md_service.c

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/*
 * Copyright (c) 2012-2020 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.
 *
 */


#define M0_TRACE_SUBSYSTEM M0_TRACE_SUBSYS_MDS
#include "lib/trace.h"

#include "lib/errno.h"
#include "lib/memory.h"
#include "lib/locality.h"
#include "motr/magic.h"
#include "motr/setup.h"
#include "reqh/reqh_service.h"
#include "reqh/reqh.h"
#include "layout/layout.h"
#include "layout/linear_enum.h"
#include "layout/pdclust.h"
#include "conf/confc.h"
#include "conf/helpers.h"
#include "mdservice/md_fops.h"
#include "mdservice/md_service.h"
#include "mdservice/fsync_fops.h"
#include "module/instance.h"    /* m0_get */


static int mds_allocate(struct m0_reqh_service **service,
                        const struct m0_reqh_service_type *stype);
static void mds_fini(struct m0_reqh_service *service);

static int mds_start(struct m0_reqh_service *service);
static void mds_stop(struct m0_reqh_service *service);

static const struct m0_reqh_service_type_ops mds_type_ops = {
        .rsto_service_allocate = mds_allocate
};

static const struct m0_reqh_service_ops mds_ops = {
        .rso_start       = mds_start,
        .rso_start_async = m0_reqh_service_async_start_simple,
        .rso_stop        = mds_stop,
        .rso_fini        = mds_fini
};

struct m0_reqh_service_type m0_mds_type = {
        .rst_name     = "M0_CST_MDS",
        .rst_ops      = &mds_type_ops,
        .rst_level    = M0_MD_SVC_LEVEL,
        .rst_typecode = M0_CST_MDS,
};

M0_INTERNAL int m0_mds_register(void)
{
        int rc;

        m0_get()->i_mds_cdom_key = m0_reqh_lockers_allot();

        /* XXX: find better place */
        m0_get()->i_actrec_dom_key = m0_reqh_lockers_allot();
        m0_get()->i_dtm0_log_key = m0_reqh_lockers_allot();

        m0_reqh_service_type_register(&m0_mds_type);

        rc = m0_mdservice_fsync_fop_init(&m0_mds_type);
        if (rc != 0) {
                return M0_ERR_INFO(rc,
                                   "Unable to initialize mdservice fsync fop");
        }
        rc = m0_mdservice_fop_init();
        if (rc != 0) {
                m0_mdservice_fsync_fop_fini();
                return M0_ERR_INFO(rc, "Unable to initialize mdservice fop");
        }
        return M0_RC(rc);
}

M0_INTERNAL void m0_mds_unregister(void)
{
        m0_reqh_service_type_unregister(&m0_mds_type);
        m0_mdservice_fop_fini();
        m0_mdservice_fsync_fop_fini();

        m0_reqh_lockers_free(m0_get()->i_mds_cdom_key);

        /* XXX: find better place */
        m0_reqh_lockers_free(m0_get()->i_actrec_dom_key);
        m0_reqh_lockers_free(m0_get()->i_dtm0_log_key);
}

static int mds_allocate(struct m0_reqh_service **service,
                        const struct m0_reqh_service_type *stype)
{
        struct m0_reqh_md_service *mds;

        M0_PRE(service != NULL && stype != NULL);

        M0_ALLOC_PTR(mds);
        if (mds == NULL)
                return M0_ERR(-ENOMEM);

        mds->rmds_magic = M0_MDS_REQH_SVC_MAGIC;

        *service = &mds->rmds_gen;
        (*service)->rs_ops = &mds_ops;
        return 0;
}

static void mds_fini(struct m0_reqh_service *service)
{
        struct m0_reqh_md_service *serv_obj;

        M0_PRE(service != NULL);

        serv_obj = container_of(service, struct m0_reqh_md_service, rmds_gen);
        m0_free(serv_obj);
}

static int mds_start(struct m0_reqh_service *service)
{
        struct m0_motr            *cctx;
        /*struct m0_reqh            *reqh;*/
        struct m0_reqh_md_service *mds;
        /*struct m0_sm_group        *grp;*/

        M0_PRE(service != NULL);

        mds = container_of(service, struct m0_reqh_md_service, rmds_gen);

        /* in UT we don't init layouts */
        if (mds->rmds_gen.rs_reqh_ctx == NULL)
                return 0;

        cctx = mds->rmds_gen.rs_reqh_ctx->rc_motr;
        if (cctx->cc_ha_addr == NULL)
                return 0;
        /*reqh = mds->rmds_gen.rs_reqh;*/
        /* grp  = &reqh->rh_sm_grp; - no, reqh is not started yet */
        /*grp  = m0_locality0_get()->lo_grp;*/
        return 0;
}

static void mds_stop(struct m0_reqh_service *service)
{
        m0_reqh_lockers_clear(service->rs_reqh, m0_get()->i_mds_cdom_key);

        /* XXX: find better place */
        m0_reqh_lockers_clear(service->rs_reqh, m0_get()->i_actrec_dom_key);
        m0_reqh_lockers_clear(service->rs_reqh, m0_get()->i_dtm0_log_key);
}

#undef M0_TRACE_SUBSYSTEM

#undef M0_TRACE_SUBSYSTEM
/*
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 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 80
 *  scroll-step: 1
 *  End:
 */