1 files changed, 114 insertions, 0 deletions
diff --git a/src/spdk/module/bdev/raid/raid5.c b/src/spdk/module/bdev/raid/raid5.c
new file mode 100644
index 000000000..1e287c863
--- /dev/null
+++ b/src/spdk/module/bdev/raid/raid5.c
@@ -0,0 +1,114 @@
+/*-
+ *   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)