source: mainline/uspace/srv/bd/hr/superblock.c@ 78433bb

/*
 * Copyright (c) 2025 Miroslav Cimerman
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup hr
 * @{
 */
/**
 * @file
 */

#include <block.h>
#include <byteorder.h>
#include <errno.h>
#include <inttypes.h>
#include <io/log.h>
#include <loc.h>
#include <mem.h>
#include <uuid.h>
#include <stdlib.h>
#include <stdio.h>
#include <str.h>

#include "superblock.h"
#include "util.h"
#include "var.h"

#include "metadata/native.h"

#include "metadata/foreign/geom/g_mirror.h"
#include "metadata/foreign/geom/g_stripe.h"
#include "metadata/foreign/softraid/softraidvar.h"

extern hr_superblock_ops_t metadata_native_ops;
extern hr_superblock_ops_t metadata_gmirror_ops;
extern hr_superblock_ops_t metadata_gstripe_ops;
extern hr_superblock_ops_t metadata_softraid_ops;

static hr_superblock_ops_t *hr_superblock_ops_all[] = {
        [HR_METADATA_NATIVE] = &metadata_native_ops,
        [HR_METADATA_GEOM_MIRROR] = &metadata_gmirror_ops,
        [HR_METADATA_GEOM_STRIPE] = &metadata_gstripe_ops,
        [HR_METADATA_SOFTRAID] = &metadata_softraid_ops
};

hr_superblock_ops_t *get_type_ops(hr_metadata_type_t type)
{
        assert(type >= HR_METADATA_NATIVE && type < HR_METADATA_LAST_DUMMY);

        return hr_superblock_ops_all[type];
}

errno_t find_metadata(service_id_t svc_id, void **rmetadata,
    hr_metadata_type_t *rtype)
{
        HR_DEBUG("%s()", __func__);

        errno_t rc;
        hr_superblock_ops_t *meta_ops;
        void *meta_block;
        void *metadata_struct;

        if (rmetadata == NULL)
                return EINVAL;
        if (rtype == NULL)
                return EINVAL;

        volatile hr_metadata_type_t type = HR_METADATA_NATIVE;
        for (; type < HR_METADATA_LAST_DUMMY; type++) {
                meta_ops = hr_superblock_ops_all[type];

                metadata_struct = meta_ops->alloc_struct();
                if (metadata_struct == NULL)
                        return ENOMEM;

                rc = meta_ops->get_block(svc_id, &meta_block);
                if (rc == ENOMEM) {
                        free(metadata_struct);
                        return ENOMEM;
                } else if (rc != EOK) {
                        free(metadata_struct);
                        continue;
                }

                rc = meta_ops->decode(meta_block, metadata_struct);

                free(meta_block);

                if (rc != EOK) {
                        free(metadata_struct);
                        continue;
                }

                if (!meta_ops->has_valid_magic(metadata_struct)) {
                        free(metadata_struct);
                        continue;
                }

                *rmetadata = metadata_struct;
                *rtype = type;
                return EOK;
        }

        return ENOFS;
}

/** @}
 */