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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> | |
d913897a KK |
13 | #include <linux/vmalloc.h> |
14 | #include <linux/mm.h> | |
e7e1ef43 SS |
15 | |
16 | #include "zcomp_lzo.h" | |
17 | ||
75d8947a | 18 | static void *lzo_create(gfp_t flags) |
e7e1ef43 | 19 | { |
d913897a KK |
20 | void *ret; |
21 | ||
e02d238c | 22 | ret = kmalloc(LZO1X_MEM_COMPRESS, flags); |
d913897a KK |
23 | if (!ret) |
24 | ret = __vmalloc(LZO1X_MEM_COMPRESS, | |
e02d238c | 25 | flags | __GFP_HIGHMEM, |
d913897a KK |
26 | PAGE_KERNEL); |
27 | return ret; | |
e7e1ef43 SS |
28 | } |
29 | ||
30 | static void lzo_destroy(void *private) | |
31 | { | |
d913897a | 32 | kvfree(private); |
e7e1ef43 SS |
33 | } |
34 | ||
35 | static int lzo_compress(const unsigned char *src, unsigned char *dst, | |
36 | size_t *dst_len, void *private) | |
37 | { | |
38 | int ret = lzo1x_1_compress(src, PAGE_SIZE, dst, dst_len, private); | |
39 | return ret == LZO_E_OK ? 0 : ret; | |
40 | } | |
41 | ||
42 | static int lzo_decompress(const unsigned char *src, size_t src_len, | |
43 | unsigned char *dst) | |
44 | { | |
45 | size_t dst_len = PAGE_SIZE; | |
46 | int ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len); | |
47 | return ret == LZO_E_OK ? 0 : ret; | |
48 | } | |
49 | ||
50 | struct zcomp_backend zcomp_lzo = { | |
51 | .compress = lzo_compress, | |
52 | .decompress = lzo_decompress, | |
53 | .create = lzo_create, | |
54 | .destroy = lzo_destroy, | |
55 | .name = "lzo", | |
56 | }; |