X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fcore%2Fcgroup.c;h=a248252bcdb26c1eb12000237410ae200d0587df;hp=1f6139e25f752176b2d19781c1253c8e608f8dc9;hb=a32360f1a5a85c12f00e9dfb7353280067cccb5b;hpb=b30e2f4c18ad81b04e4314fd191a5d458553773c diff --git a/src/core/cgroup.c b/src/core/cgroup.c index 1f6139e25..a248252bc 100644 --- a/src/core/cgroup.c +++ b/src/core/cgroup.c @@ -6,16 +6,16 @@ Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or + 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 - General Public License for more details. + Lesser General Public License for more details. - You should have received a copy of the GNU General Public License + You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see . ***/ @@ -30,6 +30,8 @@ #include "cgroup.h" #include "cgroup-util.h" #include "log.h" +#include "strv.h" +#include "path-util.h" int cgroup_bonding_realize(CGroupBonding *b) { int r; @@ -38,7 +40,7 @@ int cgroup_bonding_realize(CGroupBonding *b) { assert(b->path); assert(b->controller); - r = cg_create(b->controller, b->path); + r = cg_create(b->controller, b->path, NULL); if (r < 0) { log_warning("Failed to create cgroup %s:%s: %s", b->controller, b->path, strerror(-r)); return r; @@ -108,30 +110,72 @@ void cgroup_bonding_trim_list(CGroupBonding *first, bool delete_root) { cgroup_bonding_trim(b, delete_root); } -int cgroup_bonding_install(CGroupBonding *b, pid_t pid) { +int cgroup_bonding_install(CGroupBonding *b, pid_t pid, const char *cgroup_suffix) { + _cleanup_free_ char *p = NULL; + const char *path; int r; assert(b); assert(pid >= 0); - if ((r = cg_create_and_attach(b->controller, b->path, pid)) < 0) + if (cgroup_suffix) { + p = strjoin(b->path, "/", cgroup_suffix, NULL); + if (!p) + return -ENOMEM; + + path = p; + } else + path = b->path; + + r = cg_create_and_attach(b->controller, path, pid); + if (r < 0) return r; b->realized = true; return 0; } -int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid) { +int cgroup_bonding_install_list(CGroupBonding *first, pid_t pid, const char *cgroup_suffix) { CGroupBonding *b; int r; - LIST_FOREACH(by_unit, b, first) - if ((r = cgroup_bonding_install(b, pid)) < 0 && b->essential) + LIST_FOREACH(by_unit, b, first) { + r = cgroup_bonding_install(b, pid, cgroup_suffix); + if (r < 0 && b->essential) return r; + } return 0; } +int cgroup_bonding_migrate(CGroupBonding *b, CGroupBonding *list) { + CGroupBonding *q; + int ret = 0; + + LIST_FOREACH(by_unit, q, list) { + int r; + + if (q == b) + continue; + + if (!q->ours) + continue; + + r = cg_migrate_recursive(q->controller, q->path, b->controller, b->path, true, false); + if (r < 0 && ret == 0) + ret = r; + } + + return ret; +} + +int cgroup_bonding_migrate_to(CGroupBonding *b, const char *target, bool rem) { + assert(b); + assert(target); + + return cg_migrate_recursive(b->controller, b->path, b->controller, target, true, rem); +} + int cgroup_bonding_set_group_access(CGroupBonding *b, mode_t mode, uid_t uid, gid_t gid) { assert(b); @@ -176,7 +220,11 @@ int cgroup_bonding_set_task_access_list(CGroupBonding *first, mode_t mode, uid_t return 0; } -int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, Set *s) { +int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) { + char *p = NULL; + const char *path; + int r; + assert(b); assert(sig >= 0); @@ -184,10 +232,22 @@ int cgroup_bonding_kill(CGroupBonding *b, int sig, bool sigcont, Set *s) { if (!b->ours) return 0; - return cg_kill_recursive(b->controller, b->path, sig, sigcont, true, false, s); + if (cgroup_suffix) { + p = strjoin(b->path, "/", cgroup_suffix, NULL); + if (!p) + return -ENOMEM; + + path = p; + } else + path = b->path; + + r = cg_kill_recursive(b->controller, path, sig, sigcont, true, rem, s); + free(p); + + return r; } -int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, Set *s) { +int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, bool rem, Set *s, const char *cgroup_suffix) { CGroupBonding *b; Set *allocated_set = NULL; int ret = -EAGAIN, r; @@ -200,7 +260,8 @@ int cgroup_bonding_kill_list(CGroupBonding *first, int sig, bool sigcont, Set *s return -ENOMEM; LIST_FOREACH(by_unit, b, first) { - if ((r = cgroup_bonding_kill(b, sig, sigcont, s)) < 0) { + r = cgroup_bonding_kill(b, sig, sigcont, rem, s, cgroup_suffix); + if (r < 0) { if (r == -EAGAIN || r == -ESRCH) continue; @@ -258,9 +319,9 @@ int cgroup_bonding_is_empty_list(CGroupBonding *first) { } int manager_setup_cgroup(Manager *m) { - char *current = NULL, *path = NULL; + _cleanup_free_ char *current = NULL, *path = NULL; int r; - char suffix[32]; + char suffix[sizeof("/systemd-") + DECIMAL_STR_MAX(pid_t)]; assert(m); @@ -271,12 +332,13 @@ int manager_setup_cgroup(Manager *m) { } /* 1. Determine hierarchy */ - if ((r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t)) < 0) { + r = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, ¤t); + if (r < 0) { log_error("Cannot determine cgroup we are running in: %s", strerror(-r)); - goto finish; + return r; } - if (m->running_as == MANAGER_SYSTEM) + if (m->running_as == SYSTEMD_SYSTEM) strcpy(suffix, "/system"); else { snprintf(suffix, sizeof(suffix), "/systemd-%lu", (unsigned long) getpid()); @@ -292,52 +354,59 @@ int manager_setup_cgroup(Manager *m) { } else { /* We need a new root cgroup */ m->cgroup_hierarchy = NULL; - if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + if (asprintf(&m->cgroup_hierarchy, "%s%s", streq(current, "/") ? "" : current, suffix) < 0) + return log_oom(); } /* 2. Show data */ - if ((r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path)) < 0) { + r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, NULL, &path); + if (r < 0) { log_error("Cannot find cgroup mount point: %s", strerror(-r)); - goto finish; + return r; } log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER ". File system hierarchy is at %s.", path); /* 3. Install agent */ - if ((r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH)) < 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."); + 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. Realize the group */ - if ((r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0)) < 0) { + r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, 0); + if (r < 0) { log_error("Failed to create root cgroup hierarchy: %s", strerror(-r)); - goto finish; + 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); - if ((m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK)) < 0) { + 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"); - r = -errno; - goto finish; + return -errno; } - log_debug("Created root group."); + /* 6. Remove non-existing controllers from the default controllers list */ + cg_shorten_controllers(m->default_controllers); -finish: - free(current); - free(path); + /* 7. Let's create the user and machine hierarchies + * right-away, so that people can inotify on them, if they + * wish, without this being racy. */ + if (m->running_as == SYSTEMD_SYSTEM) { + cg_create(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, "../user"); + cg_create(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_hierarchy, "../machine"); + } - return r; + return 0; } void manager_shutdown_cgroup(Manager *m, bool delete) { @@ -369,7 +438,7 @@ int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) return 1; } - p = strdup(cgroup); + p = strdupa(cgroup); if (!p) return -ENOMEM; @@ -377,8 +446,7 @@ int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) char *e; e = strrchr(p, '/'); - if (!e || e == p) { - free(p); + if (e == p || !e) { *bonding = NULL; return 0; } @@ -387,7 +455,6 @@ int cgroup_bonding_get(Manager *m, const char *cgroup, CGroupBonding **bonding) b = hashmap_get(m->cgroup_bondings, p); if (b) { - free(p); *bonding = b; return 1; } @@ -478,7 +545,8 @@ Unit* cgroup_unit_by_pid(Manager *m, pid_t pid) { CGroupBonding *cgroup_bonding_find_list(CGroupBonding *first, const char *controller) { CGroupBonding *b; - assert(controller); + if (!controller) + controller = SYSTEMD_CGROUP_CONTROLLER; LIST_FOREACH(by_unit, b, first) if (streq(b->controller, controller))