X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fbasic%2Fcgroup-util.c;h=9dd93d00b0a9d88e780e668c32bcc2b622627862;hp=fce0b9e5df7ebf632d0f23663d8354bf16ff7e7e;hb=d77d27f4ca2945f88343fbe72ed0bf1236ad2aa6;hpb=3c4743e938878986b5fd89119d1d050658b8024e

diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index fce0b9e5d..9dd93d00b 100644
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -889,7 +889,6 @@ int cg_set_task_access(
 
         return 0;
 }
-#endif // 0
 
 int cg_set_xattr(const char *controller, const char *path, const char *name, const void *value, size_t size, int flags) {
         _cleanup_free_ char *fs = NULL;
@@ -927,6 +926,7 @@ int cg_get_xattr(const char *controller, const char *path, const char *name, voi
 
         return (int) n;
 }
+#endif // 0
 
 int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
         _cleanup_fclose_ FILE *f = NULL;
@@ -2331,6 +2331,8 @@ static int cg_update_unified(void) {
 
 #if 0 /// UNNEEDED by elogind
         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)) {
 #else
         /* elogind can not support the unified hierarchy as a controller,
          * so always assume a classical hierarchy.
@@ -2339,8 +2341,6 @@ static int cg_update_unified(void) {
          * add such a support. */
         if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
 #endif // 0
-                unified_cache = CGROUP_UNIFIED_ALL;
-        else if (F_TYPE_EQUAL(fs.f_type, TMPFS_MAGIC)) {
                 if (statfs("/sys/fs/cgroup/systemd/", &fs) < 0)
                         return -errno;
 
@@ -2454,9 +2454,6 @@ bool cg_is_unified_wanted(void) {
 bool cg_is_legacy_wanted(void) {
         return !cg_is_unified_wanted();
 }
-#else
-bool cg_is_legacy_wanted(void) {
-        return true;
 
 bool cg_is_unified_systemd_controller_wanted(void) {
         static thread_local int wanted = -1;
@@ -2503,6 +2500,10 @@ bool cg_is_unified_systemd_controller_wanted(void) {
 bool cg_is_legacy_systemd_controller_wanted(void) {
         return cg_is_legacy_wanted() && !cg_is_unified_systemd_controller_wanted();
 }
+#else
+bool cg_is_legacy_wanted(void) {
+        return true;
+}
 #endif // 0
 
 #if 0 /// UNNEEDED by elogind
@@ -2583,6 +2584,20 @@ int cg_blkio_weight_parse(const char *s, uint64_t *ret) {
 }
 #endif // 0
 
+bool is_cgroup_fs(const struct statfs *s) {
+        return is_fs_type(s, CGROUP_SUPER_MAGIC) ||
+               is_fs_type(s, CGROUP2_SUPER_MAGIC);
+}
+
+bool fd_is_cgroup_fs(int fd) {
+        struct statfs s;
+
+        if (fstatfs(fd, &s) < 0)
+                return -errno;
+
+        return is_cgroup_fs(&s);
+}
+
 static const char *cgroup_controller_table[_CGROUP_CONTROLLER_MAX] = {
         [CGROUP_CONTROLLER_CPU] = "cpu",
         [CGROUP_CONTROLLER_CPUACCT] = "cpuacct",