This commit adds the function cgroupv2_subtree_control_recursive().
cgroupv2_subtree_control_recursive() creates a cgroup hierarchy with
the subtree_control enabled in each parent cgroup for the requested
cgroup controller.
Signed-off-by: Tom Hromatka <tom.hroma...@oracle.com>
---
src/api.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 60 insertions(+)
diff --git a/src/api.c b/src/api.c
index d16b79c8e8e1..666ce33b4527 100644
--- a/src/api.c
+++ b/src/api.c
@@ -1885,6 +1885,66 @@ out:
return error;
}
+/**
+ * Recursively enable/disable a controller in the cgv2 subtree_control file
+ *
+ * @param path Directory that contains the subtree_control file
+ * @param ctrl_name Name of the controller to be enabled/disabled
+ * @param enable Enable/Disable the given controller
+ */
+STATIC int cgroupv2_subtree_control_recursive(char *path,
+ const char *ctrl_name,
+ bool enable)
+{
+ char *path_copy, *tmp_path, *stok_buff = NULL;
+ bool found_mount = false;
+ size_t mount_len;
+ int i, error = 0;
+
+ for (i = 0; cg_mount_table[i].name[0] != '\0'; i++) {
+ if (strncmp(cg_mount_table[i].name, ctrl_name,
+ sizeof(cg_mount_table[i].name)) == 0) {
+ found_mount = true;
+ break;
+ }
+ }
+
+ if (!found_mount)
+ return ECGROUPSUBSYSNOTMOUNTED;
+
+ path_copy = strdup(path);
+ if (!path_copy)
+ return ECGOTHER;
+
+ /* Null terminate the path_copy to match the string length of the
+ * controller mount. We'll incrementally build up the string,
+ * subdir by subdir, and enable the subtree control file each step
+ * of the way
+ */
+ mount_len = strlen(cg_mount_table[i].mount.path);
+ path_copy[mount_len] = '\0';
+
+ tmp_path = strtok_r(&path[mount_len], "/", &stok_buff);
+ do {
+ if (tmp_path) {
+ strcat(path_copy, "/");
+ strcat(path_copy, tmp_path);
+ }
+
+ error = cg_create_control_group(path_copy);
+ if (error)
+ goto out;
+
+ error = cgroupv2_subtree_control(path_copy, ctrl_name, enable);
+ if (error)
+ goto out;
+ } while ((tmp_path = strtok_r(NULL, "/", &stok_buff)));
+
+out:
+ free(path_copy);
+ return error;
+}
+
/** cgroup_modify_cgroup modifies the cgroup control files.
* struct cgroup *cgroup: The name will be the cgroup to be modified.
* The values will be the values to be modified, those not mentioned
--
2.25.3
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