/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 *
 *  Extention of lu_object.h for metadata objects
 *
 *  Copyright (C) 2006 Cluster File Systems, Inc.
 *
 *   This file is part of Lustre, http://www.lustre.org.
 *
 *   Lustre is free software; you can redistribute it and/or
 *   modify it under the terms of version 2 of the GNU General Public
 *   License as published by the Free Software Foundation.
 *
 *   Lustre 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 for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with Lustre; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifndef _LINUX_MD_OBJECT_H
#define _LINUX_MD_OBJECT_H

#include <linux/lu_object.h>

struct md_device;
struct md_device_operations;
struct md_object;

/*the context of the mdd ops*/
struct context {
        __u32           mode;
        int             flags;
};

struct md_device_operations {
        int (*mdo_root_get)(struct md_device *m, struct lu_fid *f);
        int (*mdo_statfs)(struct md_device *m, struct kstatfs *sfs);
        int (*mdo_mkdir)(struct md_object *obj, const char *name,
                         struct md_object *child);

        int (*mdo_rename)(struct md_object *spobj, struct md_object *tpobj,
                          struct md_object *sobj, const char *sname,
                          struct md_object *tobj, const char *tname,
                          struct context *uctxt);
        int (*mdo_link)(struct md_object *tobj, struct md_object *sobj,
                        const char *name, struct context *uctxt);
        int (*mdo_attr_get)(struct md_object *obj, void *buf, int buf_len,
                            const char *name, struct context *uctxt);
        int (*mdo_attr_set)(struct md_object *obj, void *buf, int buf_len,
                            const char *name, struct context *uctxt);
        int (*mdo_index_insert)(struct md_object *pobj, struct md_object *obj,
                                const char *name, struct context *uctxt);
        int (*mdo_index_delete)(struct md_object *pobj, struct md_object *obj,
                                const char *name, struct context *uctxt);
        int (*mdo_object_create)(struct md_object *pobj, struct md_object *child,
                                 struct context *uctxt);
};

struct md_device {
        struct lu_device             md_lu_dev;
        struct md_device_operations *md_ops;
};

struct md_object {
        struct lu_object mo_lu;
};

static inline int lu_device_is_md(struct lu_device *d)
{
        return d->ld_type->ldt_tags & LU_DEVICE_MD;
}

static inline struct md_device *lu2md_dev(struct lu_device *d)
{
        LASSERT(lu_device_is_md(d));
        return container_of(d, struct md_device, md_lu_dev);
}

static inline struct lu_device *md2lu_dev(struct md_device *d)
{
        return &d->md_lu_dev;
}

static inline struct md_object *lu2md(struct lu_object *o)
{
        LASSERT(lu_device_is_md(o->lo_dev));
        return container_of(o, struct md_object, mo_lu);
}

static inline struct md_device *md_device_get(struct md_object *o)
{
        LASSERT(lu_device_is_md(o->mo_lu.lo_dev));
        return container_of(o->mo_lu.lo_dev, struct md_device, md_lu_dev);
}

static inline int md_device_init(struct md_device *md, struct lu_device_type *t)
{
	return lu_device_init(&md->md_lu_dev, t);
}

static inline void md_device_fini(struct md_device *md)
{
	lu_device_fini(&md->md_lu_dev);
}
#endif /* _LINUX_MD_OBJECT_H */