/* -*- 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
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/*
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * Implementation of cl_object for LOVSUB layer.
 *
 *   Author: Nikita Danilov <nikita.danilov@sun.com>
 */

#define DEBUG_SUBSYSTEM S_LOV

#include "lov_cl_internal.h"

/** \addtogroup lov
 *  @{
 */

/*****************************************************************************
 *
 * Lovsub object operations.
 *
 */

int lovsub_object_init(const struct lu_env *env, struct lu_object *obj,
                       const struct lu_object_conf *conf)
{
        struct lovsub_device  *dev   = lu2lovsub_dev(obj->lo_dev);
        struct lu_object      *below;
        struct lu_device      *under;

        int result;

        ENTRY;
        under = &dev->acid_next->cd_lu_dev;
        below = under->ld_ops->ldo_object_alloc(env, obj->lo_header, under);
        if (below != NULL) {
                lu_object_add(obj, below);
                result = 0;
        } else
                result = -ENOMEM;
        RETURN(result);

}

static void lovsub_object_free(const struct lu_env *env, struct lu_object *obj)
{
        struct lovsub_object *los = lu2lovsub(obj);
        struct lov_object    *lov = los->lso_super;
        ENTRY;

        /* We can't assume lov was assigned here, because of the shadow
         * object handling in lu_object_find.
         */
        if (lov) {
                LASSERT(lov->lo_type == LLT_RAID0);
                LASSERT(lov->u.raid0.lo_sub[los->lso_index] == los);
                cfs_spin_lock(&lov->u.raid0.lo_sub_lock);
                lov->u.raid0.lo_sub[los->lso_index] = NULL;
                cfs_spin_unlock(&lov->u.raid0.lo_sub_lock);
        }

        lu_object_fini(obj);
        lu_object_header_fini(&los->lso_header.coh_lu);
        OBD_SLAB_FREE_PTR(los, lovsub_object_kmem);
        EXIT;
}

static int lovsub_object_print(const struct lu_env *env, void *cookie,
                               lu_printer_t p, const struct lu_object *obj)
{
        struct lovsub_object *los = lu2lovsub(obj);

        return (*p)(env, cookie, "[%i]", los->lso_index);
}

static int lovsub_attr_set(const struct lu_env *env, struct cl_object *obj,
                           const struct cl_attr *attr, unsigned valid)
{
        struct lov_object *lov = cl2lovsub(obj)->lso_super;

        ENTRY;
        lov_r0(lov)->lo_attr_valid = 0;
        RETURN(0);
}

static int lovsub_object_glimpse(const struct lu_env *env,
                                 const struct cl_object *obj,
                                 struct ost_lvb *lvb)
{
        struct lovsub_object *los = cl2lovsub(obj);

        ENTRY;
        RETURN(cl_object_glimpse(env, &los->lso_super->lo_cl, lvb));
}



static const struct cl_object_operations lovsub_ops = {
        .coo_page_init = lovsub_page_init,
        .coo_lock_init = lovsub_lock_init,
        .coo_attr_set  = lovsub_attr_set,
        .coo_glimpse   = lovsub_object_glimpse
};

static const struct lu_object_operations lovsub_lu_obj_ops = {
        .loo_object_init      = lovsub_object_init,
        .loo_object_delete    = NULL,
        .loo_object_release   = NULL,
        .loo_object_free      = lovsub_object_free,
        .loo_object_print     = lovsub_object_print,
        .loo_object_invariant = NULL
};

struct lu_object *lovsub_object_alloc(const struct lu_env *env,
                                      const struct lu_object_header *unused,
                                      struct lu_device *dev)
{
        struct lovsub_object *los;
        struct lu_object     *obj;

        ENTRY;
        OBD_SLAB_ALLOC_PTR_GFP(los, lovsub_object_kmem, CFS_ALLOC_IO);
        if (los != NULL) {
                struct cl_object_header *hdr;

                obj = lovsub2lu(los);
                hdr = &los->lso_header;
                cl_object_header_init(hdr);
                lu_object_init(obj, &hdr->coh_lu, dev);
                lu_object_add_top(&hdr->coh_lu, obj);
                los->lso_cl.co_ops = &lovsub_ops;
                obj->lo_ops = &lovsub_lu_obj_ops;
        } else
                obj = NULL;
        RETURN(obj);
}

/** @} lov */