source: mainline/uspace/srv/bd/hr/raid4.c@ 4dd650a

/*
 * 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 <mem.h>
#include <task.h>
#include <stdio.h>
#include <stdlib.h>
#include <str_error.h>

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

extern loc_srv_t *hr_srv;

static errno_t hr_raid4_bd_open(bd_srvs_t *, bd_srv_t *);
static errno_t hr_raid4_bd_close(bd_srv_t *);
static errno_t hr_raid4_bd_read_blocks(bd_srv_t *, aoff64_t, size_t, void *,
    size_t);
static errno_t hr_raid4_bd_sync_cache(bd_srv_t *, aoff64_t, size_t);
static errno_t hr_raid4_bd_write_blocks(bd_srv_t *, aoff64_t, size_t,
    const void *, size_t);
static errno_t hr_raid4_bd_get_block_size(bd_srv_t *, size_t *);
static errno_t hr_raid4_bd_get_num_blocks(bd_srv_t *, aoff64_t *);

static bd_ops_t hr_raid4_bd_ops = {
        .open = hr_raid4_bd_open,
        .close = hr_raid4_bd_close,
        .sync_cache = hr_raid4_bd_sync_cache,
        .read_blocks = hr_raid4_bd_read_blocks,
        .write_blocks = hr_raid4_bd_write_blocks,
        .get_block_size = hr_raid4_bd_get_block_size,
        .get_num_blocks = hr_raid4_bd_get_num_blocks
};

static void xor(void *dst, const void *src, size_t size)
{
        size_t i;
        uint64_t *d = dst;
        const uint64_t *s = src;

        for (i = 0; i < size / sizeof(uint64_t); ++i)
                *d++ ^= *s++;
}

static errno_t write_parity(hr_volume_t *vol, uint64_t extent, uint64_t block,
    const void *data, size_t cnt)
{
        errno_t rc;
        size_t i, j;
        void *xorbuf;
        void *buf;

        xorbuf = malloc(vol->bsize);
        if (xorbuf == NULL)
                return ENOMEM;

        buf = malloc(vol->bsize);
        if (buf == NULL) {
                free(xorbuf);
                return ENOMEM;
        }

        for (j = 0; j < cnt; j++) {
                memset(xorbuf, 0, vol->bsize);
                for (i = 1; i < vol->dev_no; i++) {
                        if (i == extent) {
                                xor(xorbuf, data, vol->bsize);
                        } else {
                                rc = block_read_direct(vol->extents[i].svc_id,
                                    block, 1, buf);
                                if (rc != EOK)
                                        goto end;
                                xor(xorbuf, buf, vol->bsize);
                        }
                }
                rc = block_write_direct(vol->extents[0].svc_id, block, 1,
                    xorbuf);
                if (rc != EOK)
                        goto end;
                data = (void *) ((uintptr_t) data + vol->bsize);
                block++;
        }
end:
        free(xorbuf);
        free(buf);
        return rc;
}

static errno_t hr_raid4_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_raid4_bd_close(bd_srv_t *bd)
{
        log_msg(LOG_DEFAULT, LVL_NOTE, "hr_bd_close()");
        return EOK;
}

static errno_t hr_raid4_bd_op(hr_bd_op_type_t type, bd_srv_t *bd, aoff64_t ba,
    size_t cnt, void *data_read, const void *data_write, size_t size)
{
        hr_volume_t *vol = bd->srvs->sarg;
        errno_t rc;
        uint64_t phys_block;
        size_t left;

        if (type == HR_BD_READ || type == HR_BD_WRITE)
                if (size < cnt * vol->bsize)
                        return EINVAL;

        rc = hr_check_ba_range(vol, cnt, ba);
        if (rc != EOK)
                return rc;

        uint64_t strip_size = vol->strip_size / vol->bsize; /* in blocks */
        uint64_t stripe = (ba / strip_size); /* stripe number */
        uint64_t extent = (stripe % (vol->dev_no - 1)) + 1;
        uint64_t ext_stripe = stripe / (vol->dev_no - 1); /* stripe level */
        uint64_t strip_off = ba % strip_size; /* strip offset */

        fibril_mutex_lock(&vol->lock);

        left = cnt;
        while (left != 0) {
                phys_block = ext_stripe * strip_size + strip_off;
                cnt = min(left, strip_size - strip_off);
                hr_add_ba_offset(vol, &phys_block);
                switch (type) {
                case HR_BD_SYNC:
                        rc = block_sync_cache(vol->extents[extent].svc_id,
                            phys_block, cnt);
                        break;
                case HR_BD_READ:
                        rc = block_read_direct(vol->extents[extent].svc_id,
                            phys_block, cnt, data_read);
                        data_read = (void *) ((uintptr_t) data_read +
                            (vol->bsize * cnt));
                        break;
                case HR_BD_WRITE:
                        rc = block_write_direct(vol->extents[extent].svc_id,
                            phys_block, cnt, data_write);
                        if (rc != EOK)
                                goto error;
                        rc = write_parity(vol, extent, phys_block, data_write,
                            cnt);
                        if (rc != EOK)
                                goto error;
                        data_write = (void *) ((uintptr_t) data_write +
                            (vol->bsize * cnt));
                        break;
                default:
                        rc = EINVAL;
                }

                if (rc != EOK)
                        goto error;

                left -= cnt;
                strip_off = 0;
                extent++;
                if (extent >= vol->dev_no) {
                        ext_stripe++;
                        extent = 1;
                }
        }

error:
        fibril_mutex_unlock(&vol->lock);
        return rc;
}

static errno_t hr_raid4_bd_sync_cache(bd_srv_t *bd, aoff64_t ba, size_t cnt)
{
        return hr_raid4_bd_op(HR_BD_SYNC, bd, ba, cnt, NULL, NULL, 0);
}

static errno_t hr_raid4_bd_read_blocks(bd_srv_t *bd, aoff64_t ba, size_t cnt,
    void *buf, size_t size)
{
        return hr_raid4_bd_op(HR_BD_READ, bd, ba, cnt, buf, NULL, size);
}

static errno_t hr_raid4_bd_write_blocks(bd_srv_t *bd, aoff64_t ba, size_t cnt,
    const void *data, size_t size)
{
        return hr_raid4_bd_op(HR_BD_WRITE, bd, ba, cnt, NULL, data, size);
}

static errno_t hr_raid4_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_raid4_bd_get_num_blocks(bd_srv_t *bd, aoff64_t *rnb)
{
        hr_volume_t *vol = bd->srvs->sarg;

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

errno_t hr_raid4_create(hr_volume_t *new_volume)
{
        errno_t rc;

        assert(new_volume->level == HR_LVL_4);

        if (new_volume->dev_no < 3) {
                log_msg(LOG_DEFAULT, LVL_ERROR,
                    "RAID 4 array needs at least 3 devices");
                return EINVAL;
        }

        bd_srvs_init(&new_volume->hr_bds);
        new_volume->hr_bds.ops = &hr_raid4_bd_ops;
        new_volume->hr_bds.sarg = new_volume;

        rc = hr_register_volume(new_volume);

        return rc;
}

errno_t hr_raid4_init(hr_volume_t *vol)
{
        errno_t rc;
        size_t bsize;
        uint64_t total_blkno;

        assert(vol->level == HR_LVL_4);

        rc = hr_check_devs(vol, &total_blkno, &bsize);
        if (rc != EOK)
                return rc;

        vol->nblocks = total_blkno;
        vol->bsize = bsize;
        vol->data_offset = HR_DATA_OFF;
        vol->data_blkno = vol->nblocks - (vol->data_offset * vol->dev_no) -
            (vol->nblocks / vol->dev_no);
        vol->strip_size = HR_STRIP_SIZE;

        return EOK;
}

/** @}
 */