drive.c

Go to the documentation of this file.

/*
 * Copyright (c) 2014-2020 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_CONF
#include "lib/trace.h"

#include "conf/objs/common.h"
#include "conf/onwire_xc.h"  /* m0_confx_drive_xc */
#include "motr/magic.h"      /* M0_CONF_DRIVE_MAGIC */

#define XCAST(xobj) ((struct m0_confx_drive *)(&(xobj)->xo_u))
M0_BASSERT(offsetof(struct m0_confx_drive, xk_header) == 0);

static bool drive_check(const void *bob)
{
        const struct m0_conf_drive *self = bob;

        M0_PRE(m0_conf_obj_type(&self->ck_obj) == &M0_CONF_DRIVE_TYPE);

        return true;
}

M0_CONF__BOB_DEFINE(m0_conf_drive, M0_CONF_DRIVE_MAGIC, drive_check);
M0_CONF__INVARIANT_DEFINE(drive_invariant, m0_conf_drive);

static int
drive_decode(struct m0_conf_obj *dest, const struct m0_confx_obj *src)
{
        struct m0_conf_drive  *d = M0_CONF_CAST(dest, m0_conf_drive);
        struct m0_confx_drive *s = XCAST(src);
        struct m0_conf_obj    *child;
        int                    rc;

        rc = m0_conf_obj_find(dest->co_cache, &s->xk_sdev, &child);
        if (rc == 0) {
                d->ck_sdev = M0_CONF_CAST(child, m0_conf_sdev);
                /* back pointer to drive objects */
                d->ck_sdev->sd_drive = dest->co_id;
        }
        return M0_RC(conf_pvers_decode(&d->ck_pvers, &s->xk_pvers,
                                       dest->co_cache));

}

static int
drive_encode(struct m0_confx_obj *dest, const struct m0_conf_obj *src)
{
        struct m0_conf_drive  *s = M0_CONF_CAST(src, m0_conf_drive);
        struct m0_confx_drive *d = XCAST(dest);

        confx_encode(dest, src);
        if (s->ck_sdev != NULL)
                XCAST(dest)->xk_sdev = s->ck_sdev->sd_obj.co_id;
        return M0_RC(conf_pvers_encode(&d->xk_pvers,
                          (const struct m0_conf_pver**)s->ck_pvers));
}

static bool
drive_match(const struct m0_conf_obj *cached, const struct m0_confx_obj *flat)
{
        const struct m0_confx_drive *xobj = XCAST(flat);
        const struct m0_conf_sdev  *child =
                M0_CONF_CAST(cached, m0_conf_drive)->ck_sdev;

        return m0_fid_eq(&child->sd_obj.co_id, &xobj->xk_sdev);
}

static void drive_delete(struct m0_conf_obj *obj)
{
        struct m0_conf_drive *x = M0_CONF_CAST(obj, m0_conf_drive);

        m0_conf_drive_bob_fini(x);
        m0_free(x->ck_pvers);
        m0_free(x);
}

static const struct m0_conf_obj_ops drive_ops = {
        .coo_invariant = drive_invariant,
        .coo_decode    = drive_decode,
        .coo_encode    = drive_encode,
        .coo_match     = drive_match,
        .coo_lookup    = conf_obj_lookup_denied,
        .coo_readdir   = NULL,
        .coo_downlinks = conf_obj_downlinks_none,
        .coo_delete    = drive_delete
};

M0_CONF__CTOR_DEFINE(drive_create, m0_conf_drive, &drive_ops);

const struct m0_conf_obj_type M0_CONF_DRIVE_TYPE = {
        .cot_ftype = {
                .ft_id   = M0_CONF__DRIVE_FT_ID,
                .ft_name = "conf_drive"
        },
        .cot_create  = &drive_create,
        .cot_xt      = &m0_confx_drive_xc,
        .cot_branch  = "u_drive",
        .cot_xc_init = &m0_xc_m0_confx_drive_struct_init,
        .cot_magic   = M0_CONF_DRIVE_MAGIC
};

#undef XCAST
#undef M0_TRACE_SUBSYSTEM

/*
 *  Local variables:
 *  c-indentation-style: "K&R"
 *  c-basic-offset: 8
 *  tab-width: 8
 *  fill-column: 80
 *  scroll-step: 1
 *  End:
 */
/*
 * vim: tabstop=8 shiftwidth=8 noexpandtab textwidth=80 nowrap
 */