fom_interpose.h

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/* -*- C -*- */
/*
 * Copyright (c) 2013-2020 Seagate Technology LLC and/or its Affiliates
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * For any questions about this software or licensing,
 * please email opensource@seagate.com or cortx-questions@seagate.com.
 *
 */


#pragma once

#ifndef __MOTR_FOP_FOM_INTERPOSE_H__
#define __MOTR_FOP_FOM_INTERPOSE_H__

#include "fop/fom.h"

struct m0_fom_interpose_ops;

struct m0_fom_interpose {
        struct m0_fom_ops                  fi_shim;
        const struct m0_fom_ops           *fi_orig;
        const struct m0_fom_interpose_ops *fi_ops;
};

struct m0_fom_interpose_ops {
        int (*io_pre [64])(struct m0_fom *fom, struct m0_fom_interpose *proxy);
        int (*io_post[64])(struct m0_fom *fom, struct m0_fom_interpose *proxy,
                           int result);
};

struct m0_fom_thralldom {
        struct m0_fom           *ft_leader;
        struct m0_fom_interpose  ft_fief;
        void                   (*ft_end)(struct m0_fom_thralldom *thrall,
                                         struct m0_fom           *serf);
};

M0_INTERNAL void m0_fom_interpose_enter(struct m0_fom           *fom,
                                        struct m0_fom_interpose *proxy);

M0_INTERNAL void m0_fom_interpose_leave(struct m0_fom           *fom,
                                        struct m0_fom_interpose *proxy);


M0_INTERNAL void m0_fom_enthrall(struct m0_fom *leader, struct m0_fom *serf,
                                 struct m0_fom_thralldom *thrall,
                                 void (*end)(struct m0_fom_thralldom *thrall,
                                             struct m0_fom           *serf));

#endif /* __MOTR_FOP_FOM_INTERPOSE_H__ */

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