fop_item_type.c

Go to the documentation of this file.

/* -*- 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.
 *
 */


#include "lib/errno.h"
#include "lib/memory.h"
#include "fop/fop.h"
#include "fop/fop_item_type.h"
#include "rpc/rpc_helpers.h"   /* m0_rpc_item_header2_encdec */

#define M0_TRACE_SUBSYSTEM M0_TRACE_SUBSYS_FOP
#include "lib/trace.h"

M0_INTERNAL m0_bcount_t m0_fop_payload_size(const struct m0_rpc_item *item)
{
        struct m0_fop       *fop;
        struct m0_xcode_ctx  ctx;

        M0_PRE(item != NULL);

        fop = m0_rpc_item_to_fop(item);
        M0_ASSERT(fop != NULL);
        M0_ASSERT(fop->f_type != NULL);

        return m0_xcode_data_size(&ctx, &M0_FOP_XCODE_OBJ(fop));
}

M0_INTERNAL int
m0_fop_item_type_default_encode(const struct m0_rpc_item_type *item_type,
                                struct m0_rpc_item *item,
                                struct m0_bufvec_cursor *cur)
{
        M0_PRE(item != NULL);
        M0_PRE(cur != NULL);

        return m0_fop_item_encdec(item, cur, M0_XCODE_ENCODE);
}

M0_INTERNAL int
m0_fop_item_type_default_decode(const struct m0_rpc_item_type *item_type,
                                struct m0_rpc_item **item_out,
                                struct m0_bufvec_cursor *cur)
{
        int                      rc;
        struct m0_fop           *fop;
        struct m0_fop_type      *ftype;
        struct m0_rpc_item      *item;

        M0_PRE(item_out != NULL);
        M0_PRE(cur != NULL);

        *item_out = NULL;
        ftype = m0_item_type_to_fop_type(item_type);
        M0_ASSERT(ftype != NULL);

        /*
         * Decoding in xcode is different from sunrpc xdr where top object is
         * allocated by caller; in xcode, even the top object is allocated,
         * so we don't need to allocate the fop->f_data->fd_data.
         */
        M0_ALLOC_PTR(fop);
        if (fop == NULL)
                return M0_ERR(-ENOMEM);

        m0_fop_init(fop, ftype, NULL, m0_fop_release);
        item = m0_fop_to_rpc_item(fop);
        rc = m0_fop_item_encdec(item, cur, M0_XCODE_DECODE);
        *item_out = item;

        return M0_RC(rc);
}

M0_INTERNAL int m0_fop_item_encdec(struct m0_rpc_item *item,
                                   struct m0_bufvec_cursor *cur,
                                   enum m0_xcode_what what)
{
        M0_PRE(item != NULL);
        M0_PRE(cur != NULL);

        /* Currently MAX slot references in sessions is 1. */
        return m0_rpc_item_header2_encdec(&item->ri_header, cur, what) ?:
                m0_fop_encdec(m0_rpc_item_to_fop(item), cur, what);
}

void m0_fop_item_get(struct m0_rpc_item *item)
{
        m0_fop_get(m0_rpc_item_to_fop(item));
}

void m0_fop_item_put(struct m0_rpc_item *item)
{
        m0_fop_put(m0_rpc_item_to_fop(item));
}

const struct m0_rpc_item_type_ops m0_fop_default_item_type_ops = {
        M0_FOP_DEFAULT_ITEM_TYPE_OPS,
};
M0_EXPORTED(m0_fop_default_item_type_ops);

#undef M0_TRACE_SUBSYSTEM

/*
 *  Local variables:
 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 79
 *  scroll-step: 1
 *  End:
 */