Litmus core: per-plugin proc directories

Change the Litmus proc layout so that loaded plugins are visible in
/proc/litmus/plugins/loaded and add Litmus functions make_plugin_proc_dir()
and remove_plugin_proc_dir() to add per-plugin proc directories.

1 files changed, 16 insertions, 0 deletions

diff --git a/include/litmus/litmus.h b/include/litmus/litmus.h
index 5d20276e44f4..ccb6b137952b 100644
--- a/include/litmus/litmus.h
+++ b/include/litmus/litmus.h
@@ -9,6 +9,9 @@
 #include <linux/jiffies.h>
 #include <litmus/sched_trace.h>
 
+#include <litmus/sched_plugin.h>
+#include <linux/proc_fs.h>
+
 #ifdef CONFIG_RELEASE_MASTER
 extern atomic_t release_master_cpu;
 #endif
@@ -62,6 +65,19 @@ void exit_litmus(struct task_struct *dead_tsk);
 long litmus_admit_task(struct task_struct *tsk);
 void litmus_exit_task(struct task_struct *tsk);
 
+/*
+ * On success, returns 0 and sets the pointer to the location of the new
+ * proc dir entry, otherwise returns an error code and sets pde to NULL.
+ */
+long make_plugin_proc_dir(struct sched_plugin* plugin,
+                struct proc_dir_entry** pde);
+
+/*
+ * Plugins should deallocate all child proc directory entries before
+ * calling this, to avoid memory leaks.
+ */
+void remove_plugin_proc_dir(struct sched_plugin* plugin);
+
 #define is_realtime(t)          ((t)->policy == SCHED_LITMUS)
 #define rt_transition_pending(t) \
         ((t)->rt_param.transition_pending)