); - } - } - - xsprintf(buf, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev), minor(dev), - limit_bufs[CGROUP_IO_RBPS_MAX], limit_bufs[CGROUP_IO_WBPS_MAX], - limit_bufs[CGROUP_IO_RIOPS_MAX], limit_bufs[CGROUP_IO_WIOPS_MAX]); - r = cg_set_attribute("io", u->cgroup_path, "io.max", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set io.max: %m"); - return n; -} - -static unsigned cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) { - char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1]; - dev_t dev; - unsigned n = 0; - int r; - - r = lookup_block_device(dev_path, &dev); - if (r < 0) - return 0; - - if (rbps != CGROUP_LIMIT_MAX) - n++; - sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps); - r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.read_bps_device", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set blkio.throttle.read_bps_device: %m"); - - if (wbps != CGROUP_LIMIT_MAX) - n++; - sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps); - r = cg_set_attribute("blkio", u->cgroup_path, "blkio.throttle.write_bps_device", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set blkio.throttle.write_bps_device: %m"); - - return n; -} - -static bool cgroup_context_has_unified_memory_config(CGroupContext *c) { - return c->memory_low > 0 || c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX || c->memory_swap_max != CGROUP_LIMIT_MAX; -} - -static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) { - char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max"; - int r; - - if (v != CGROUP_LIMIT_MAX) - xsprintf(buf, "%" PRIu64 "\n", v); - - r = cg_set_attribute("memory", u->cgroup_path, file, buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set %s: %m", file); -} - -static void cgroup_context_apply(Unit *u, CGroupMask mask, ManagerState state) { - const char *path; - CGroupContext *c; - bool is_root; - int r; - - assert(u); - - c = unit_get_cgroup_context(u); - path = u->cgroup_path; - - assert(c); - assert(path); - - if (mask == 0) - return; - - /* Some cgroup attributes are not supported on the root cgroup, - * hence silently ignore */ - is_root = isempty(path) || path_equal(path, "/"); - if (is_root) - /* Make sure we don't try to display messages with an empty path. */ - path = "/"; - - /* We generally ignore errors caused by read-only mounted - * cgroup trees (assuming we are running in a container then), - * and missing cgroups, i.e. EROFS and ENOENT. */ - - if ((mask & CGROUP_MASK_CPU) && !is_root) { - bool has_weight = cgroup_context_has_cpu_weight(c); - bool has_shares = cgroup_context_has_cpu_shares(c); - - if (cg_all_unified() > 0) { - uint64_t weight; - - if (has_weight) - weight = cgroup_context_cpu_weight(c, state); - else if (has_shares) { - uint64_t shares = cgroup_context_cpu_shares(c, state); - - weight = cgroup_cpu_shares_to_weight(shares); - - log_cgroup_compat(u, "Applying [Startup]CpuShares %" PRIu64 " as [Startup]CpuWeight %" PRIu64 " on %s", - shares, weight, path); - } else - weight = CGROUP_WEIGHT_DEFAULT; - - cgroup_apply_unified_cpu_config(u, weight, c->cpu_quota_per_sec_usec); - } else { - uint64_t shares; - - if (has_weight) { - uint64_t weight = cgroup_context_cpu_weight(c, state); - - shares = cgroup_cpu_weight_to_shares(weight); - - log_cgroup_compat(u, "Applying [Startup]CpuWeight %" PRIu64 " as [Startup]CpuShares %" PRIu64 " on %s", - weight, shares, path); - } else if (has_shares) - shares = cgroup_context_cpu_shares(c, state); - else - shares = CGROUP_CPU_SHARES_DEFAULT; - - cgroup_apply_legacy_cpu_config(u, shares, c->cpu_quota_per_sec_usec); - } - } - - if (mask & CGROUP_MASK_IO) { - bool has_io = cgroup_context_has_io_config(c); - bool has_blockio = cgroup_context_has_blockio_config(c); - - if (!is_root) { - char buf[8+DECIMAL_STR_MAX(uint64_t)+1]; - uint64_t weight; - - if (has_io) - weight = cgroup_context_io_weight(c, state); - else if (has_blockio) { - uint64_t blkio_weight = cgroup_context_blkio_weight(c, state); - - weight = cgroup_weight_blkio_to_io(blkio_weight); - - log_cgroup_compat(u, "Applying [Startup]BlockIOWeight %" PRIu64 " as [Startup]IOWeight %" PRIu64, - blkio_weight, weight); - } else - weight = CGROUP_WEIGHT_DEFAULT; - - xsprintf(buf, "default %" PRIu64 "\n", weight); - r = cg_set_attribute("io", path, "io.weight", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set io.weight: %m"); - - if (has_io) { - CGroupIODeviceWeight *w; - - /* FIXME: no way to reset this list */ - LIST_FOREACH(device_weights, w, c->io_device_weights) - cgroup_apply_io_device_weight(u, w->path, w->weight); - } else if (has_blockio) { - CGroupBlockIODeviceWeight *w; - - /* FIXME: no way to reset this list */ - LIST_FOREACH(device_weights, w, c->blockio_device_weights) { - weight = cgroup_weight_blkio_to_io(w->weight); - - log_cgroup_compat(u, "Applying BlockIODeviceWeight %" PRIu64 " as IODeviceWeight %" PRIu64 " for %s", - w->weight, weight, w->path); - - cgroup_apply_io_device_weight(u, w->path, weight); - } - } - } - - /* Apply limits and free ones without config. */ - if (has_io) { - CGroupIODeviceLimit *l, *next; - - LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) { - if (!cgroup_apply_io_device_limit(u, l->path, l->limits)) - cgroup_context_free_io_device_limit(c, l); - } - } else if (has_blockio) { - CGroupBlockIODeviceBandwidth *b, *next; - - LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) { - uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX]; - CGroupIOLimitType type; - - for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++) - limits[type] = cgroup_io_limit_defaults[type]; - - limits[CGROUP_IO_RBPS_MAX] = b->rbps; - limits[CGROUP_IO_WBPS_MAX] = b->wbps; - - log_cgroup_compat(u, "Applying BlockIO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as IO{Read|Write}BandwidthMax for %s", - b->rbps, b->wbps, b->path); - - if (!cgroup_apply_io_device_limit(u, b->path, limits)) - cgroup_context_free_blockio_device_bandwidth(c, b); - } - } - } - - if (mask & CGROUP_MASK_BLKIO) { - bool has_io = cgroup_context_has_io_config(c); - bool has_blockio = cgroup_context_has_blockio_config(c); - - if (!is_root) { - char buf[DECIMAL_STR_MAX(uint64_t)+1]; - uint64_t weight; - - if (has_io) { - uint64_t io_weight = cgroup_context_io_weight(c, state); - - weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state)); - - log_cgroup_compat(u, "Applying [Startup]IOWeight %" PRIu64 " as [Startup]BlockIOWeight %" PRIu64, - io_weight, weight); - } else if (has_blockio) - weight = cgroup_context_blkio_weight(c, state); - else - weight = CGROUP_BLKIO_WEIGHT_DEFAULT; - - xsprintf(buf, "%" PRIu64 "\n", weight); - r = cg_set_attribute("blkio", path, "blkio.weight", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set blkio.weight: %m"); - - if (has_io) { - CGroupIODeviceWeight *w; - - /* FIXME: no way to reset this list */ - LIST_FOREACH(device_weights, w, c->io_device_weights) { - weight = cgroup_weight_io_to_blkio(w->weight); - - log_cgroup_compat(u, "Applying IODeviceWeight %" PRIu64 " as BlockIODeviceWeight %" PRIu64 " for %s", - w->weight, weight, w->path); - - cgroup_apply_blkio_device_weight(u, w->path, weight); - } - } else if (has_blockio) { - CGroupBlockIODeviceWeight *w; - - /* FIXME: no way to reset this list */ - LIST_FOREACH(device_weights, w, c->blockio_device_weights) - cgroup_apply_blkio_device_weight(u, w->path, w->weight); - } - } - - /* Apply limits and free ones without config. */ - if (has_io) { - CGroupIODeviceLimit *l, *next; - - LIST_FOREACH_SAFE(device_limits, l, next, c->io_device_limits) { - log_cgroup_compat(u, "Applying IO{Read|Write}Bandwidth %" PRIu64 " %" PRIu64 " as BlockIO{Read|Write}BandwidthMax for %s", - l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX], l->path); - - if (!cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX])) - cgroup_context_free_io_device_limit(c, l); - } - } else if (has_blockio) { - CGroupBlockIODeviceBandwidth *b, *next; - - LIST_FOREACH_SAFE(device_bandwidths, b, next, c->blockio_device_bandwidths) - if (!cgroup_apply_blkio_device_limit(u, b->path, b->rbps, b->wbps)) - cgroup_context_free_blockio_device_bandwidth(c, b); - } - } - - if ((mask & CGROUP_MASK_MEMORY) && !is_root) { - if (cg_all_unified() > 0) { - uint64_t max; - uint64_t swap_max = CGROUP_LIMIT_MAX; - - if (cgroup_context_has_unified_memory_config(c)) { - max = c->memory_max; - swap_max = c->memory_swap_max; - } else { - max = c->memory_limit; - - if (max != CGROUP_LIMIT_MAX) - log_cgroup_compat(u, "Applying MemoryLimit %" PRIu64 " as MemoryMax", max); - } - - cgroup_apply_unified_memory_limit(u, "memory.low", c->memory_low); - cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high); - cgroup_apply_unified_memory_limit(u, "memory.max", max); - cgroup_apply_unified_memory_limit(u, "memory.swap.max", swap_max); - } else { - char buf[DECIMAL_STR_MAX(uint64_t) + 1]; - uint64_t val; - - if (cgroup_context_has_unified_memory_config(c)) { - val = c->memory_max; - log_cgroup_compat(u, "Applying MemoryMax %" PRIi64 " as MemoryLimit", val); - } else - val = c->memory_limit; - - if (val == CGROUP_LIMIT_MAX) - strncpy(buf, "-1\n", sizeof(buf)); - else - xsprintf(buf, "%" PRIu64 "\n", val); - - r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set memory.limit_in_bytes: %m"); - } - } - - if ((mask & CGROUP_MASK_DEVICES) && !is_root) { - CGroupDeviceAllow *a; - - /* Changing the devices list of a populated cgroup - * might result in EINVAL, hence ignore EINVAL - * here. */ - - if (c->device_allow || c->device_policy != CGROUP_AUTO) - r = cg_set_attribute("devices", path, "devices.deny", "a"); - else - r = cg_set_attribute("devices", path, "devices.allow", "a"); - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to reset devices.list: %m"); - - if (c->device_policy == CGROUP_CLOSED || - (c->device_policy == CGROUP_AUTO && c->device_allow)) { - static const char auto_devices[] = - "/dev/null\0" "rwm\0" - "/dev/zero\0" "rwm\0" - "/dev/full\0" "rwm\0" - "/dev/random\0" "rwm\0" - "/dev/urandom\0" "rwm\0" - "/dev/tty\0" "rwm\0" - "/dev/pts/ptmx\0" "rw\0" /* /dev/pts/ptmx may not be duplicated, but accessed */ - /* Allow /run/systemd/inaccessible/{chr,blk} devices for mapping InaccessiblePaths */ - "/run/systemd/inaccessible/chr\0" "rwm\0" - "/run/systemd/inaccessible/blk\0" "rwm\0"; - - const char *x, *y; - - NULSTR_FOREACH_PAIR(x, y, auto_devices) - whitelist_device(path, x, y); - - whitelist_major(path, "pts", 'c', "rw"); - whitelist_major(path, "kdbus", 'c', "rw"); - whitelist_major(path, "kdbus/*", 'c', "rw"); - } - - LIST_FOREACH(device_allow, a, c->device_allow) { - char acc[4]; - unsigned k = 0; - - if (a->r) - acc[k++] = 'r'; - if (a->w) - acc[k++] = 'w'; - if (a->m) - acc[k++] = 'm'; - - if (k == 0) - continue; - - acc[k++] = 0; - - if (startswith(a->path, "/dev/")) - whitelist_device(path, a->path, acc); - else if (startswith(a->path, "block-")) - whitelist_major(path, a->path + 6, 'b', acc); - else if (startswith(a->path, "char-")) - whitelist_major(path, a->path + 5, 'c', acc); - else - log_unit_debug(u, "Ignoring device %s while writing cgroup attribute.", a->path); - } - } - - if ((mask & CGROUP_MASK_PIDS) && !is_root) { - - if (c->tasks_max != CGROUP_LIMIT_MAX) { - char buf[DECIMAL_STR_MAX(uint64_t) + 2]; - - sprintf(buf, "%" PRIu64 "\n", c->tasks_max); - r = cg_set_attribute("pids", path, "pids.max", buf); - } else - r = cg_set_attribute("pids", path, "pids.max", "max"); - - if (r < 0) - log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r, - "Failed to set pids.max: %m"); - } -} - -CGroupMask cgroup_context_get_mask(CGroupContext *c) { - CGroupMask mask = 0; - - /* Figure out which controllers we need */ - - if (c->cpu_accounting || - cgroup_context_has_cpu_weight(c) || - cgroup_context_has_cpu_shares(c) || - c->cpu_quota_per_sec_usec != USEC_INFINITY) - mask |= CGROUP_MASK_CPUACCT | CGROUP_MASK_CPU; - - if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c)) - mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO; - - if (c->memory_accounting || - c->memory_limit != CGROUP_LIMIT_MAX || - cgroup_context_has_unified_memory_config(c)) - mask |= CGROUP_MASK_MEMORY; - - if (c->device_allow || - c->device_policy != CGROUP_AUTO) - mask |= CGROUP_MASK_DEVICES; - - if (c->tasks_accounting || - c->tasks_max != (uint64_t) -1) - mask |= CGROUP_MASK_PIDS; - - return mask; -} - -CGroupMask unit_get_own_mask(Unit *u) { - CGroupContext *c; - - /* Returns the mask of controllers the unit needs for itself */ - - c = unit_get_cgroup_context(u); - if (!c) - return 0; - - /* If delegation is turned on, then turn on all cgroups, - * unless we are on the legacy hierarchy and the process we - * fork into it is known to drop privileges, and hence - * shouldn't get access to the controllers. - * - * Note that on the unified hierarchy it is safe to delegate - * controllers to unprivileged services. */ - - if (c->delegate) { - ExecContext *e; - - e = unit_get_exec_context(u); - if (!e || - exec_context_maintains_privileges(e) || - cg_all_unified() > 0) - return _CGROUP_MASK_ALL; - } - - return cgroup_context_get_mask(c); -} - -CGroupMask unit_get_members_mask(Unit *u) { - assert(u); - - /* Returns the mask of controllers all of the unit's children - * require, merged */ - - if (u->cgroup_members_mask_valid) - return u->cgroup_members_mask; - - u->cgroup_members_mask = 0; - - if (u->type == UNIT_SLICE) { - Unit *member; - Iterator i; - - SET_FOREACH(member, u->dependencies[UNIT_BEFORE], i) { - - if (member == u) - continue; - - if (UNIT_DEREF(member->slice) != u) - continue; - - u->cgroup_members_mask |= - unit_get_own_mask(member) | - unit_get_members_mask(member); - } - } - - u->cgroup_members_mask_valid = true; - return u->cgroup_members_mask; -} - -CGroupMask unit_get_siblings_mask(Unit *u) { - assert(u); - - /* Returns the mask of controllers all of the unit's siblings - * require, i.e. the members mask of the unit's parent slice - * if there is one. */ - - if (UNIT_ISSET(u->slice)) - return unit_get_members_mask(UNIT_DEREF(u->slice)); - - return unit_get_own_mask(u) | unit_get_members_mask(u); -} - -CGroupMask unit_get_subtree_mask(Unit *u) { - - /* Returns the mask of this subtree, meaning of the group - * itself and its children. */ - - return unit_get_own_mask(u) | unit_get_members_mask(u); -} - -CGroupMask unit_get_target_mask(Unit *u) { - CGroupMask mask; - - /* This returns the cgroup mask of all controllers to enable - * for a specific cgroup, i.e. everything it needs itself, - * plus all that its children need, plus all that its siblings - * need. This is primarily useful on the legacy cgroup - * hierarchy, where we need to duplicate each cgroup in each - * hierarchy that shall be enabled for it. */ - - mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u); - mask &= u->manager->cgroup_supported; - - return mask; -} - -CGroupMask unit_get_enable_mask(Unit *u) { - CGroupMask mask; - - /* This returns the cgroup mask of all controllers to enable - * for the children of a specific cgroup. This is primarily - * useful for the unified cgroup hierarchy, where each cgroup - * controls which controllers are enabled for its children. */ - - mask = unit_get_members_mask(u); - mask &= u->manager->cgroup_supported; - - return mask; -} - -/* Recurse from a unit up through its containing slices, propagating - * mask bits upward. A unit is also member of itself. */ -void unit_update_cgroup_members_masks(Unit *u) { - CGroupMask m; - bool more; - - assert(u); - - /* Calculate subtree mask */ - m = unit_get_subtree_mask(u); - - /* See if anything changed from the previous invocation. If - * not, we're done. */ - if (u->cgroup_subtree_mask_valid && m == u->cgroup_subtree_mask) - return; - - more = - u->cgroup_subtree_mask_valid && - ((m & ~u->cgroup_subtree_mask) != 0) && - ((~m & u->cgroup_subtree_mask) == 0); - - u->cgroup_subtree_mask = m; - u->cgroup_subtree_mask_valid = true; - - if (UNIT_ISSET(u->slice)) { - Unit *s = UNIT_DEREF(u->slice); - - if (more) - /* There's more set now than before. We - * propagate the new mask to the parent's mask - * (not caring if it actually was valid or - * not). */ - - s->cgroup_members_mask |= m; - - else - /* There's less set now than before (or we - * don't know), we need to recalculate - * everything, so let's invalidate the - * parent's members mask */ - - s->cgroup_members_mask_valid = false; - - /* And now make sure that this change also hits our - * grandparents */ - unit_update_cgroup_members_masks(s); - } -} - -static const char *migrate_callback(CGroupMask mask, void *userdata) { - Unit *u = userdata; - - assert(mask != 0); - assert(u); - - while (u) { - if (u->cgroup_path && - u->cgroup_realized && - (u->cgroup_realized_mask & mask) == mask) - return u->cgroup_path; - - u = UNIT_DEREF(u->slice); - } - - return NULL; -} - -char *unit_default_cgroup_path(Unit *u) { - _cleanup_free_ char *escaped = NULL, *slice = NULL; - int r; - - assert(u); - - if (unit_has_name(u, SPECIAL_ROOT_SLICE)) - return strdup(u->manager->cgroup_root); - - if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) { - r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice); - if (r < 0) - return NULL; - } - - escaped = cg_escape(u->id); - if (!escaped) - return NULL; - - if (slice) - return strjoin(u->manager->cgroup_root, "/", slice, "/", escaped, NULL); - else - return strjoin(u->manager->cgroup_root, "/", escaped, NULL); -} - -int unit_set_cgroup_path(Unit *u, const char *path) { - _cleanup_free_ char *p = NULL; - int r; - - assert(u); - - if (path) { - p = strdup(path); - if (!p) - return -ENOMEM; - } else - p = NULL; - - if (streq_ptr(u->cgroup_path, p)) - return 0; - - if (p) { - r = hashmap_put(u->manager->cgroup_unit, p, u); - if (r < 0) - return r; - } - - unit_release_cgroup(u); - - u->cgroup_path = p; - p = NULL; - - return 1; -} - -int unit_watch_cgroup(Unit *u) { - _cleanup_free_ char *events = NULL; - int r; - - assert(u); - - if (!u->cgroup_path) - return 0; - - if (u->cgroup_inotify_wd >= 0) - return 0; - - /* Only applies to the unified hierarchy */ - r = cg_unified(SYSTEMD_CGROUP_CONTROLLER); - if (r < 0) - return log_unit_error_errno(u, r, "Failed detect whether the unified hierarchy is used: %m"); - if (r == 0) - return 0; - - /* Don't watch the root slice, it's pointless. */ - if (unit_has_name(u, SPECIAL_ROOT_SLICE)) - return 0; - - r = hashmap_ensure_allocated(&u->manager->cgroup_inotify_wd_unit, &trivial_hash_ops); - if (r < 0) - return log_oom(); - - r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events); - if (r < 0) - return log_oom(); - - u->cgroup_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY); - if (u->cgroup_inotify_wd < 0) { - - if (errno == ENOENT) /* If the directory is already - * gone we don't need to track - * it, so this is not an error */ - return 0; - - return log_unit_error_errno(u, errno, "Failed to add inotify watch descriptor for control group %s: %m", u->cgroup_path); - } - - r = hashmap_put(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd), u); - if (r < 0) - return log_unit_error_errno(u, r, "Failed to add inotify watch descriptor to hash map: %m"); - - return 0; -} - -static int unit_create_cgroup( - Unit *u, - CGroupMask target_mask, - CGroupMask enable_mask) { - - CGroupContext *c; - int r; - - assert(u); - - c = unit_get_cgroup_context(u); - if (!c) - return 0; - - if (!u->cgroup_path) { - _cleanup_free_ char *path = NULL; - - path = unit_default_cgroup_path(u); - if (!path) - return log_oom(); - - r = unit_set_cgroup_path(u, path); - if (r == -EEXIST) - return log_unit_error_errno(u, r, "Control group %s exists already.", path); - if (r < 0) - return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path); - } - - /* First, create our own group */ - r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path); - if (r < 0) - return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path); - - /* Start watching it */ - (void) unit_watch_cgroup(u); - - /* Enable all controllers we need */ - r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path); - if (r < 0) - log_unit_warning_errno(u, r, "Failed to enable controllers on cgroup %s, ignoring: %m", u->cgroup_path); - - /* Keep track that this is now realized */ - u->cgroup_realized = true; - u->cgroup_realized_mask = target_mask; - u->cgroup_enabled_mask = enable_mask; - - if (u->type != UNIT_SLICE && !c->delegate) { - - /* Then, possibly move things over, but not if - * subgroups may contain processes, which is the case - * for slice and delegation units. */ - r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u); - if (r < 0) - log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path); - } - - return 0; -} - -int unit_attach_pids_to_cgroup(Unit *u) { - int r; - assert(u); - - r = unit_realize_cgroup(u); - if (r < 0) - return r; - - r = cg_attach_many_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->pids, migrate_callback, u); - if (r < 0) - return r; - - return 0; -} - -static void cgroup_xattr_apply(Unit *u) { - char ids[SD_ID128_STRING_MAX]; - int r; - - assert(u); - - if (!MANAGER_IS_SYSTEM(u->manager)) - return; - - if (sd_id128_is_null(u->invocation_id)) - return; - - r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, - "trusted.invocation_id", - sd_id128_to_string(u->invocation_id, ids), 32, - 0); - if (r < 0) - log_unit_warning_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path); -} - -static bool unit_has_mask_realized(Unit *u, CGroupMask target_mask, CGroupMask enable_mask) { - assert(u); - - return u->cgroup_realized && u->cgroup_realized_mask == target_mask && u->cgroup_enabled_mask == enable_mask; -} - -/* Check if necessary controllers and attributes for a unit are in place. - * - * If so, do nothing. - * If not, create paths, move processes over, and set attributes. - * - * Returns 0 on success and < 0 on failure. */ -static int unit_realize_cgroup_now(Unit *u, ManagerState state) { - CGroupMask target_mask, enable_mask; - int r; - - assert(u); - - if (u->in_cgroup_queue) { - LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u); - u->in_cgroup_queue = false; - } - - target_mask = unit_get_target_mask(u); - enable_mask = unit_get_enable_mask(u); - - if (unit_has_mask_realized(u, target_mask, enable_mask)) - return 0; - - /* First, realize parents */ - if (UNIT_ISSET(u->slice)) { - r = unit_realize_cgroup_now(UNIT_DEREF(u->slice), state); - if (r < 0) - return r; - } - - /* And then do the real work */ - r = unit_create_cgroup(u, target_mask, enable_mask); - if (r < 0) - return r; - - /* Finally, apply the necessary attributes. */ - cgroup_context_apply(u, target_mask, state); - cgroup_xattr_apply(u); - - return 0; -} - -static void unit_add_to_cgroup_queue(Unit *u) { - - if (u->in_cgroup_queue) - return; - - LIST_PREPEND(cgroup_queue, u->manager->cgroup_queue, u); - u->in_cgroup_queue = true; -} - -unsigned manager_dispatch_cgroup_queue(Manager *m) { - ManagerState state; - unsigned n = 0; - Unit *i; - int r; - - state = manager_state(m); - - while ((i = m->cgroup_queue)) { - assert(i->in_cgroup_queue); - - r = unit_realize_cgroup_now(i, state); - if (r < 0) - log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id); - - n++; - } - - return n; -} - -static void unit_queue_siblings(Unit *u) { - Unit *slice; - - /* This adds the siblings of the specified unit and the - * siblings of all parent units to the cgroup queue. (But - * neither the specified unit itself nor the parents.) */ - - while ((slice = UNIT_DEREF(u->slice))) { - Iterator i; - Unit *m; - - SET_FOREACH(m, slice->dependencies[UNIT_BEFORE], i) { - if (m == u) - continue; - - /* Skip units that have a dependency on the slice - * but aren't actually in it. */ - if (UNIT_DEREF(m->slice) != slice) - continue; - - /* No point in doing cgroup application for units - * without active processes. */ - if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m))) - continue; - - /* If the unit doesn't need any new controllers - * and has current ones realized, it doesn't need - * any changes. */ - if (unit_has_mask_realized(m, unit_get_target_mask(m), unit_get_enable_mask(m))) - continue; - - unit_add_to_cgroup_queue(m); - } - - u = slice; - } -} - -int unit_realize_cgroup(Unit *u) { - assert(u); - - if (!UNIT_HAS_CGROUP_CONTEXT(u)) - return 0; - - /* So, here's the deal: when realizing the cgroups for this - * unit, we need to first create all parents, but there's more - * actually: for the weight-based controllers we also need to - * make sure that all our siblings (i.e. units that are in the - * same slice as we are) have cgroups, too. Otherwise, things - * would become very uneven as each of their processes would - * get as much resources as all our group together. This call - * will synchronously create the parent cgroups, but will - * defer work on the siblings to the next event loop - * iteration. */ - - /* Add all sibling slices to the cgroup queue. */ - unit_queue_siblings(u); - - /* And realize this one now (and apply the values) */ - return unit_realize_cgroup_now(u, manager_state(u->manager)); -} - -void unit_release_cgroup(Unit *u) { - assert(u); - - /* Forgets all cgroup details for this cgroup */ - - if (u->cgroup_path) { - (void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); - u->cgroup_path = mfree(u->cgroup_path); - } - - if (u->cgroup_inotify_wd >= 0) { - if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_inotify_wd) < 0) - log_unit_debug_errno(u, errno, "Failed to remove cgroup inotify watch %i for %s, ignoring", u->cgroup_inotify_wd, u->id); - - (void) hashmap_remove(u->manager->cgroup_inotify_wd_unit, INT_TO_PTR(u->cgroup_inotify_wd)); - u->cgroup_inotify_wd = -1; - } -} - -void unit_prune_cgroup(Unit *u) { - int r; - bool is_root_slice; - - assert(u); - - /* Removes the cgroup, if empty and possible, and stops watching it. */ - - if (!u->cgroup_path) - return; - - (void) unit_get_cpu_usage(u, NULL); /* Cache the last CPU usage value before we destroy the cgroup */ - - is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE); - - r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice); - if (r < 0) { - log_unit_debug_errno(u, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path); - return; - } - - if (is_root_slice) - return; - - unit_release_cgroup(u); - - u->cgroup_realized = false; - u->cgroup_realized_mask = 0; - u->cgroup_enabled_mask = 0; -} - -int unit_search_main_pid(Unit *u, pid_t *ret) { - _cleanup_fclose_ FILE *f = NULL; - pid_t pid = 0, npid, mypid; - int r; - - assert(u); - assert(ret); - - if (!u->cgroup_path) - return -ENXIO; - - r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f); - if (r < 0) - return r; - - mypid = getpid(); - while (cg_read_pid(f, &npid) > 0) { - pid_t ppid; - - if (npid == pid) - continue; - - /* Ignore processes that aren't our kids */ - if (get_process_ppid(npid, &ppid) >= 0 && ppid != mypid) - continue; - - if (pid != 0) - /* Dang, there's more than one daemonized PID - in this group, so we don't know what process - is the main process. */ - - return -ENODATA; - - pid = npid; - } - - *ret = pid; - return 0; -} - -static int unit_watch_pids_in_path(Unit *u, const char *path) { - _cleanup_closedir_ DIR *d = NULL; - _cleanup_fclose_ FILE *f = NULL; - int ret = 0, r; - - assert(u); - assert(path); - - r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f); - if (r < 0) - ret = r; - else { - pid_t pid; - - while ((r = cg_read_pid(f, &pid)) > 0) { - r = unit_watch_pid(u, pid); - if (r < 0 && ret >= 0) - ret = r; - } - - if (r < 0 && ret >= 0) - ret = r; - } - - r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d); - if (r < 0) { - if (ret >= 0) - ret = r; - } else { - char *fn; - - while ((r = cg_read_subgroup(d, &fn)) > 0) { - _cleanup_free_ char *p = NULL; - - p = strjoin(path, "/", fn, NULL); - free(fn); - - if (!p) - return -ENOMEM; - - r = unit_watch_pids_in_path(u, p); - if (r < 0 && ret >= 0) - ret = r; - } - - if (r < 0 && ret >= 0) - ret = r; - } - - return ret; -} - -int unit_watch_all_pids(Unit *u) { - assert(u); - - /* Adds all PIDs from our cgroup to the set of PIDs we - * watch. This is a fallback logic for cases where we do not - * get reliable cgroup empty notifications: we try to use - * SIGCHLD as replacement. */ - - if (!u->cgroup_path) - return -ENOENT; - - if (cg_unified(SYSTEMD_CGROUP_CONTROLLER) > 0) /* On unified we can use proper notifications */ - return 0; - - return unit_watch_pids_in_path(u, u->cgroup_path); -} - -int unit_notify_cgroup_empty(Unit *u) { - int r; - - assert(u); - - if (!u->cgroup_path) - return 0; - - r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path); - if (r <= 0) - return r; - - unit_add_to_gc_queue(u); - - if (UNIT_VTABLE(u)->notify_cgroup_empty) - UNIT_VTABLE(u)->notify_cgroup_empty(u); - - return 0; -} - -static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) { - Manager *m = userdata; - - assert(s); - assert(fd >= 0); - assert(m); - - for (;;) { - union inotify_event_buffer buffer; - struct inotify_event *e; - ssize_t l; - - l = read(fd, &buffer, sizeof(buffer)); - if (l < 0) { - if (errno == EINTR || errno == EAGAIN) - return 0; - - return log_error_errno(errno, "Failed to read control group inotify events: %m"); - } - - FOREACH_INOTIFY_EVENT(e, buffer, l) { - Unit *u; - - if (e->wd < 0) - /* Queue overflow has no watch descriptor */ - continue; - - if (e->mask & IN_IGNORED) - /* The watch was just removed */ - continue; - - u = hashmap_get(m->cgroup_inotify_wd_unit, INT_TO_PTR(e->wd)); - if (!u) /* Not that inotify might deliver - * events for a watch even after it - * was removed, because it was queued - * before the removal. Let's ignore - * this here safely. */ - continue; - - (void) unit_notify_cgroup_empty(u); - } - } -} - -int manager_setup_cgroup(Manager *m) { - _cleanup_free_ char *path = NULL; - CGroupController c; - int r, all_unified, systemd_unified; - char *e; - - assert(m); - - /* 1. Determine hierarchy */ - m->cgroup_root = mfree(m->cgroup_root); - r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); - if (r < 0) - return log_error_errno(r, "Cannot determine cgroup we are running in: %m"); - - /* Chop off the init scope, if we are already located in it */ - e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); - - /* LEGACY: Also chop off the system slice if we are in - * it. This is to support live upgrades from older systemd - * versions where PID 1 was moved there. Also see - * cg_get_root_path(). */ - if (!e && MANAGER_IS_SYSTEM(m)) { - e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); - if (!e) - e = endswith(m->cgroup_root, "/system"); /* even more legacy */ - } - if (e) - *e = 0; - - /* And make sure to store away the root value without trailing - * slash, even for the root dir, so that we can easily prepend - * it everywhere. */ - while ((e = endswith(m->cgroup_root, "/"))) - *e = 0; - - /* 2. Show data */ - r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); - if (r < 0) - return log_error_errno(r, "Cannot find cgroup mount point: %m"); - - all_unified = cg_all_unified(); - systemd_unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER); - - if (all_unified < 0 || systemd_unified < 0) - return log_error_errno(all_unified < 0 ? all_unified : systemd_unified, - "Couldn't determine if we are running in the unified hierarchy: %m"); - - if (all_unified > 0) - log_debug("Unified cgroup hierarchy is located at %s.", path); - else if (systemd_unified > 0) - log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path); - else - log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); - - if (!m->test_run) { - const char *scope_path; - - /* 3. Install agent */ - if (systemd_unified) { - - /* In the unified hierarchy we can get - * cgroup empty notifications via inotify. */ - - m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); - safe_close(m->cgroup_inotify_fd); - - m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); - if (m->cgroup_inotify_fd < 0) - return log_error_errno(errno, "Failed to create control group inotify object: %m"); - - r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m); - if (r < 0) - return log_error_errno(r, "Failed to watch control group inotify object: %m"); - - /* Process cgroup empty notifications early, but after service notifications and SIGCHLD. Also - * see handling of cgroup agent notifications, for the classic cgroup hierarchy support. */ - r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-5); - if (r < 0) - return log_error_errno(r, "Failed to set priority of inotify event source: %m"); - - (void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify"); - - } else if (MANAGER_IS_SYSTEM(m)) { - - /* On the legacy hierarchy we only get - * notifications via cgroup agents. (Which - * isn't really reliable, since it does not - * generate events when control groups with - * children run empty. */ - - r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); - if (r < 0) - log_warning_errno(r, "Failed to install release agent, ignoring: %m"); - else if (r > 0) - log_debug("Installed release agent."); - else if (r == 0) - log_debug("Release agent already installed."); - } - - /* 4. Make sure we are in the special "init.scope" unit in the root slice. */ - scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE); - r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0); - if (r < 0) - return log_error_errno(r, "Failed to create %s control group: %m", scope_path); - - /* also, move all other userspace processes remaining - * in the root cgroup into that scope. */ - r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0); - if (r < 0) - log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m"); - - /* 5. And pin it, so that it cannot be unmounted */ - safe_close(m->pin_cgroupfs_fd); - m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); - if (m->pin_cgroupfs_fd < 0) - return log_error_errno(errno, "Failed to open pin file: %m"); - - /* 6. Always enable hierarchical support if it exists... */ - if (!all_unified) - (void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1"); - } - - /* 7. Figure out which controllers are supported */ - r = cg_mask_supported(&m->cgroup_supported); - if (r < 0) - return log_error_errno(r, "Failed to determine supported controllers: %m"); - - for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) - log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c))); - - return 0; -} - -void manager_shutdown_cgroup(Manager *m, bool delete) { - assert(m); - - /* We can't really delete the group, since we are in it. But - * let's trim it. */ - if (delete && m->cgroup_root) - (void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); - - m->cgroup_inotify_wd_unit = hashmap_free(m->cgroup_inotify_wd_unit); - - m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source); - m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd); - - m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd); - - m->cgroup_root = mfree(m->cgroup_root); -} - -Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) { - char *p; - Unit *u; - - assert(m); - assert(cgroup); - - u = hashmap_get(m->cgroup_unit, cgroup); - if (u) - return u; - - p = strdupa(cgroup); - for (;;) { - char *e; - - e = strrchr(p, '/'); - if (!e || e == p) - return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE); - - *e = 0; - - u = hashmap_get(m->cgroup_unit, p); - if (u) - return u; - } -} - -Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) { - _cleanup_free_ char *cgroup = NULL; - int r; - - assert(m); - - if (pid <= 0) - return NULL; - - r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup); - if (r < 0) - return NULL; - - return manager_get_unit_by_cgroup(m, cgroup); -} - -Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { - Unit *u; - - assert(m); - - if (pid <= 0) - return NULL; - - if (pid == 1) - return hashmap_get(m->units, SPECIAL_INIT_SCOPE); - - u = hashmap_get(m->watch_pids1, PID_TO_PTR(pid)); - if (u) - return u; - - u = hashmap_get(m->watch_pids2, PID_TO_PTR(pid)); - if (u) - return u; - - return manager_get_unit_by_pid_cgroup(m, pid); -} - -int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { - Unit *u; - - assert(m); - assert(cgroup); - - log_debug("Got cgroup empty notification for: %s", cgroup); - - u = manager_get_unit_by_cgroup(m, cgroup); - if (!u) - return 0; - - return unit_notify_cgroup_empty(u); -} - -int unit_get_memory_current(Unit *u, uint64_t *ret) { - _cleanup_free_ char *v = NULL; - int r; - - assert(u); - assert(ret); - - if (!u->cgroup_path) - return -ENODATA; - - if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0) - return -ENODATA; - - if (cg_all_unified() <= 0) - r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &v); - else - r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v); - if (r == -ENOENT) - return -ENODATA; - if (r < 0) - return r; - - return safe_atou64(v, ret); -} - -int unit_get_tasks_current(Unit *u, uint64_t *ret) { - _cleanup_free_ char *v = NULL; - int r; - - assert(u); - assert(ret); - - if (!u->cgroup_path) - return -ENODATA; - - if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0) - return -ENODATA; - - r = cg_get_attribute("pids", u->cgroup_path, "pids.current", &v); - if (r == -ENOENT) - return -ENODATA; - if (r < 0) - return r; - - return safe_atou64(v, ret); -} - -static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) { - _cleanup_free_ char *v = NULL; - uint64_t ns; - int r; - - assert(u); - assert(ret); - - if (!u->cgroup_path) - return -ENODATA; - - if (cg_all_unified() > 0) { - const char *keys[] = { "usage_usec", NULL }; - _cleanup_free_ char *val = NULL; - uint64_t us; - - if ((u->cgroup_realized_mask & CGROUP_MASK_CPU) == 0) - return -ENODATA; - - r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", keys, &val); - if (r < 0) - return r; - - r = safe_atou64(val, &us); - if (r < 0) - return r; - - ns = us * NSEC_PER_USEC; - } else { - if ((u->cgroup_realized_mask & CGROUP_MASK_CPUACCT) == 0) - return -ENODATA; - - r = cg_get_attribute("cpuacct", u->cgroup_path, "cpuacct.usage", &v); - if (r == -ENOENT) - return -ENODATA; - if (r < 0) - return r; - - r = safe_atou64(v, &ns); - if (r < 0) - return r; - } - - *ret = ns; - return 0; -} - -int unit_get_cpu_usage(Unit *u, nsec_t *ret) { - nsec_t ns; - int r; - - assert(u); - - /* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was - * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply - * call this function with a NULL return value. */ - - r = unit_get_cpu_usage_raw(u, &ns); - if (r == -ENODATA && u->cpu_usage_last != NSEC_INFINITY) { - /* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our - * cached value. */ - - if (ret) - *ret = u->cpu_usage_last; - return 0; - } - if (r < 0) - return r; - - if (ns > u->cpu_usage_base) - ns -= u->cpu_usage_base; - else - ns = 0; - - u->cpu_usage_last = ns; - if (ret) - *ret = ns; - - return 0; -} - -int unit_reset_cpu_usage(Unit *u) { - nsec_t ns; - int r; - - assert(u); - - u->cpu_usage_last = NSEC_INFINITY; - - r = unit_get_cpu_usage_raw(u, &ns); - if (r < 0) { - u->cpu_usage_base = 0; - return r; - } - - u->cpu_usage_base = ns; - return 0; -} - -bool unit_cgroup_delegate(Unit *u) { - CGroupContext *c; - - assert(u); - - c = unit_get_cgroup_context(u); - if (!c) - return false; - - return c->delegate; -} - -void unit_invalidate_cgroup(Unit *u, CGroupMask m) { - assert(u); - - if (!UNIT_HAS_CGROUP_CONTEXT(u)) - return; - - if (m == 0) - return; - - /* always invalidate compat pairs together */ - if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO)) - m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO; - - if ((u->cgroup_realized_mask & m) == 0) - return; - - u->cgroup_realized_mask &= ~m; - unit_add_to_cgroup_queue(u); -} - -void manager_invalidate_startup_units(Manager *m) { - Iterator i; - Unit *u; - - assert(m); - - SET_FOREACH(u, m->startup_units, i) - unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO); -} - -static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = { - [CGROUP_AUTO] = "auto", - [CGROUP_CLOSED] = "closed", - [CGROUP_STRICT] = "strict", -}; - -DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy); |