Commit | Line | Data |
---|---|---|
94f740fc SQK |
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 | #include <linux/vmalloc.h> | |
14 | #include <linux/mm.h> | |
15 | ||
16 | #include "zcomp_lz4.h" | |
17 | ||
cd681c03 | 18 | static void *zcomp_lz4_create(gfp_t flags) |
94f740fc SQK |
19 | { |
20 | void *ret; | |
21 | ||
31c4cf41 | 22 | ret = kmalloc(LZ4_MEM_COMPRESS, flags); |
94f740fc SQK |
23 | if (!ret) |
24 | ret = __vmalloc(LZ4_MEM_COMPRESS, | |
31c4cf41 | 25 | flags | __GFP_HIGHMEM, |
94f740fc SQK |
26 | PAGE_KERNEL); |
27 | return ret; | |
28 | } | |
29 | ||
30 | static void zcomp_lz4_destroy(void *private) | |
31 | { | |
32 | kvfree(private); | |
33 | } | |
34 | ||
35 | static int zcomp_lz4_compress(const unsigned char *src, unsigned char *dst, | |
36 | size_t *dst_len, void *private) | |
37 | { | |
38 | /* return : Success if return 0 */ | |
39 | return lz4_compress(src, PAGE_SIZE, dst, dst_len, private); | |
40 | } | |
41 | ||
42 | static int zcomp_lz4_decompress(const unsigned char *src, size_t src_len, | |
43 | unsigned char *dst) | |
44 | { | |
45 | size_t dst_len = PAGE_SIZE; | |
46 | /* return : Success if return 0 */ | |
47 | return lz4_decompress_unknownoutputsize(src, src_len, dst, &dst_len); | |
48 | } | |
49 | ||
50 | struct zcomp_backend zcomp_lz4 = { | |
51 | .compress = zcomp_lz4_compress, | |
52 | .decompress = zcomp_lz4_decompress, | |
53 | .create = zcomp_lz4_create, | |
54 | .destroy = zcomp_lz4_destroy, | |
55 | .name = "lz4", | |
56 | }; |