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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* 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.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT
* OWNER OR CONTRIBUTORS 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.
*/
#include "bdev_raid.h"
#include "spdk/env.h"
#include "spdk/thread.h"
#include "spdk/string.h"
#include "spdk/util.h"
#include "spdk_internal/log.h"
struct raid5_info {
/* The parent raid bdev */
struct raid_bdev *raid_bdev;
/* Number of data blocks in a stripe (without parity) */
uint64_t stripe_blocks;
/* Number of stripes on this array */
uint64_t total_stripes;
};
static inline uint8_t
raid5_stripe_data_chunks_num(const struct raid_bdev *raid_bdev)
{
return raid_bdev->num_base_bdevs - raid_bdev->module->base_bdevs_max_degraded;
}
static void
raid5_submit_rw_request(struct raid_bdev_io *raid_io)
{
raid_bdev_io_complete(raid_io, SPDK_BDEV_IO_STATUS_FAILED);
}
static int
raid5_start(struct raid_bdev *raid_bdev)
{
uint64_t min_blockcnt = UINT64_MAX;
struct raid_base_bdev_info *base_info;
struct raid5_info *r5info;
r5info = calloc(1, sizeof(*r5info));
if (!r5info) {
SPDK_ERRLOG("Failed to allocate r5info\n");
return -ENOMEM;
}
r5info->raid_bdev = raid_bdev;
RAID_FOR_EACH_BASE_BDEV(raid_bdev, base_info) {
min_blockcnt = spdk_min(min_blockcnt, base_info->bdev->blockcnt);
}
r5info->total_stripes = min_blockcnt / raid_bdev->strip_size;
r5info->stripe_blocks = raid_bdev->strip_size * raid5_stripe_data_chunks_num(raid_bdev);
raid_bdev->bdev.blockcnt = r5info->stripe_blocks * r5info->total_stripes;
raid_bdev->bdev.optimal_io_boundary = r5info->stripe_blocks;
raid_bdev->bdev.split_on_optimal_io_boundary = true;
raid_bdev->module_private = r5info;
return 0;
}
static void
raid5_stop(struct raid_bdev *raid_bdev)
{
struct raid5_info *r5info = raid_bdev->module_private;
free(r5info);
}
static struct raid_bdev_module g_raid5_module = {
.level = RAID5,
.base_bdevs_min = 3,
.base_bdevs_max_degraded = 1,
.start = raid5_start,
.stop = raid5_stop,
.submit_rw_request = raid5_submit_rw_request,
};
RAID_MODULE_REGISTER(&g_raid5_module)
SPDK_LOG_REGISTER_COMPONENT("bdev_raid5", SPDK_LOG_BDEV_RAID5)
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