source: mainline/uspace/srv/bd/hr/raid0.c@ e192339

/*
 * 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 <abi/ipc/ipc.h>
#include <bd_srv.h>
#include <block.h>
#include <errno.h>
#include <hr.h>
#include <io/log.h>
#include <ipc/hr.h>
#include <ipc/services.h>
#include <loc.h>
#include <task.h>
#include <stdio.h>
#include <stdlib.h>
#include <str_error.h>

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

extern fibril_mutex_t big_lock;
extern loc_srv_t *hr_srv;

static errno_t hr_raid0_bd_open(bd_srvs_t *, bd_srv_t *);
static errno_t hr_raid0_bd_close(bd_srv_t *);
static errno_t hr_raid0_bd_read_blocks(bd_srv_t *, aoff64_t, size_t, void *,
    size_t);
static errno_t hr_raid0_bd_sync_cache(bd_srv_t *, aoff64_t, size_t);
static errno_t hr_raid0_bd_write_blocks(bd_srv_t *, aoff64_t, size_t,
    const void *, size_t);
static errno_t hr_raid0_bd_get_block_size(bd_srv_t *, size_t *);
static errno_t hr_raid0_bd_get_num_blocks(bd_srv_t *, aoff64_t *);

#define strip_size DATA_XFER_LIMIT

static bd_ops_t hr_raid0_bd_ops = {
        .open = hr_raid0_bd_open,
        .close = hr_raid0_bd_close,
        .sync_cache = hr_raid0_bd_sync_cache,
        .read_blocks = hr_raid0_bd_read_blocks,
        .write_blocks = hr_raid0_bd_write_blocks,
        .get_block_size = hr_raid0_bd_get_block_size,
        .get_num_blocks = hr_raid0_bd_get_num_blocks
};

static void raid0_geometry(uint64_t x, hr_volume_t *vol, size_t *extent,
    uint64_t *phys_block)
{
        uint64_t N = vol->dev_no; /* extents */
        uint64_t L = strip_size / vol->bsize; /* size of strip in blocks */

        uint64_t i = (x / L) % N; /* extent */
        uint64_t j = (x / L) / N; /* stripe */
        uint64_t k = x % L; /* strip offset */

        *extent = i;
        *phys_block = j * L + k;
}

static errno_t hr_raid0_bd_open(bd_srvs_t *bds, bd_srv_t *bd)
{
        log_msg(LOG_DEFAULT, LVL_NOTE, "hr_bd_open()");
        return EOK;
}

static errno_t hr_raid0_bd_close(bd_srv_t *bd)
{
        log_msg(LOG_DEFAULT, LVL_NOTE, "hr_bd_close()");
        return EOK;
}

static errno_t hr_raid0_bd_sync_cache(bd_srv_t *bd, aoff64_t ba, size_t cnt)
{
        hr_volume_t *vol = bd->srvs->sarg;
        errno_t rc;
        uint64_t phys_block;
        size_t extent;

        fibril_mutex_lock(&big_lock);

        size_t left = cnt;
        while (left != 0) {
                raid0_geometry(ba++, vol, &extent, &phys_block);
                rc = block_sync_cache(vol->devs[extent], phys_block, 1);
                if (rc != EOK)
                        break;
                left--;
        }

        fibril_mutex_unlock(&big_lock);
        return rc;
}

static errno_t hr_raid0_bd_read_blocks(bd_srv_t *bd, aoff64_t ba, size_t cnt,
    void *buf, size_t size)
{
        hr_volume_t *vol = bd->srvs->sarg;
        errno_t rc;
        uint64_t phys_block;
        size_t extent;

        if (size < cnt * vol->bsize)
                return EINVAL;

        fibril_mutex_lock(&big_lock);

        size_t left = cnt;
        while (left != 0) {
                raid0_geometry(ba++, vol, &extent, &phys_block);
                rc = block_read_direct(vol->devs[extent], phys_block, 1, buf);
                buf = buf + vol->bsize;
                if (rc != EOK)
                        break;
                left--;
        }

        fibril_mutex_unlock(&big_lock);
        return rc;
}

static errno_t hr_raid0_bd_write_blocks(bd_srv_t *bd, aoff64_t ba, size_t cnt,
    const void *data, size_t size)
{
        hr_volume_t *vol = bd->srvs->sarg;
        errno_t rc;
        uint64_t phys_block;
        size_t extent;

        if (size < cnt * vol->bsize)
                return EINVAL;

        fibril_mutex_lock(&big_lock);

        size_t left = cnt;
        while (left != 0) {
                raid0_geometry(ba++, vol, &extent, &phys_block);
                rc = block_write_direct(vol->devs[extent], phys_block, 1, data);
                data = data + vol->bsize;
                if (rc != EOK)
                        break;
                left--;
        }

        fibril_mutex_unlock(&big_lock);
        return rc;
}

static errno_t hr_raid0_bd_get_block_size(bd_srv_t *bd, size_t *rsize)
{
        hr_volume_t *vol = bd->srvs->sarg;

        *rsize = vol->bsize;
        return EOK;
}

static errno_t hr_raid0_bd_get_num_blocks(bd_srv_t *bd, aoff64_t *rnb)
{
        hr_volume_t *vol = bd->srvs->sarg;

        *rnb = vol->nblocks;
        return EOK;
}

errno_t hr_raid0_create(hr_volume_t *new_volume)
{
        assert(new_volume->level == hr_l_0);

        if (new_volume->dev_no < 2) {
                log_msg(LOG_DEFAULT, LVL_ERROR,
                    "RAID 0 array needs at least 2 devices");
                return EINVAL;
        }

        errno_t rc;
        size_t i, bsize, last_bsize;
        uint64_t nblocks, last_nblocks;
        uint64_t total_blocks = 0;

        rc = hr_init_devs(new_volume);
        if (rc != EOK)
                return rc;

        for (i = 0; i < new_volume->dev_no; i++) {
                rc = block_get_nblocks(new_volume->devs[i], &nblocks);
                if (rc != EOK)
                        goto error;
                if (i != 0 && nblocks != last_nblocks) {
                        log_msg(LOG_DEFAULT, LVL_ERROR,
                            "number of blocks differs");
                        rc = EINVAL;
                        goto error;
                }
                total_blocks += nblocks;
                last_nblocks = nblocks;
        }

        for (i = 0; i < new_volume->dev_no; i++) {
                rc = block_get_bsize(new_volume->devs[i], &bsize);
                if (rc != EOK)
                        goto error;
                if (i != 0 && bsize != last_bsize) {
                        log_msg(LOG_DEFAULT, LVL_ERROR, "block sizes differ");
                        rc = EINVAL;
                        goto error;
                }
                last_bsize = bsize;
        }

        bd_srvs_init(&new_volume->hr_bds);
        new_volume->hr_bds.ops = &hr_raid0_bd_ops;
        new_volume->hr_bds.sarg = new_volume;
        new_volume->nblocks = total_blocks;
        new_volume->bsize = bsize;

        rc = hr_register_volume(new_volume);
        if (rc != EOK)
                goto error;

        return EOK;
error:
        hr_fini_devs(new_volume);
        return rc;
}

/** @}
 */