LXR linux/drivers/block/zram/zcomp

   1/*
   2 * Copyright (C) 2014 Sergey Senozhatsky.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of the GNU General Public License
   6 * as published by the Free Software Foundation; either version
   7 * 2 of the License, or (at your option) any later version.
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/slab.h>
  12#include <linux/lz4.h>
  13
  14#include "zcomp_lz4.h"
  15
  16static void *zcomp_lz4_create(void)
  17{
  18        return kzalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
  19}
  20
  21static void zcomp_lz4_destroy(void *private)
  22{
  23        kfree(private);
  24}
  25
  26static int zcomp_lz4_compress(const unsigned char *src, unsigned char *dst,
  27                size_t *dst_len, void *private)
  28{
  29        /* return  : Success if return 0 */
  30        return lz4_compress(src, PAGE_SIZE, dst, dst_len, private);
  31}
  32
  33static int zcomp_lz4_decompress(const unsigned char *src, size_t src_len,
  34                unsigned char *dst)
  35{
  36        size_t dst_len = PAGE_SIZE;
  37        /* return  : Success if return 0 */
  38        return lz4_decompress_unknownoutputsize(src, src_len, dst, &dst_len);
  39}
  40
  41struct zcomp_backend zcomp_lz4 = {
  42        .compress = zcomp_lz4_compress,
  43        .decompress = zcomp_lz4_decompress,
  44        .create = zcomp_lz4_create,
  45        .destroy = zcomp_lz4_destroy,
  46        .name = "lz4",
  47};
  48