source: mainline/uspace/srv/bd/hr/superblock.c@ abc2c4b

/*
 * Copyright (c) 2024 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 <io/log.h>
#include <loc.h>
#include <mem.h>
#include <uuid.h>
#include <stdlib.h>
#include <stdio.h>
#include <str.h>
#include <types/uuid.h>

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

static errno_t read_metadata(service_id_t, hr_metadata_t *);

errno_t hr_write_meta_to_vol(hr_volume_t *vol)
{
        log_msg(LOG_DEFAULT, LVL_NOTE, "hr_write_meta_to_vol()");

        errno_t rc;
        size_t i;
        size_t meta_blkno; /* blocks needed to write metadata */
        hr_metadata_t *metadata;
        uuid_t uuid;

        metadata = calloc(1, HR_META_SIZE * vol->bsize);
        if (metadata == NULL)
                return ENOMEM;

        meta_blkno = (HR_META_OFF + HR_META_SIZE);
        if (vol->level != hr_l_1)
                meta_blkno *= vol->dev_no;

        if (vol->nblocks < meta_blkno) {
                log_msg(LOG_DEFAULT, LVL_ERROR,
                    "not enough blocks to write metadata");
                rc = EINVAL;
                goto error;
        } else if (vol->nblocks == meta_blkno) {
                log_msg(LOG_DEFAULT, LVL_ERROR,
                    "there would be zero data blocks after writing metadata, aborting");
                rc = EINVAL;
                goto error;
        }

        metadata->magic = host2uint64_t_le(HR_MAGIC);
        metadata->extent_no = host2uint32_t_le(vol->dev_no);
        metadata->level = host2uint32_t_le(vol->level);
        metadata->nblocks = host2uint64_t_le(vol->nblocks);
        metadata->data_blkno = host2uint64_t_le(vol->data_blkno);
        metadata->data_offset = host2uint32_t_le(vol->data_offset);
        metadata->strip_size = host2uint32_t_le(vol->strip_size);
        for (i = 0; i < vol->dev_no; i++) {
                metadata->index = host2uint32_t_le(i);

                rc = uuid_generate(&uuid);
                if (rc != EOK)
                        goto error;
                uuid_encode(&uuid, metadata->uuid);

                str_cpy(metadata->devname, HR_DEVNAME_LEN, vol->devname);

                rc = block_write_direct(vol->extents[i].svc_id, HR_META_OFF,
                    HR_META_SIZE, metadata);
                if (rc != EOK)
                        goto error;

                /* rndgen */
                fibril_usleep(1000);
        }
error:
        free(metadata);
        return rc;
}

errno_t hr_get_vol_from_meta(hr_config_t *cfg, hr_volume_t *new_volume)
{
        log_msg(LOG_DEFAULT, LVL_NOTE, "hr_get_vol_from_meta()");

        errno_t rc;
        hr_metadata_t *metadata;

        metadata = calloc(1, HR_META_SIZE * new_volume->bsize);
        if (metadata == NULL)
                return ENOMEM;

        /* for now assume metadata are in sync across extents */
        rc = read_metadata(cfg->devs[0], metadata);
        if (rc != EOK)
                goto end;

        /* TODO: sort new_volume->extents according to metadata extent index */

        if (uint64_t_le2host(metadata->magic) != HR_MAGIC) {
                printf("invalid magic\n");
                rc = EINVAL;
                goto end;
        }

        new_volume->level = uint32_t_le2host(metadata->level);
        new_volume->dev_no = uint32_t_le2host(metadata->extent_no);
        new_volume->nblocks = uint64_t_le2host(metadata->nblocks);
        new_volume->data_blkno = uint64_t_le2host(metadata->data_blkno);
        new_volume->data_offset = uint32_t_le2host(metadata->data_offset);
        new_volume->strip_size = uint32_t_le2host(metadata->strip_size);

        if (new_volume->dev_no != cfg->dev_no) {
                log_msg(LOG_DEFAULT, LVL_ERROR,
                    "number of divices in array differ: specified %zu, metadata states %zu",
                    cfg->dev_no, new_volume->dev_no);
                rc = EINVAL;
                goto end;
        }

        if (str_cmp(metadata->devname, new_volume->devname) != 0) {
                log_msg(LOG_DEFAULT, LVL_NOTE,
                    "devname on metadata (%s) and config (%s) differ, using config",
                    metadata->devname, new_volume->devname);
        }
end:
        free(metadata);
        return rc;
}

static errno_t read_metadata(service_id_t dev, hr_metadata_t *metadata)
{
        errno_t rc;
        size_t bsize;
        uint64_t nblocks;

        rc = block_get_bsize(dev, &bsize);
        if (rc != EOK)
                return rc;

        rc = block_get_nblocks(dev, &nblocks);
        if (rc != EOK)
                return rc;

        if (nblocks < (HR_META_SIZE + HR_META_OFF) * bsize)
                return EINVAL;

        rc = block_read_direct(dev, HR_META_OFF, HR_META_SIZE, metadata);
        if (rc != EOK)
                return rc;

        return EOK;
}

/** @}
 */