| /*** |
| 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; |
| bool ignore_notfound; |
| int r; |
| |
| assert(path); |
| assert(acc); |
| |
| if (node[0] == '-') { |
| /* Non-existent paths starting with "-" must be silently ignored */ |
| node++; |
| ignore_notfound = true; |
| } else |
| ignore_notfound = false; |
| |
| if (stat(node, &st) < 0) { |
| if (errno == ENOENT && ignore_notfound) |
| return 0; |
| |
| return log_warning_errno(errno, "Couldn't stat device %s: %m", node); |
| } |
| |
| 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, 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], *val; |
| 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 ((val = startswith(a->path, "block-"))) |
| whitelist_major(path, val, 'b', acc); |
| else if ((val = startswith(a->path, "char-"))) |
| whitelist_major(path, val, '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); |
| else |
| return strjoin(u->manager->cgroup_root, "/", escaped); |
| } |
| |
| 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_controller(SYSTEMD_CGROUP_CONTROLLER); |
| if (r < 0) |
| return log_error_errno(r, "Failed to determine whether the name=systemd hierarchy is unified: %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); |
| 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) { |
| int r; |
| |
| 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; |
| |
| r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER); |
| if (r < 0) |
| return r; |
| if (r > 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; |
| 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"); |
| |
| r = cg_unified_flush(); |
| if (r < 0) |
| return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m"); |
| |
| all_unified = cg_all_unified(); |
| if (r < 0) |
| return log_error_errno(r, "Couldn't determine whether we are in all unified mode: %m"); |
| if (r > 0) |
| log_debug("Unified cgroup hierarchy is located at %s.", path); |
| else { |
| r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER); |
| if (r < 0) |
| return log_error_errno(r, "Failed to determine whether systemd's own controller is in unified mode: %m"); |
| if (r > 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_LEGACY ". File system hierarchy is at %s.", path); |
| } |
| |
| if (!m->test_run) { |
| const char *scope_path; |
| |
| /* 3. Install agent */ |
| if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) { |
| |
| /* 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; |
| |
| r = cg_all_unified(); |
| if (r < 0) |
| return r; |
| if (r > 0) |
| r = cg_get_attribute("memory", u->cgroup_path, "memory.current", &v); |
| else |
| r = cg_get_attribute("memory", u->cgroup_path, "memory.usage_in_bytes", &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; |
| |
| r = cg_all_unified(); |
| if (r < 0) |
| return r; |
| if (r > 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); |