1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/block/zram/backend_lzo.c b/drivers/block/zram/backend_lzo.c
new file mode 100644
index 000000000000..4c906beaae6b
--- /dev/null
+++ b/drivers/block/zram/backend_lzo.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/lzo.h>
+
+#include "backend_lzo.h"
+
+static void lzo_release_params(struct zcomp_params *params)
+{
+}
+
+static int lzo_setup_params(struct zcomp_params *params)
+{
+	return 0;
+}
+
+static int lzo_create(struct zcomp_params *params, struct zcomp_ctx *ctx)
+{
+	ctx->context = kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
+	if (!ctx->context)
+		return -ENOMEM;
+	return 0;
+}
+
+static void lzo_destroy(struct zcomp_ctx *ctx)
+{
+	kfree(ctx->context);
+}
+
+static int lzo_compress(struct zcomp_params *params, struct zcomp_ctx *ctx,
+			struct zcomp_req *req)
+{
+	int ret;
+
+	ret = lzo1x_1_compress(req->src, req->src_len, req->dst,
+			       &req->dst_len, ctx->context);
+	return ret == LZO_E_OK ? 0 : ret;
+}
+
+static int lzo_decompress(struct zcomp_params *params, struct zcomp_ctx *ctx,
+			  struct zcomp_req *req)
+{
+	int ret;
+
+	ret = lzo1x_decompress_safe(req->src, req->src_len,
+				    req->dst, &req->dst_len);
+	return ret == LZO_E_OK ? 0 : ret;
+}
+
+const struct zcomp_ops backend_lzo = {
+	.compress	= lzo_compress,
+	.decompress	= lzo_decompress,
+	.create_ctx	= lzo_create,
+	.destroy_ctx	= lzo_destroy,
+	.setup_params	= lzo_setup_params,
+	.release_params	= lzo_release_params,
+	.name		= "lzo",
+};