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core: simplify cg_[all_]unified()
[elogind.git] / src / basic / cgroup-util.c
diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 323720caef49797a6cd33c5f103f4f8a488846c5..bcb022896816450bfe101370a6d735e62c235433 100644 (file)
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -210,12 +210,6 @@ int cg_rmdir(const char *controller, const char *path) {
         if (r < 0 && errno != ENOENT)
                 return -errno;
 
-        if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
-                r = cg_rmdir(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path);
-                if (r < 0)
-                        log_warning_errno(r, "Failed to remove compat systemd cgroup %s: %m", path);
-        }
-
         return 0;
 }
 
@@ -554,13 +548,6 @@ static const char *controller_to_dirname(const char *controller) {
          * just cuts off the name= prefixed used for named
          * hierarchies, if it is specified. */
 
-        if (streq(controller, SYSTEMD_CGROUP_CONTROLLER)) {
-                if (cg_hybrid_unified())
-                        controller = SYSTEMD_CGROUP_CONTROLLER_HYBRID;
-                else
-                        controller = SYSTEMD_CGROUP_CONTROLLER_LEGACY;
-        }
-
         e = startswith(controller, "name=");
         if (e)
                 return e;
@@ -719,7 +706,7 @@ static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct
 
 int cg_trim(const char *controller, const char *path, bool delete_root) {
         _cleanup_free_ char *fs = NULL;
-        int r = 0, q;
+        int r = 0;
 
         assert(path);
 
@@ -742,12 +729,6 @@ int cg_trim(const char *controller, const char *path, bool delete_root) {
                         return -errno;
         }
 
-        if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
-                q = cg_trim(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, delete_root);
-                if (q < 0)
-                        log_warning_errno(q, "Failed to trim compat systemd cgroup %s: %m", path);
-        }
-
         return r;
 }
 
@@ -771,12 +752,6 @@ int cg_create(const char *controller, const char *path) {
                 return -errno;
         }
 
-        if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
-                r = cg_create(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path);
-                if (r < 0)
-                        log_warning_errno(r, "Failed to create compat systemd cgroup %s: %m", path);
-        }
-
         return 1;
 }
 
@@ -814,17 +789,7 @@ int cg_attach(const char *controller, const char *path, pid_t pid) {
 
         xsprintf(c, PID_FMT "\n", pid);
 
-        r = write_string_file(fs, c, 0);
-        if (r < 0)
-                return r;
-
-        if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
-                r = cg_attach(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, pid);
-                if (r < 0)
-                        log_warning_errno(r, "Failed to attach %d to compat systemd cgroup %s: %m", pid, path);
-        }
-
-        return 0;
+        return write_string_file(fs, c, 0);
 }
 
 int cg_attach_fallback(const char *controller, const char *path, pid_t pid) {
@@ -874,17 +839,7 @@ int cg_set_group_access(
         if (r < 0)
                 return r;
 
-        r = chmod_and_chown(fs, mode, uid, gid);
-        if (r < 0)
-                return r;
-
-        if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
-                r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, mode, uid, gid);
-                if (r < 0)
-                        log_warning_errno(r, "Failed to set group access on compat systemd cgroup %s: %m", path);
-        }
-
-        return 0;
+        return chmod_and_chown(fs, mode, uid, gid);
 }
 
 int cg_set_task_access(
@@ -913,18 +868,13 @@ int cg_set_task_access(
         if (r < 0)
                 return r;
 
-        if (!cg_unified(controller)) {
-                /* Compatibility, Always keep values for "tasks" in sync with
-                 * "cgroup.procs" */
-                if (cg_get_path(controller, path, "tasks", &procs) >= 0)
-                        (void) chmod_and_chown(procs, mode, uid, gid);
-        }
+        if (cg_unified(controller))
+                return 0;
 
-        if (streq(controller, SYSTEMD_CGROUP_CONTROLLER) && cg_hybrid_unified()) {
-                r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER_LEGACY, path, mode, uid, gid);
-                if (r < 0)
-                        log_warning_errno(r, "Failed to set task access on compat systemd cgroup %s: %m", path);
-        }
+        /* Compatibility, Always keep values for "tasks" in sync with
+         * "cgroup.procs" */
+        if (cg_get_path(controller, path, "tasks", &procs) >= 0)
+                (void) chmod_and_chown(procs, mode, uid, gid);
 
         return 0;
 }
@@ -970,7 +920,7 @@ int cg_get_xattr(const char *controller, const char *path, const char *name, voi
 int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
         _cleanup_fclose_ FILE *f = NULL;
         char line[LINE_MAX];
-        const char *fs, *controller_str;
+        const char *fs;
         size_t cs = 0;
         bool unified;
 
@@ -984,14 +934,8 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
                 controller = SYSTEMD_CGROUP_CONTROLLER;
 
         unified = cg_unified(controller);
-        if (!unified) {
-                if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
-                        controller_str = SYSTEMD_CGROUP_CONTROLLER_LEGACY;
-                else
-                        controller_str = controller;
-
-                cs = strlen(controller_str);
-        }
+        if (!unified)
+                cs = strlen(controller);
 
         fs = procfs_file_alloca(pid, "cgroup");
         log_debug_elogind("Searching for PID %u in \"%s\" (controller \"%s\")",
@@ -1030,7 +974,7 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
 
                         *e = 0;
                         FOREACH_WORD_SEPARATOR(word, k, l, ",", state) {
-                                if (k == cs && memcmp(word, controller_str, cs) == 0) {
+                                if (k == cs && memcmp(word, controller, cs) == 0) {
                                         found = true;
                                         break;
                                 }
@@ -1916,9 +1860,6 @@ bool cg_controller_is_valid(const char *p) {
         if (!p)
                 return false;
 
-        if (streq(p, SYSTEMD_CGROUP_CONTROLLER))
-                return true;
-
         s = startswith(p, "name=");
         if (s)
                 p = s;
@@ -2358,16 +2299,11 @@ static int cg_update_unified(void) {
         if (F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
                 unified_cache = CGROUP_UNIFIED_ALL;
         else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
-                if (statfs("/sys/fs/cgroup/unified/", &fs) == 0 &&
-                    F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC))
-                        unified_cache = CGROUP_UNIFIED_SYSTEMD;
-                else {
-                        if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
-                                return -errno;
-                        if (!F_TYPE_EQUAL(fs.f_type, CGROUP_SUPER_MAGIC))
-                                return -ENOMEDIUM;
-                        unified_cache = CGROUP_UNIFIED_NONE;
-                }
+                if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
+                        return -errno;
+
+                unified_cache = F_TYPE_EQUAL(fs.f_type, CGROUP2_SUPER_MAGIC) ?
+                        CGROUP_UNIFIED_SYSTEMD : CGROUP_UNIFIED_NONE;
         } else
                 return -ENOMEDIUM;
 #else
@@ -2398,13 +2334,6 @@ bool cg_all_unified(void) {
 }
 
 #if 0 /// UNNEEDED by elogind
-bool cg_hybrid_unified(void) {
-
-        assert(cg_update_unified() >= 0);
-
-        return unified_cache == CGROUP_UNIFIED_SYSTEMD;
-}
-
 int cg_unified_flush(void) {
         unified_cache = CGROUP_UNIFIED_UNKNOWN;
 
@@ -2509,6 +2438,11 @@ bool cg_is_legacy_wanted(void) {
         /* The meaning of the kernel option is reversed wrt. to the return value
          * of this function, hence the negation. */
         return (wanted = r > 0 ? !b : false);
+        return (wanted = r > 0 ? b : false);
+}
+
+bool cg_is_legacy_systemd_controller_wanted(void) {
+        return cg_is_legacy_wanted() && !cg_is_unified_systemd_controller_wanted();
 }
 #endif // 0
 
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