1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/lu_ucred.c b/drivers/staging/lustre/lustre/obdclass/lu_ucred.c
new file mode 100644
index 000000000000..229db6c39b78
--- /dev/null
+++ b/drivers/staging/lustre/lustre/obdclass/lu_ucred.c
@@ -0,0 +1,107 @@
+/*
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see
+ * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/obdclass/lu_object.c
+ *
+ * Lustre Object.
+ * These are the only exported functions, they provide some generic
+ * infrastructure for managing object devices
+ *
+ *   Author: Nikita Danilov <nikita.danilov@sun.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_CLASS
+
+#include <linux/libcfs/libcfs.h>
+#include <obd_support.h>
+#include <lu_object.h>
+#include <md_object.h>
+
+/* context key constructor/destructor: lu_ucred_key_init, lu_ucred_key_fini */
+LU_KEY_INIT_FINI(lu_ucred, struct lu_ucred);
+
+static struct lu_context_key lu_ucred_key = {
+	.lct_tags = LCT_SESSION,
+	.lct_init = lu_ucred_key_init,
+	.lct_fini = lu_ucred_key_fini
+};
+
+/**
+ * Get ucred key if session exists and ucred key is allocated on it.
+ * Return NULL otherwise.
+ */
+struct lu_ucred *lu_ucred(const struct lu_env *env)
+{
+	if (!env->le_ses)
+		return NULL;
+	return lu_context_key_get(env->le_ses, &lu_ucred_key);
+}
+EXPORT_SYMBOL(lu_ucred);
+
+/**
+ * Get ucred key and check if it is properly initialized.
+ * Return NULL otherwise.
+ */
+struct lu_ucred *lu_ucred_check(const struct lu_env *env)
+{
+	struct lu_ucred *uc = lu_ucred(env);
+	if (uc && uc->uc_valid != UCRED_OLD && uc->uc_valid != UCRED_NEW)
+		return NULL;
+	return uc;
+}
+EXPORT_SYMBOL(lu_ucred_check);
+
+/**
+ * Get ucred key, which must exist and must be properly initialized.
+ * Assert otherwise.
+ */
+struct lu_ucred *lu_ucred_assert(const struct lu_env *env)
+{
+	struct lu_ucred *uc = lu_ucred_check(env);
+	LASSERT(uc != NULL);
+	return uc;
+}
+EXPORT_SYMBOL(lu_ucred_assert);
+
+int lu_ucred_global_init(void)
+{
+	LU_CONTEXT_KEY_INIT(&lu_ucred_key);
+	return lu_context_key_register(&lu_ucred_key);
+}
+
+void lu_ucred_global_fini(void)
+{
+	lu_context_key_degister(&lu_ucred_key);
+}