staging/lustre/ldlm: Preparation to move /proc/fs/lustre/ldlm to sysfs

Add necessary infrastructure, register /sys/fs/lustre/ldlm,
/sys/fs/lustre/ldlm/namespaces and /sys/fs/lustre/ldlm/services
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/lustre_dlm.h

@@ -60,6 +60,9 @@
 struct obd_ops;
 struct obd_device;
 
+extern struct kset *ldlm_ns_kset;
+extern struct kset *ldlm_svc_kset;
+
 #define OBD_LDLM_DEVICENAME  "ldlm"
 
 #define LDLM_DEFAULT_LRU_SIZE (100 * num_online_cpus())
@@ -501,6 +504,9 @@ struct ldlm_namespace {
 	 * recalculation of LDLM pool statistics should be skipped.
 	 */
 	unsigned		ns_stopping:1;
+
+	struct kobject		ns_kobj; /* sysfs object */
+	struct completion	ns_kobj_unregister;
 };
 
 /**

drivers/staging/lustre/lustre/ldlm/ldlm_lockd.c

@@ -58,6 +58,10 @@ MODULE_PARM_DESC(ldlm_cpts, "CPU partitions ldlm threads should run on");
 static struct mutex	ldlm_ref_mutex;
 static int ldlm_refcount;
 
+struct kobject *ldlm_kobj;
+struct kset *ldlm_ns_kset;
+struct kset *ldlm_svc_kset;
+
 struct ldlm_cb_async_args {
 	struct ldlm_cb_set_arg *ca_set_arg;
 	struct ldlm_lock       *ca_lock;
@@ -1002,6 +1006,15 @@ void ldlm_destroy_export(struct obd_export *exp)
 }
 EXPORT_SYMBOL(ldlm_destroy_export);
 
+/* These are for root of /sys/fs/lustre/ldlm */
+struct attribute *ldlm_attrs[] = {
+	NULL,
+};
+
+static struct attribute_group ldlm_attr_group = {
+	.attrs = ldlm_attrs,
+};
+
 static int ldlm_setup(void)
 {
 	static struct ptlrpc_service_conf	conf;
@@ -1016,6 +1029,28 @@ static int ldlm_setup(void)
 	if (ldlm_state == NULL)
 		return -ENOMEM;
 
+	ldlm_kobj = kobject_create_and_add("ldlm", lustre_kobj);
+	if (!ldlm_kobj) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	rc = sysfs_create_group(ldlm_kobj, &ldlm_attr_group);
+	if (rc)
+		goto out;
+
+	ldlm_ns_kset = kset_create_and_add("namespaces", NULL, ldlm_kobj);
+	if (!ldlm_ns_kset) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	ldlm_svc_kset = kset_create_and_add("services", NULL, ldlm_kobj);
+	if (!ldlm_svc_kset) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
 	rc = ldlm_proc_setup();
 	if (rc != 0)
 		goto out;
@@ -1088,7 +1123,6 @@ static int ldlm_setup(void)
 			goto out;
 	}
 
-
 	rc = ldlm_pools_init();
 	if (rc) {
 		CERROR("Failed to initialize LDLM pools: %d\n", rc);
@@ -1135,6 +1169,13 @@ static int ldlm_cleanup(void)
 	if (ldlm_state->ldlm_cb_service != NULL)
 		ptlrpc_unregister_service(ldlm_state->ldlm_cb_service);
 
+	if (ldlm_ns_kset)
+		kset_unregister(ldlm_ns_kset);
+	if (ldlm_svc_kset)
+		kset_unregister(ldlm_svc_kset);
+	if (ldlm_kobj)
+		kobject_put(ldlm_kobj);
+
 	ldlm_proc_cleanup();
 
 

drivers/staging/lustre/lustre/ldlm/ldlm_resource.c

@@ -307,6 +307,24 @@ static ssize_t lprocfs_elc_seq_write(struct file *file,
 }
 LPROC_SEQ_FOPS(lprocfs_elc);
 
+/* These are for namespaces in /sys/fs/lustre/ldlm/namespaces/ */
+static struct attribute *ldlm_ns_attrs[] = {
+	NULL,
+};
+
+static void ldlm_ns_release(struct kobject *kobj)
+{
+	struct ldlm_namespace *ns = container_of(kobj, struct ldlm_namespace,
+						 ns_kobj);
+	complete(&ns->ns_kobj_unregister);
+}
+
+static struct kobj_type ldlm_ns_ktype = {
+	.default_attrs  = ldlm_ns_attrs,
+	.sysfs_ops      = &lustre_sysfs_ops,
+	.release        = ldlm_ns_release,
+};
+
 void ldlm_namespace_proc_unregister(struct ldlm_namespace *ns)
 {
 	if (ns->ns_proc_dir_entry == NULL)
@@ -319,6 +337,12 @@ void ldlm_namespace_proc_unregister(struct ldlm_namespace *ns)
 		lprocfs_free_stats(&ns->ns_stats);
 }
 
+void ldlm_namespace_sysfs_unregister(struct ldlm_namespace *ns)
+{
+	kobject_put(&ns->ns_kobj);
+	wait_for_completion(&ns->ns_kobj_unregister);
+}
+
 #define LDLM_NS_ADD_VAR(name, var, ops)				\
 	do {							\
 		snprintf(lock_name, MAX_STRING_SIZE, name);	\
@@ -327,6 +351,19 @@ void ldlm_namespace_proc_unregister(struct ldlm_namespace *ns)
 		lprocfs_add_vars(ns_pde, lock_vars, NULL);	\
 	} while (0)
 
+
+int ldlm_namespace_sysfs_register(struct ldlm_namespace *ns)
+{
+	int err;
+
+	ns->ns_kobj.kset = ldlm_ns_kset;
+	init_completion(&ns->ns_kobj_unregister);
+	err = kobject_init_and_add(&ns->ns_kobj, &ldlm_ns_ktype, NULL,
+				   "%s", ldlm_ns_name(ns));
+
+	return err;
+}
+
 int ldlm_namespace_proc_register(struct ldlm_namespace *ns)
 {
 	struct lprocfs_vars lock_vars[2];
@@ -636,10 +673,17 @@ struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
 	ns->ns_orig_connect_flags = 0;
 	ns->ns_connect_flags      = 0;
 	ns->ns_stopping	   = 0;
+
+	rc = ldlm_namespace_sysfs_register(ns);
+	if (rc != 0) {
+		CERROR("Can't initialize ns sysfs, rc %d\n", rc);
+		goto out_hash;
+	}
+
 	rc = ldlm_namespace_proc_register(ns);
 	if (rc != 0) {
 		CERROR("Can't initialize ns proc, rc %d\n", rc);
-		goto out_hash;
+		goto out_sysfs;
 	}
 
 	idx = ldlm_namespace_nr_read(client);
@@ -653,6 +697,8 @@ struct ldlm_namespace *ldlm_namespace_new(struct obd_device *obd, char *name,
 	return ns;
 out_proc:
 	ldlm_namespace_proc_unregister(ns);
+out_sysfs:
+	ldlm_namespace_sysfs_unregister(ns);
 	ldlm_namespace_cleanup(ns, 0);
 out_hash:
 	cfs_hash_putref(ns->ns_rs_hash);