X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbasic%2Fcgroup-util.c;h=32cf4298f2628438fc6f843d2300e98fbc3b0c95;hb=306d96a538d1c007e1f5a700ec7555ef76372306;hp=bcb022896816450bfe101370a6d735e62c235433;hpb=0f58036abf34e92313105839658420e95acfdd7e;p=elogind.git

diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index bcb022896..32cf4298f 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -600,7 +600,7 @@ static int join_path_unified(const char *path, const char *suffix, char **fs) {
 }
 
 int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
-        int r;
+        int unified, r;
 
         assert(fs);
 
@@ -629,7 +629,11 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
         if (!cg_controller_is_valid(controller))
                 return -EINVAL;
 
-        if (cg_all_unified())
+        unified = cg_all_unified();
+        if (unified < 0)
+                return unified;
+
+        if (unified > 0)
                 r = join_path_unified(path, suffix, fs);
         else
                 r = join_path_legacy(controller, path, suffix, fs);
@@ -641,6 +645,7 @@ int cg_get_path(const char *controller, const char *path, const char *suffix, ch
 }
 
 static int controller_is_accessible(const char *controller) {
+        int unified;
 
         assert(controller);
 
@@ -652,7 +657,10 @@ static int controller_is_accessible(const char *controller) {
         if (!cg_controller_is_valid(controller))
                 return -EINVAL;
 
-        if (cg_all_unified()) {
+        unified = cg_all_unified();
+        if (unified < 0)
+                return unified;
+        if (unified > 0) {
                 /* We don't support named hierarchies if we are using
                  * the unified hierarchy. */
 
@@ -850,7 +858,7 @@ int cg_set_task_access(
                 gid_t gid) {
 
         _cleanup_free_ char *fs = NULL, *procs = NULL;
-        int r;
+        int r, unified;
 
         assert(path);
 
@@ -868,7 +876,10 @@ int cg_set_task_access(
         if (r < 0)
                 return r;
 
-        if (cg_unified(controller))
+        unified = cg_unified(controller);
+        if (unified < 0)
+                return unified;
+        if (unified)
                 return 0;
 
         /* Compatibility, Always keep values for "tasks" in sync with
@@ -922,7 +933,7 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
         char line[LINE_MAX];
         const char *fs;
         size_t cs = 0;
-        bool unified;
+        int unified;
 
         assert(path);
         assert(pid >= 0);
@@ -934,7 +945,9 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
                 controller = SYSTEMD_CGROUP_CONTROLLER;
 
         unified = cg_unified(controller);
-        if (!unified)
+        if (unified < 0)
+                return unified;
+        if (unified == 0)
                 cs = strlen(controller);
 
         fs = procfs_file_alloca(pid, "cgroup");
@@ -999,11 +1012,14 @@ int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
 int cg_install_release_agent(const char *controller, const char *agent) {
         _cleanup_free_ char *fs = NULL, *contents = NULL;
         const char *sc;
-        int r;
+        int r, unified;
 
         assert(agent);
 
-        if (cg_unified(controller)) /* doesn't apply to unified hierarchy */
+        unified = cg_unified(controller);
+        if (unified < 0)
+                return unified;
+        if (unified) /* doesn't apply to unified hierarchy */
                 return -EOPNOTSUPP;
 
         r = cg_get_path(controller, NULL, "release_agent", &fs);
@@ -1049,9 +1065,12 @@ int cg_install_release_agent(const char *controller, const char *agent) {
 
 int cg_uninstall_release_agent(const char *controller) {
         _cleanup_free_ char *fs = NULL;
-        int r;
+        int r, unified;
 
-        if (cg_unified(controller)) /* Doesn't apply to unified hierarchy */
+        unified = cg_unified(controller);
+        if (unified < 0)
+                return unified;
+        if (unified) /* Doesn't apply to unified hierarchy */
                 return -EOPNOTSUPP;
 
         r = cg_get_path(controller, NULL, "notify_on_release", &fs);
@@ -1096,7 +1115,7 @@ int cg_is_empty(const char *controller, const char *path) {
 }
 
 int cg_is_empty_recursive(const char *controller, const char *path) {
-        int r;
+        int unified, r;
 
         assert(path);
 
@@ -1104,7 +1123,11 @@ int cg_is_empty_recursive(const char *controller, const char *path) {
         if (controller && (isempty(path) || path_equal(path, "/")))
                 return false;
 
-        if (cg_unified(controller)) {
+        unified = cg_unified(controller);
+        if (unified < 0)
+                return unified;
+
+        if (unified > 0) {
                 _cleanup_free_ char *t = NULL;
 
                 /* On the unified hierarchy we can check empty state
@@ -2016,7 +2039,7 @@ int cg_get_keyed_attribute(const char *controller, const char *path, const char
 
 int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path) {
         CGroupController c;
-        int r;
+        int r, unified;
 
         /* This one will create a cgroup in our private tree, but also
          * duplicate it in the trees specified in mask, and remove it
@@ -2028,7 +2051,10 @@ int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path
                 return r;
 
         /* If we are in the unified hierarchy, we are done now */
-        if (cg_all_unified())
+        unified = cg_all_unified();
+        if (unified < 0)
+                return unified;
+        if (unified > 0)
                 return 0;
 
         /* Otherwise, do the same in the other hierarchies */
@@ -2049,13 +2075,16 @@ int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path
 
 int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t path_callback, void *userdata) {
         CGroupController c;
-        int r;
+        int r, unified;
 
         r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, path, pid);
         if (r < 0)
                 return r;
 
-        if (cg_all_unified())
+        unified = cg_all_unified();
+        if (unified < 0)
+                return unified;
+        if (unified > 0)
                 return 0;
 
         for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
@@ -2096,7 +2125,7 @@ int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids,
 
 int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t to_callback, void *userdata) {
         CGroupController c;
-        int r = 0;
+        int r = 0, unified;
 
         if (!path_equal(from, to))  {
                 r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, from, SYSTEMD_CGROUP_CONTROLLER, to, CGROUP_REMOVE);
@@ -2104,7 +2133,10 @@ int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to
                         return r;
         }
 
-        if (cg_all_unified())
+        unified = cg_all_unified();
+        if (unified < 0)
+                return unified;
+        if (unified > 0)
                 return r;
 
         for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
@@ -2128,13 +2160,16 @@ int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to
 
 int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root) {
         CGroupController c;
-        int r;
+        int r, unified;
 
         r = cg_trim(SYSTEMD_CGROUP_CONTROLLER, path, delete_root);
         if (r < 0)
                 return r;
 
-        if (cg_all_unified())
+        unified = cg_all_unified();
+        if (unified < 0)
+                return unified;
+        if (unified > 0)
                 return r;
 
         for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
@@ -2152,13 +2187,16 @@ int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root)
 
 int cg_mask_supported(CGroupMask *ret) {
         CGroupMask mask = 0;
-        int r;
+        int r, unified;
 
         /* Determines the mask of supported cgroup controllers. Only
          * includes controllers we can make sense of and that are
          * actually accessible. */
 
-        if (cg_all_unified()) {
+        unified = cg_all_unified();
+        if (unified < 0)
+                return unified;
+        if (unified > 0) {
                 _cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL;
                 const char *c;
 
@@ -2318,9 +2356,13 @@ static int cg_update_unified(void) {
         return 0;
 }
 
-bool cg_unified(const char *controller) {
+int cg_unified(const char *controller) {
+
+        int r;
 
-        assert(cg_update_unified() >= 0);
+        r = cg_update_unified();
+        if (r < 0)
+                return r;
 
         if (streq_ptr(controller, SYSTEMD_CGROUP_CONTROLLER))
                 return unified_cache >= CGROUP_UNIFIED_SYSTEMD;
@@ -2328,29 +2370,30 @@ bool cg_unified(const char *controller) {
                 return unified_cache >= CGROUP_UNIFIED_ALL;
 }
 
-bool cg_all_unified(void) {
+int cg_all_unified(void) {
 
         return cg_unified(NULL);
 }
 
 #if 0 /// UNNEEDED by elogind
-int cg_unified_flush(void) {
+void cg_unified_flush(void) {
         unified_cache = CGROUP_UNIFIED_UNKNOWN;
-
-        return cg_update_unified();
 }
 
 int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
         _cleanup_free_ char *fs = NULL;
         CGroupController c;
-        int r;
+        int r, unified;
 
         assert(p);
 
         if (supported == 0)
                 return 0;
 
-        if (!cg_all_unified()) /* on the legacy hiearchy there's no joining of controllers defined */
+        unified = cg_all_unified();
+        if (unified < 0)
+                return unified;
+        if (!unified) /* on the legacy hiearchy there's no joining of controllers defined */
                 return 0;
 
         r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, p, "cgroup.subtree_control", &fs);
@@ -2382,13 +2425,14 @@ int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p) {
 
 bool cg_is_unified_wanted(void) {
         static thread_local int wanted = -1;
-        int r;
+        int r, unified;
         bool b;
 
         /* If the hierarchy is already mounted, then follow whatever
          * was chosen for it. */
-        if (cg_unified_flush() >= 0)
-                return cg_all_unified();
+        unified = cg_all_unified();
+        if (unified >= 0)
+                return unified;
 
         /* Otherwise, let's see what the kernel command line has to
          * say. Since checking that is expensive, let's cache the
@@ -2409,7 +2453,7 @@ bool cg_is_legacy_wanted(void) {
 
 bool cg_is_unified_systemd_controller_wanted(void) {
         static thread_local int wanted = -1;
-        int r;
+        int r, unified;
         bool b;
 
         /* If the unified hierarchy is requested in full, no need to
@@ -2419,8 +2463,9 @@ bool cg_is_unified_systemd_controller_wanted(void) {
 
         /* If the hierarchy is already mounted, then follow whatever
          * was chosen for it. */
-        if (cg_unified_flush() >= 0)
-                return cg_unified(SYSTEMD_CGROUP_CONTROLLER);
+        unified = cg_unified(SYSTEMD_CGROUP_CONTROLLER);
+        if (unified >= 0)
+                return unified;
 
         /* Otherwise, let's see what the kernel command line has to
          * say. Since checking that is expensive, let's cache the