/*
 * 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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * Implementation of cl_device, cl_req for OSC layer.
 *
 *   Author: Nikita Danilov <nikita.danilov@sun.com>
 */

#define DEBUG_SUBSYSTEM S_OSC

/* class_name2obd() */
#include "../include/obd_class.h"

#include "osc_cl_internal.h"

/** \addtogroup osc
 * @{
 */

struct kmem_cache *osc_lock_kmem;
struct kmem_cache *osc_object_kmem;
struct kmem_cache *osc_thread_kmem;
struct kmem_cache *osc_session_kmem;
struct kmem_cache *osc_req_kmem;
struct kmem_cache *osc_extent_kmem;
struct kmem_cache *osc_quota_kmem;

struct lu_kmem_descr osc_caches[] = {
        {
                .ckd_cache = &osc_lock_kmem,
                .ckd_name  = "osc_lock_kmem",
                .ckd_size  = sizeof(struct osc_lock)
        },
        {
                .ckd_cache = &osc_object_kmem,
                .ckd_name  = "osc_object_kmem",
                .ckd_size  = sizeof(struct osc_object)
        },
        {
                .ckd_cache = &osc_thread_kmem,
                .ckd_name  = "osc_thread_kmem",
                .ckd_size  = sizeof(struct osc_thread_info)
        },
        {
                .ckd_cache = &osc_session_kmem,
                .ckd_name  = "osc_session_kmem",
                .ckd_size  = sizeof(struct osc_session)
        },
        {
                .ckd_cache = &osc_req_kmem,
                .ckd_name  = "osc_req_kmem",
                .ckd_size  = sizeof(struct osc_req)
        },
        {
                .ckd_cache = &osc_extent_kmem,
                .ckd_name  = "osc_extent_kmem",
                .ckd_size  = sizeof(struct osc_extent)
        },
        {
                .ckd_cache = &osc_quota_kmem,
                .ckd_name  = "osc_quota_kmem",
                .ckd_size  = sizeof(struct osc_quota_info)
        },
        {
                .ckd_cache = NULL
        }
};

struct lock_class_key osc_ast_guard_class;

/*****************************************************************************
 *
 * Type conversions.
 *
 */

static struct lu_device *osc2lu_dev(struct osc_device *osc)
{
        return &osc->od_cl.cd_lu_dev;
}

/*****************************************************************************
 *
 * Osc device and device type functions.
 *
 */

static void *osc_key_init(const struct lu_context *ctx,
                         struct lu_context_key *key)
{
        struct osc_thread_info *info;

        OBD_SLAB_ALLOC_PTR_GFP(info, osc_thread_kmem, GFP_NOFS);
        if (info == NULL)
                info = ERR_PTR(-ENOMEM);
        return info;
}

static void osc_key_fini(const struct lu_context *ctx,
                         struct lu_context_key *key, void *data)
{
        struct osc_thread_info *info = data;

        OBD_SLAB_FREE_PTR(info, osc_thread_kmem);
}

struct lu_context_key osc_key = {
        .lct_tags = LCT_CL_THREAD,
        .lct_init = osc_key_init,
        .lct_fini = osc_key_fini
};

static void *osc_session_init(const struct lu_context *ctx,
                              struct lu_context_key *key)
{
        struct osc_session *info;

        OBD_SLAB_ALLOC_PTR_GFP(info, osc_session_kmem, GFP_NOFS);
        if (info == NULL)
                info = ERR_PTR(-ENOMEM);
        return info;
}

static void osc_session_fini(const struct lu_context *ctx,
                             struct lu_context_key *key, void *data)
{
        struct osc_session *info = data;

        OBD_SLAB_FREE_PTR(info, osc_session_kmem);
}

struct lu_context_key osc_session_key = {
        .lct_tags = LCT_SESSION,
        .lct_init = osc_session_init,
        .lct_fini = osc_session_fini
};

/* type constructor/destructor: osc_type_{init,fini,start,stop}(). */
LU_TYPE_INIT_FINI(osc, &osc_key, &osc_session_key);

static int osc_cl_process_config(const struct lu_env *env,
                                 struct lu_device *d, struct lustre_cfg *cfg)
{
        return osc_process_config_base(d->ld_obd, cfg);
}

static const struct lu_device_operations osc_lu_ops = {
        .ldo_object_alloc      = osc_object_alloc,
        .ldo_process_config    = osc_cl_process_config,
        .ldo_recovery_complete = NULL
};

static const struct cl_device_operations osc_cl_ops = {
        .cdo_req_init = osc_req_init
};

static int osc_device_init(const struct lu_env *env, struct lu_device *d,
                           const char *name, struct lu_device *next)
{
        return 0;
}

static struct lu_device *osc_device_fini(const struct lu_env *env,
                                         struct lu_device *d)
{
        return NULL;
}

static struct lu_device *osc_device_free(const struct lu_env *env,
                                         struct lu_device *d)
{
        struct osc_device *od = lu2osc_dev(d);

        cl_device_fini(lu2cl_dev(d));
        OBD_FREE_PTR(od);
        return NULL;
}

static struct lu_device *osc_device_alloc(const struct lu_env *env,
                                          struct lu_device_type *t,
                                          struct lustre_cfg *cfg)
{
        struct lu_device *d;
        struct osc_device *od;
        struct obd_device *obd;
        int rc;

        OBD_ALLOC_PTR(od);
        if (od == NULL)
                return ERR_PTR(-ENOMEM);

        cl_device_init(&od->od_cl, t);
        d = osc2lu_dev(od);
        d->ld_ops = &osc_lu_ops;
        od->od_cl.cd_ops = &osc_cl_ops;

        /* Setup OSC OBD */
        obd = class_name2obd(lustre_cfg_string(cfg, 0));
        LASSERT(obd != NULL);
        rc = osc_setup(obd, cfg);
        if (rc) {
                osc_device_free(env, d);
                return ERR_PTR(rc);
        }
        od->od_exp = obd->obd_self_export;
        return d;
}

static const struct lu_device_type_operations osc_device_type_ops = {
        .ldto_init = osc_type_init,
        .ldto_fini = osc_type_fini,

        .ldto_start = osc_type_start,
        .ldto_stop  = osc_type_stop,

        .ldto_device_alloc = osc_device_alloc,
        .ldto_device_free  = osc_device_free,

        .ldto_device_init    = osc_device_init,
        .ldto_device_fini    = osc_device_fini
};

struct lu_device_type osc_device_type = {
        .ldt_tags     = LU_DEVICE_CL,
        .ldt_name     = LUSTRE_OSC_NAME,
        .ldt_ops      = &osc_device_type_ops,
        .ldt_ctx_tags = LCT_CL_THREAD
};

/** @} osc */