| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| 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 "path-util.h" |
| #include "special.h" |
| #include "cgroup-util.h" |
| #include "cgroup.h" |
| |
| void cgroup_context_init(CGroupContext *c) { |
| assert(c); |
| |
| /* Initialize everything to the kernel defaults, assuming the |
| * structure is preinitialized to 0 */ |
| |
| c->cpu_shares = 1024; |
| c->memory_limit = (uint64_t) -1; |
| c->blockio_weight = 1000; |
| } |
| |
| 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_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->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) { |
| CGroupBlockIODeviceBandwidth *b; |
| CGroupBlockIODeviceWeight *w; |
| CGroupDeviceAllow *a; |
| |
| assert(c); |
| assert(f); |
| |
| prefix = strempty(prefix); |
| |
| fprintf(f, |
| "%sCPUAccounting=%s\n" |
| "%sBlockIOAccounting=%s\n" |
| "%sMemoryAccounting=%s\n" |
| "%sCPUShares=%lu\n" |
| "%sBlockIOWeight=%lu\n" |
| "%sMemoryLimit=%" PRIu64 "\n" |
| "%sDevicePolicy=%s\n", |
| prefix, yes_no(c->cpu_accounting), |
| prefix, yes_no(c->blockio_accounting), |
| prefix, yes_no(c->memory_accounting), |
| prefix, c->cpu_shares, |
| prefix, c->blockio_weight, |
| prefix, c->memory_limit, |
| prefix, cgroup_device_policy_to_string(c->device_policy)); |
| |
| 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, w, c->blockio_device_weights) |
| fprintf(f, |
| "%sBlockIODeviceWeight=%s %lu", |
| prefix, |
| w->path, |
| w->weight); |
| |
| LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { |
| char buf[FORMAT_BYTES_MAX]; |
| |
| fprintf(f, |
| "%s%s=%s %s\n", |
| prefix, |
| b->read ? "BlockIOReadBandwidth" : "BlockIOWriteBandwidth", |
| b->path, |
| format_bytes(buf, sizeof(buf), b->bandwidth)); |
| } |
| } |
| |
| static int lookup_blkio_device(const char *p, dev_t *dev) { |
| struct stat st; |
| int r; |
| |
| assert(p); |
| assert(dev); |
| |
| r = stat(p, &st); |
| if (r < 0) { |
| log_warning("Couldn't stat device %s: %m", p); |
| return -errno; |
| } |
| |
| 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_warning("Failed to set devices.allow on %s: %s", path, strerror(-r)); |
| |
| 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) { |
| log_warning("Cannot open /proc/devices to resolve %s (%c): %m", name, type); |
| return -errno; |
| } |
| |
| 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 (!streq(w, name)) |
| continue; |
| |
| sprintf(buf, |
| "%c %u:* %s", |
| type, |
| maj, |
| acc); |
| |
| r = cg_set_attribute("devices", path, "devices.allow", buf); |
| if (r < 0) |
| log_warning("Failed to set devices.allow on %s: %s", path, strerror(-r)); |
| } |
| |
| return 0; |
| |
| fail: |
| log_warning("Failed to read /proc/devices: %m"); |
| return -errno; |
| } |
| |
| void cgroup_context_apply(CGroupContext *c, CGroupControllerMask mask, const char *path) { |
| bool is_root; |
| int r; |
| |
| assert(c); |
| assert(path); |
| |
| if (mask == 0) |
| return; |
| |
| /* Some cgroup attributes are not support on the root cgroup, |
| * hence silently ignore */ |
| is_root = isempty(path) || path_equal(path, "/"); |
| |
| if ((mask & CGROUP_CPU) && !is_root) { |
| char buf[DECIMAL_STR_MAX(unsigned long) + 1]; |
| |
| sprintf(buf, "%lu\n", c->cpu_shares); |
| r = cg_set_attribute("cpu", path, "cpu.shares", buf); |
| if (r < 0) |
| log_warning("Failed to set cpu.shares on %s: %s", path, strerror(-r)); |
| } |
| |
| if (mask & CGROUP_BLKIO) { |
| char buf[MAX3(DECIMAL_STR_MAX(unsigned long)+1, |
| DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(unsigned long)*1, |
| DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1)]; |
| CGroupBlockIODeviceWeight *w; |
| CGroupBlockIODeviceBandwidth *b; |
| |
| if (!is_root) { |
| sprintf(buf, "%lu\n", c->blockio_weight); |
| r = cg_set_attribute("blkio", path, "blkio.weight", buf); |
| if (r < 0) |
| log_warning("Failed to set blkio.weight on %s: %s", path, strerror(-r)); |
| |
| /* FIXME: no way to reset this list */ |
| LIST_FOREACH(device_weights, w, c->blockio_device_weights) { |
| dev_t dev; |
| |
| r = lookup_blkio_device(w->path, &dev); |
| if (r < 0) |
| continue; |
| |
| sprintf(buf, "%u:%u %lu", major(dev), minor(dev), w->weight); |
| r = cg_set_attribute("blkio", path, "blkio.weight_device", buf); |
| if (r < 0) |
| log_error("Failed to set blkio.weight_device on %s: %s", path, strerror(-r)); |
| } |
| } |
| |
| /* FIXME: no way to reset this list */ |
| LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) { |
| const char *a; |
| dev_t dev; |
| |
| r = lookup_blkio_device(b->path, &dev); |
| if (r < 0) |
| continue; |
| |
| a = b->read ? "blkio.throttle.read_bps_device" : "blkio.throttle.write_bps_device"; |
| |
| sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), b->bandwidth); |
| r = cg_set_attribute("blkio", path, a, buf); |
| if (r < 0) |
| log_error("Failed to set %s on %s: %s", a, path, strerror(-r)); |
| } |
| } |
| |
| if (mask & CGROUP_MEMORY) { |
| if (c->memory_limit != (uint64_t) -1) { |
| char buf[DECIMAL_STR_MAX(uint64_t) + 1]; |
| |
| sprintf(buf, "%" PRIu64 "\n", c->memory_limit); |
| r = cg_set_attribute("memory", path, "memory.limit_in_bytes", buf); |
| } else |
| r = cg_set_attribute("memory", path, "memory.limit_in_bytes", "-1"); |
| |
| if (r < 0) |
| log_error("Failed to set memory.limit_in_bytes on %s: %s", path, strerror(-r)); |
| } |
| |
| if ((mask & CGROUP_DEVICE) && !is_root) { |
| CGroupDeviceAllow *a; |
| |
| 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_warning("Failed to reset devices.list on %s: %s", path, strerror(-r)); |
| |
| if (c->device_policy == CGROUP_CLOSED || |
| (c->device_policy == CGROUP_AUTO && c->device_allow)) { |
| static const char auto_devices[] = |
| "/dev/null\0" "rw\0" |
| "/dev/zero\0" "rw\0" |
| "/dev/full\0" "rw\0" |
| "/dev/random\0" "rw\0" |
| "/dev/urandom\0" "rw\0"; |
| |
| const char *x, *y; |
| |
| NULSTR_FOREACH_PAIR(x, y, auto_devices) |
| whitelist_device(path, x, y); |
| } |
| |
| 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_debug("Ignoring device %s while writing cgroup attribute.", a->path); |
| } |
| } |
| } |
| |
| CGroupControllerMask cgroup_context_get_mask(CGroupContext *c) { |
| CGroupControllerMask mask = 0; |
| |
| /* Figure out which controllers we need */ |
| |
| if (c->cpu_accounting || c->cpu_shares != 1024) |
| mask |= CGROUP_CPUACCT | CGROUP_CPU; |
| |
| if (c->blockio_accounting || |
| c->blockio_weight != 1000 || |
| c->blockio_device_weights || |
| c->blockio_device_bandwidths) |
| mask |= CGROUP_BLKIO; |
| |
| if (c->memory_accounting || |
| c->memory_limit != (uint64_t) -1) |
| mask |= CGROUP_MEMORY; |
| |
| if (c->device_allow || c->device_policy != CGROUP_AUTO) |
| mask |= CGROUP_DEVICE; |
| |
| return mask; |
| } |
| |
| CGroupControllerMask unit_get_cgroup_mask(Unit *u) { |
| CGroupContext *c; |
| |
| c = unit_get_cgroup_context(u); |
| if (!c) |
| return 0; |
| |
| return cgroup_context_get_mask(c); |
| } |
| |
| CGroupControllerMask unit_get_members_mask(Unit *u) { |
| assert(u); |
| |
| 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_cgroup_mask(member) | |
| unit_get_members_mask(member); |
| } |
| } |
| |
| u->cgroup_members_mask_valid = true; |
| return u->cgroup_members_mask; |
| } |
| |
| CGroupControllerMask unit_get_siblings_mask(Unit *u) { |
| CGroupControllerMask m; |
| |
| assert(u); |
| |
| if (UNIT_ISSET(u->slice)) |
| m = unit_get_members_mask(UNIT_DEREF(u->slice)); |
| else |
| m = unit_get_cgroup_mask(u) | unit_get_members_mask(u); |
| |
| /* Sibling propagation is only relevant for weight-based |
| * controllers, so let's mask out everything else */ |
| return m & (CGROUP_CPU|CGROUP_BLKIO|CGROUP_CPUACCT); |
| } |
| |
| CGroupControllerMask unit_get_target_mask(Unit *u) { |
| CGroupControllerMask mask; |
| |
| mask = unit_get_cgroup_mask(u) | unit_get_members_mask(u) | unit_get_siblings_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) { |
| CGroupControllerMask m; |
| bool more; |
| |
| assert(u); |
| |
| /* Calculate subtree mask */ |
| m = unit_get_cgroup_mask(u) | unit_get_members_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(CGroupControllerMask 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; |
| } |
| |
| static int unit_create_cgroups(Unit *u, CGroupControllerMask mask) { |
| _cleanup_free_ char *path = NULL; |
| int r; |
| |
| assert(u); |
| |
| path = unit_default_cgroup_path(u); |
| if (!path) |
| return log_oom(); |
| |
| r = hashmap_put(u->manager->cgroup_unit, path, u); |
| if (r < 0) { |
| log_error(r == -EEXIST ? "cgroup %s exists already: %s" : "hashmap_put failed for %s: %s", path, strerror(-r)); |
| return r; |
| } |
| if (r > 0) { |
| u->cgroup_path = path; |
| path = NULL; |
| } |
| |
| /* First, create our own group */ |
| r = cg_create_everywhere(u->manager->cgroup_supported, mask, u->cgroup_path); |
| if (r < 0) { |
| log_error("Failed to create cgroup %s: %s", u->cgroup_path, strerror(-r)); |
| return r; |
| } |
| |
| /* Keep track that this is now realized */ |
| u->cgroup_realized = true; |
| u->cgroup_realized_mask = mask; |
| |
| /* Then, possibly move things over */ |
| r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u); |
| if (r < 0) |
| log_warning("Failed to migrate cgroup from to %s: %s", u->cgroup_path, strerror(-r)); |
| |
| return 0; |
| } |
| |
| static bool unit_has_mask_realized(Unit *u, CGroupControllerMask mask) { |
| assert(u); |
| |
| return u->cgroup_realized && u->cgroup_realized_mask == 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) { |
| CGroupControllerMask mask; |
| int r; |
| |
| assert(u); |
| |
| if (u->in_cgroup_queue) { |
| LIST_REMOVE(cgroup_queue, u->manager->cgroup_queue, u); |
| u->in_cgroup_queue = false; |
| } |
| |
| mask = unit_get_target_mask(u); |
| |
| if (unit_has_mask_realized(u, mask)) |
| return 0; |
| |
| /* First, realize parents */ |
| if (UNIT_ISSET(u->slice)) { |
| r = unit_realize_cgroup_now(UNIT_DEREF(u->slice)); |
| if (r < 0) |
| return r; |
| } |
| |
| /* And then do the real work */ |
| r = unit_create_cgroups(u, mask); |
| if (r < 0) |
| return r; |
| |
| /* Finally, apply the necessary attributes. */ |
| cgroup_context_apply(unit_get_cgroup_context(u), mask, u->cgroup_path); |
| |
| 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) { |
| Unit *i; |
| unsigned n = 0; |
| int r; |
| |
| while ((i = m->cgroup_queue)) { |
| assert(i->in_cgroup_queue); |
| |
| r = unit_realize_cgroup_now(i); |
| if (r < 0) |
| log_warning("Failed to realize cgroups for queued unit %s: %s", i->id, strerror(-r)); |
| |
| 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))) |
| continue; |
| |
| unit_add_to_cgroup_queue(m); |
| } |
| |
| u = slice; |
| } |
| } |
| |
| int unit_realize_cgroup(Unit *u) { |
| CGroupContext *c; |
| |
| assert(u); |
| |
| c = unit_get_cgroup_context(u); |
| if (!c) |
| 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); |
| } |
| |
| void unit_destroy_cgroup(Unit *u) { |
| int r; |
| |
| assert(u); |
| |
| if (!u->cgroup_path) |
| return; |
| |
| r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !unit_has_name(u, SPECIAL_ROOT_SLICE)); |
| if (r < 0) |
| log_debug("Failed to destroy cgroup %s: %s", u->cgroup_path, strerror(-r)); |
| |
| hashmap_remove(u->manager->cgroup_unit, u->cgroup_path); |
| |
| free(u->cgroup_path); |
| u->cgroup_path = NULL; |
| u->cgroup_realized = false; |
| u->cgroup_realized_mask = 0; |
| |
| } |
| |
| pid_t unit_search_main_pid(Unit *u) { |
| _cleanup_fclose_ FILE *f = NULL; |
| pid_t pid = 0, npid, mypid; |
| |
| assert(u); |
| |
| if (!u->cgroup_path) |
| return 0; |
| |
| if (cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f) < 0) |
| return 0; |
| |
| 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_parent_of_pid(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. */ |
| pid = 0; |
| break; |
| } |
| |
| pid = npid; |
| } |
| |
| return pid; |
| } |
| |
| int manager_setup_cgroup(Manager *m) { |
| _cleanup_free_ char *path = NULL; |
| char *e; |
| int r; |
| |
| assert(m); |
| |
| /* 0. Be nice to Ingo Molnar #628004 */ |
| if (path_is_mount_point("/sys/fs/cgroup/systemd", false) <= 0) { |
| log_warning("No control group support available, not creating root group."); |
| return 0; |
| } |
| |
| /* 1. Determine hierarchy */ |
| free(m->cgroup_root); |
| m->cgroup_root = NULL; |
| |
| r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root); |
| if (r < 0) { |
| log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); |
| return r; |
| } |
| |
| /* LEGACY: Already in /system.slice? If so, let's cut this |
| * off. This is to support live upgrades from older systemd |
| * versions where PID 1 was moved there. */ |
| if (m->running_as == SYSTEMD_SYSTEM) { |
| e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE); |
| if (!e) |
| e = endswith(m->cgroup_root, "/system"); |
| 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. */ |
| if (streq(m->cgroup_root, "/")) |
| m->cgroup_root[0] = 0; |
| |
| /* 2. Show data */ |
| r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path); |
| if (r < 0) { |
| log_error("Cannot find cgroup mount point: %s", strerror(-r)); |
| return r; |
| } |
| |
| log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); |
| |
| /* 3. Install agent */ |
| if (m->running_as == SYSTEMD_SYSTEM) { |
| r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH); |
| if (r < 0) |
| log_warning("Failed to install release agent, ignoring: %s", strerror(-r)); |
| else if (r > 0) |
| log_debug("Installed release agent."); |
| else |
| log_debug("Release agent already installed."); |
| } |
| |
| /* 4. Make sure we are in the root cgroup */ |
| r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, 0); |
| if (r < 0) { |
| log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); |
| return r; |
| } |
| |
| /* 5. And pin it, so that it cannot be unmounted */ |
| if (m->pin_cgroupfs_fd >= 0) |
| close_nointr_nofail(m->pin_cgroupfs_fd); |
| |
| m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK); |
| if (r < 0) { |
| log_error("Failed to open pin file: %m"); |
| return -errno; |
| } |
| |
| /* 6. Figure out which controllers are supported */ |
| m->cgroup_supported = cg_mask_supported(); |
| |
| /* 7. Always enable hierarchial support if it exists... */ |
| cg_set_attribute("memory", "/", "memory.use_hierarchy", "1"); |
| |
| 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) |
| cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false); |
| |
| if (m->pin_cgroupfs_fd >= 0) { |
| close_nointr_nofail(m->pin_cgroupfs_fd); |
| m->pin_cgroupfs_fd = -1; |
| } |
| |
| free(m->cgroup_root); |
| m->cgroup_root = NULL; |
| } |
| |
| 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 == p || !e) |
| return NULL; |
| |
| *e = 0; |
| |
| u = hashmap_get(m->cgroup_unit, p); |
| if (u) |
| return u; |
| } |
| } |
| |
| Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) { |
| _cleanup_free_ char *cgroup = NULL; |
| int r; |
| |
| assert(m); |
| |
| if (pid <= 1) |
| 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); |
| } |
| |
| int manager_notify_cgroup_empty(Manager *m, const char *cgroup) { |
| Unit *u; |
| int r; |
| |
| assert(m); |
| assert(cgroup); |
| |
| u = manager_get_unit_by_cgroup(m, cgroup); |
| if (u) { |
| r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true); |
| if (r > 0) { |
| if (UNIT_VTABLE(u)->notify_cgroup_empty) |
| UNIT_VTABLE(u)->notify_cgroup_empty(u); |
| |
| unit_add_to_gc_queue(u); |
| } |
| } |
| |
| return 0; |
| } |
| |
| 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); |