drivers/block/zram/zcomp_lzo.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/lzo.h>
  13
  14 #include "zcomp_lzo.h"
  15
  16 static void *lzo_create(void)
  17 {
  18         return kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
  19 }
  20
  21 static void lzo_destroy(void *private)
  22 {
  23         kfree(private);
  24 }
  25
  26 static int lzo_compress(const unsigned char *src, unsigned char *dst,
  27                 size_t *dst_len, void *private)
  28 {
  29         int ret = lzo1x_1_compress(src, PAGE_SIZE, dst, dst_len, private);
  30         return ret == LZO_E_OK ? 0 : ret;
  31 }
  32
  33 static int lzo_decompress(const unsigned char *src, size_t src_len,
  34                 unsigned char *dst)
  35 {
  36         size_t dst_len = PAGE_SIZE;
  37         int ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len);
  38         return ret == LZO_E_OK ? 0 : ret;
  39 }
  40
  41 struct zcomp_backend zcomp_lzo = {
  42         .compress = lzo_compress,
  43         .decompress = lzo_decompress,
  44         .create = lzo_create,
  45         .destroy = lzo_destroy,
  46         .name = "lzo",
  47 };