/* -*- 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(__u16 stripes)
{
        return sizeof(struct lov_stripe_md) + stripes*sizeof(struct lov_oinfo*);
}

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)
{
        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'
#define IOC_LOV_MIN_NR                 50
#define IOC_LOV_SET_OSC_ACTIVE         _IOWR('g', 50, long)
#define IOC_LOV_MAX_NR                 50

#define QOS_DEFAULT_THRESHOLD           10 /* MB */
#define QOS_DEFAULT_MAXAGE              5  /* Seconds */

#endif