drivers/block/zram/zcomp_lz4.c

   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
  16 static void *zcomp_lz4_create(void)
  17 {
  18         return kzalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);
  19 }
  20
  21 static void zcomp_lz4_destroy(void *private)
  22 {
  23         kfree(private);
  24 }
  25
  26 static 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
  33 static 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
  41 struct 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 };