[PATCH RFC 1/2] cobalt/registry: Add a new virtual /proc file for dumping registry

[Florian Bezdeka via Xenomai]

Introducing /proc/xenomai/registry/dump which could be accessed by
something like "cat" to dump the current registry. Like the "usage"
file it is available when CONFIG_XENO_OPT_VFILE is enabled.

The main purpose of this file is providing some additional help when
trying to find resource leaks triggered by Xenomai based applications.

Signed-off-by: Florian Bezdeka <florian.bezd...@siemens.com>
---
 kernel/cobalt/registry.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/kernel/cobalt/registry.c b/kernel/cobalt/registry.c
index 816102f7a..8befa795c 100644
--- a/kernel/cobalt/registry.c
+++ b/kernel/cobalt/registry.c
@@ -80,6 +80,23 @@ static int usage_vfile_show(struct xnvfile_regular_iterator 
*it, void *data)
        return 0;
 }
 
+static int dump_vfile_show(struct xnvfile_regular_iterator *it, void *data)
+{
+       struct xnobject *elem;
+       struct hlist_node *next;
+       int n;
+
+       xnvfile_printf(it, "nr_object_entries: %d\n", nr_object_entries);
+       xnvfile_printf(it, "obj_idx[0]: \treserved\n");
+
+       for (n = 0; n < nr_object_entries; n++)
+               hlist_for_each_entry_safe(elem, next, &object_index[n], hlink)
+                       xnvfile_printf(it, "obj_idx[%d]:\tobj=%p, key=%s\n", n,
+                                      elem->objaddr, elem->key ?: "(anon)");
+
+       return 0;
+}
+
 static struct xnvfile_regular_ops usage_vfile_ops = {
        .show = usage_vfile_show,
 };
@@ -88,6 +105,14 @@ static struct xnvfile_regular usage_vfile = {
        .ops = &usage_vfile_ops,
 };
 
+static struct xnvfile_regular_ops dump_vfile_ops = {
+       .show = dump_vfile_show,
+};
+
+static struct xnvfile_regular dump_vfile = {
+       .ops = &dump_vfile_ops,
+};
+
 #endif /* CONFIG_XENO_OPT_VFILE */
 
 unsigned xnregistry_hash_size(void)
@@ -124,8 +149,16 @@ int xnregistry_init(void)
                return ret;
        }
 
+       ret = xnvfile_init_regular("dump", &dump_vfile, &registry_vfroot);
+       if (ret) {
+               xnvfile_destroy_regular(&usage_vfile);
+               xnvfile_destroy_dir(&registry_vfroot);
+               return ret;
+       }
+
        proc_virq = pipeline_create_inband_sirq(registry_proc_schedule);
        if (proc_virq < 0) {
+               xnvfile_destroy_regular(&dump_vfile);
                xnvfile_destroy_regular(&usage_vfile);
                xnvfile_destroy_dir(&registry_vfroot);
                return proc_virq;
@@ -149,6 +182,7 @@ int xnregistry_init(void)
 
        if (object_index == NULL) {
 #ifdef CONFIG_XENO_OPT_VFILE
+               xnvfile_destroy_regular(&dump_vfile);
                xnvfile_destroy_regular(&usage_vfile);
                xnvfile_destroy_dir(&registry_vfroot);
                pipeline_delete_inband_sirq(proc_virq);
@@ -199,6 +233,7 @@ void xnregistry_cleanup(void)
 #ifdef CONFIG_XENO_OPT_VFILE
        pipeline_delete_inband_sirq(proc_virq);
        flush_scheduled_work();
+       xnvfile_destroy_regular(&dump_vfile);
        xnvfile_destroy_regular(&usage_vfile);
        xnvfile_destroy_dir(&registry_vfroot);
 #endif /* CONFIG_XENO_OPT_VFILE */
-- 
2.30.2