Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / block / zram / zcomp_lz4.c

diff --git a/kernel/drivers/block/zram/zcomp_lz4.c b/kernel/drivers/block/zram/zcomp_lz4.c
new file mode 100644 (file)
index 0000000..f2afb7e
--- /dev/null
+++ b/kernel/drivers/block/zram/zcomp_lz4.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2014 Sergey Senozhatsky.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/lz4.h>
+
+#include "zcomp_lz4.h"
+
+static void *zcomp_lz4_create(void)
+{
+       return kzalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
+}
+
+static void zcomp_lz4_destroy(void *private)
+{
+       kfree(private);
+}
+
+static int zcomp_lz4_compress(const unsigned char *src, unsigned char *dst,
+               size_t *dst_len, void *private)
+{
+       /* return  : Success if return 0 */
+       return lz4_compress(src, PAGE_SIZE, dst, dst_len, private);
+}
+
+static int zcomp_lz4_decompress(const unsigned char *src, size_t src_len,
+               unsigned char *dst)
+{
+       size_t dst_len = PAGE_SIZE;
+       /* return  : Success if return 0 */
+       return lz4_decompress_unknownoutputsize(src, src_len, dst, &dst_len);
+}
+
+struct zcomp_backend zcomp_lz4 = {
+       .compress = zcomp_lz4_compress,
+       .decompress = zcomp_lz4_decompress,
+       .create = zcomp_lz4_create,
+       .destroy = zcomp_lz4_destroy,
+       .name = "lz4",
+};