staging/lustre/obdclass: Prepare for procfs to sysfs migration

Add necessary plumbing to register obd types and instances
under /sys/fs/lustre

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/lprocfs_status.h

@@ -62,6 +62,7 @@ struct lprocfs_vars {
 
 struct lprocfs_static_vars {
 	struct lprocfs_vars *obd_vars;
+	struct attribute_group *sysfs_vars;
 };
 
 /* if we find more consumers this could be generalized */
@@ -605,7 +606,8 @@ extern void lprocfs_remove(struct proc_dir_entry **root);
 extern void lprocfs_remove_proc_entry(const char *name,
 				      struct proc_dir_entry *parent);
 
-extern int lprocfs_obd_setup(struct obd_device *obd, struct lprocfs_vars *list);
+extern int lprocfs_obd_setup(struct obd_device *obd, struct lprocfs_vars *list,
+			     struct attribute_group *attrs);
 extern int lprocfs_obd_cleanup(struct obd_device *obd);
 
 extern int ldebugfs_seq_create(struct dentry *parent,

drivers/staging/lustre/lustre/include/obd.h

@@ -249,6 +249,7 @@ struct obd_type {
 	int  typ_refcnt;
 	struct lu_device_type *typ_lu;
 	spinlock_t obd_type_lock;
+	struct kobject *typ_kobj;
 };
 
 struct brw_page {
@@ -936,6 +937,9 @@ struct obd_device {
 	struct lu_ref	  obd_reference;
 
 	int		       obd_conn_inprogress;
+
+	struct kobject		obd_kobj; /* sysfs object */
+	struct completion	obd_kobj_unregister;
 };
 
 #define OBD_LLOG_FL_SENDNOW     0x0001

drivers/staging/lustre/lustre/lmv/lmv_obd.c

@@ -1309,7 +1309,7 @@ int lmv_fid_alloc(struct obd_export *exp, struct lu_fid *fid,
 static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 {
 	struct lmv_obd	     *lmv = &obd->u.lmv;
-	struct lprocfs_static_vars  lvars;
+	struct lprocfs_static_vars  lvars = { NULL };
 	struct lmv_desc	    *desc;
 	int			 rc;
 
@@ -1343,7 +1343,7 @@ static int lmv_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 
 	lprocfs_lmv_init_vars(&lvars);
 
-	lprocfs_obd_setup(obd, lvars.obd_vars);
+	lprocfs_obd_setup(obd, lvars.obd_vars, lvars.sysfs_vars);
 #if defined (CONFIG_PROC_FS)
 	{
 		rc = lprocfs_seq_create(obd->obd_proc_entry, "target_obd",

drivers/staging/lustre/lustre/lov/lov_obd.c

@@ -821,7 +821,7 @@ int lov_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 		goto out;
 
 	lprocfs_lov_init_vars(&lvars);
-	lprocfs_obd_setup(obd, lvars.obd_vars);
+	lprocfs_obd_setup(obd, lvars.obd_vars, lvars.sysfs_vars);
 #if defined (CONFIG_PROC_FS)
 	{
 		int rc1;

drivers/staging/lustre/lustre/mdc/mdc_request.c

@@ -2447,7 +2447,7 @@ static int mdc_setup(struct obd_device *obd, struct lustre_cfg *cfg)
 	if (rc)
 		goto err_close_lock;
 	lprocfs_mdc_init_vars(&lvars);
-	lprocfs_obd_setup(obd, lvars.obd_vars);
+	lprocfs_obd_setup(obd, lvars.obd_vars, lvars.sysfs_vars);
 	sptlrpc_lprocfs_cliobd_attach(obd);
 	ptlrpc_lprocfs_register_obd(obd);
 

drivers/staging/lustre/lustre/mgc/mgc_request.c

@@ -722,7 +722,7 @@ static int mgc_cleanup(struct obd_device *obd)
 
 static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 {
-	struct lprocfs_static_vars lvars;
+	struct lprocfs_static_vars lvars = { NULL };
 	int rc;
 
 	ptlrpcd_addref();
@@ -738,7 +738,7 @@ static int mgc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 	}
 
 	lprocfs_mgc_init_vars(&lvars);
-	lprocfs_obd_setup(obd, lvars.obd_vars);
+	lprocfs_obd_setup(obd, lvars.obd_vars, lvars.sysfs_vars);
 	sptlrpc_lprocfs_cliobd_attach(obd);
 
 	if (atomic_inc_return(&mgc_count) == 1) {

drivers/staging/lustre/lustre/obdclass/genops.c

@@ -199,6 +199,12 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
 		goto failed;
 	}
 
+	type->typ_kobj = kobject_create_and_add(type->typ_name, lustre_kobj);
+	if (!type->typ_kobj) {
+		rc = -ENOMEM;
+		goto failed;
+	}
+
 	if (ldt != NULL) {
 		type->typ_lu = ldt;
 		rc = lu_device_type_init(ldt);
@@ -213,6 +219,8 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops,
 	return 0;
 
  failed:
+	if (type->typ_kobj)
+		kobject_put(type->typ_kobj);
 	kfree(type->typ_name);
 	kfree(type->typ_md_ops);
 	kfree(type->typ_dt_ops);
@@ -239,6 +247,9 @@ int class_unregister_type(const char *name)
 		return -EBUSY;
 	}
 
+	if (type->typ_kobj)
+		kobject_put(type->typ_kobj);
+
 	if (type->typ_procroot) {
 		lprocfs_remove(&type->typ_procroot);
 	}

drivers/staging/lustre/lustre/obdclass/lprocfs_status.c

@@ -994,7 +994,26 @@ int lprocfs_rd_connect_flags(struct seq_file *m, void *data)
 }
 EXPORT_SYMBOL(lprocfs_rd_connect_flags);
 
-int lprocfs_obd_setup(struct obd_device *obd, struct lprocfs_vars *list)
+static struct attribute *obd_def_attrs[] = {
+	NULL,
+};
+
+static void obd_sysfs_release(struct kobject *kobj)
+{
+	struct obd_device *obd = container_of(kobj, struct obd_device,
+					      obd_kobj);
+
+	complete(&obd->obd_kobj_unregister);
+}
+
+static struct kobj_type obd_ktype = {
+	.default_attrs	= obd_def_attrs,
+	.sysfs_ops	= &lustre_sysfs_ops,
+	.release	= obd_sysfs_release,
+};
+
+int lprocfs_obd_setup(struct obd_device *obd, struct lprocfs_vars *list,
+		      struct attribute_group *attrs)
 {
 	int rc = 0;
 
@@ -1002,15 +1021,32 @@ int lprocfs_obd_setup(struct obd_device *obd, struct lprocfs_vars *list)
 	LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 	LASSERT(obd->obd_type->typ_procroot != NULL);
 
+	init_completion(&obd->obd_kobj_unregister);
+	rc = kobject_init_and_add(&obd->obd_kobj, &obd_ktype,
+				  obd->obd_type->typ_kobj,
+				  "%s", obd->obd_name);
+	if (rc)
+		return rc;
+
+	if (attrs) {
+		rc = sysfs_create_group(&obd->obd_kobj, attrs);
+		if (rc) {
+			kobject_put(&obd->obd_kobj);
+			return rc;
+		}
+	}
+
 	obd->obd_proc_entry = lprocfs_register(obd->obd_name,
 					       obd->obd_type->typ_procroot,
 					       list, obd);
 	if (IS_ERR(obd->obd_proc_entry)) {
+		kobject_put(&obd->obd_kobj);
 		rc = PTR_ERR(obd->obd_proc_entry);
 		CERROR("error %d setting up lprocfs for %s\n",
 		       rc, obd->obd_name);
 		obd->obd_proc_entry = NULL;
 	}
+
 	return rc;
 }
 EXPORT_SYMBOL(lprocfs_obd_setup);
@@ -1028,6 +1064,8 @@ int lprocfs_obd_cleanup(struct obd_device *obd)
 		lprocfs_remove(&obd->obd_proc_entry);
 		obd->obd_proc_entry = NULL;
 	}
+	kobject_put(&obd->obd_kobj);
+	wait_for_completion(&obd->obd_kobj_unregister);
 	return 0;
 }
 EXPORT_SYMBOL(lprocfs_obd_cleanup);

drivers/staging/lustre/lustre/osc/osc_request.c

@@ -3184,7 +3184,7 @@ int osc_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
 
 	cli->cl_grant_shrink_interval = GRANT_SHRINK_INTERVAL;
 	lprocfs_osc_init_vars(&lvars);
-	if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0) {
+	if (lprocfs_obd_setup(obd, lvars.obd_vars, lvars.sysfs_vars) == 0) {
 		lproc_osc_attach_seqstat(obd);
 		sptlrpc_lprocfs_cliobd_attach(obd);
 		ptlrpc_lprocfs_register_obd(obd);