LU-709 build: cleanup VFS_KERN_MOUNT/INVALIDATEPAGE_RETURN_INT

[fs/lustre-release.git] / lustre / include / obd_lov.h

diff --git a/lustre/include/obd_lov.h b/lustre/include/obd_lov.h
index c0f302d..859beb5 100644 (file)
--- a/lustre/include/obd_lov.h
+++ b/lustre/include/obd_lov.h
@@ -1,20 +1,87 @@
 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
  * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * 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) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Whamcloud, Inc.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
  */
 
 #ifndef _OBD_LOV_H__
 #define _OBD_LOV_H__
 
-static inline int lov_stripe_md_size(int stripes)
+static inline int lov_stripe_md_size(__u16 stripes)
 {
         return sizeof(struct lov_stripe_md) + stripes*sizeof(struct lov_oinfo*);
 }
 
-#define lov_mds_md_size(stripes) lov_mds_md_v1_size(stripes)
-static inline int lov_mds_md_v1_size(int stripes)
+static inline __u32 lov_mds_md_size(__u16 stripes, __u32 lmm_magic)
+{
+        if (lmm_magic == LOV_MAGIC_V3)
+                return sizeof(struct lov_mds_md_v3) +
+                        stripes * sizeof(struct lov_ost_data_v1);
+        else
+                return sizeof(struct lov_mds_md_v1) +
+                        stripes * sizeof(struct lov_ost_data_v1);
+}
+
+struct lov_version_size {
+        __u32   lvs_magic;
+        size_t  lvs_lmm_size;
+        size_t  lvs_lod_size;
+};
+
+static inline __u32 lov_mds_md_stripecnt(int ea_size, __u32 lmm_magic)
 {
-        return sizeof(struct lov_mds_md_v1) +
-                stripes * sizeof(struct lov_ost_data_v1);
+        static const struct lov_version_size lmm_ver_size[] = {
+                        { .lvs_magic = LOV_MAGIC_V3,
+                          .lvs_lmm_size = sizeof(struct lov_mds_md_v3),
+                          .lvs_lod_size = sizeof(struct lov_ost_data_v1) },
+                        { .lvs_magic = LOV_MAGIC_V1,
+                          .lvs_lmm_size = sizeof(struct lov_mds_md_v1),
+                          .lvs_lod_size = sizeof(struct lov_ost_data_v1)} };
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(lmm_ver_size); i++) {
+                if (lmm_magic == lmm_ver_size[i].lvs_magic) {
+                        if (ea_size <= lmm_ver_size[i].lvs_lmm_size)
+                                return 0;
+                        return (ea_size - lmm_ver_size[i].lvs_lmm_size) /
+                                lmm_ver_size[i].lvs_lod_size;
+                }
+        }
+
+        /* Invalid LOV magic, so no stripes could fit */
+        return 0;
 }
 
 #define IOC_LOV_TYPE                   'g'