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e7e1ef43 SS |
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 | ||
18 | static void *lzo_create(void) | |
19 | { | |
d913897a KK |
20 | void *ret; |
21 | ||
22 | /* | |
23 | * This function can be called in swapout/fs write path | |
24 | * so we can't use GFP_FS|IO. And it assumes we already | |
25 | * have at least one stream in zram initialization so we | |
26 | * don't do best effort to allocate more stream in here. | |
27 | * A default stream will work well without further multiple | |
28 | * streams. That's why we use NORETRY | NOWARN. | |
29 | */ | |
30 | ret = kzalloc(LZO1X_MEM_COMPRESS, GFP_NOIO | __GFP_NORETRY | | |
31 | __GFP_NOWARN); | |
32 | if (!ret) | |
33 | ret = __vmalloc(LZO1X_MEM_COMPRESS, | |
34 | GFP_NOIO | __GFP_NORETRY | __GFP_NOWARN | | |
35 | __GFP_ZERO | __GFP_HIGHMEM, | |
36 | PAGE_KERNEL); | |
37 | return ret; | |
e7e1ef43 SS |
38 | } |
39 | ||
40 | static void lzo_destroy(void *private) | |
41 | { | |
d913897a | 42 | kvfree(private); |
e7e1ef43 SS |
43 | } |
44 | ||
45 | static int lzo_compress(const unsigned char *src, unsigned char *dst, | |
46 | size_t *dst_len, void *private) | |
47 | { | |
48 | int ret = lzo1x_1_compress(src, PAGE_SIZE, dst, dst_len, private); | |
49 | return ret == LZO_E_OK ? 0 : ret; | |
50 | } | |
51 | ||
52 | static int lzo_decompress(const unsigned char *src, size_t src_len, | |
53 | unsigned char *dst) | |
54 | { | |
55 | size_t dst_len = PAGE_SIZE; | |
56 | int ret = lzo1x_decompress_safe(src, src_len, dst, &dst_len); | |
57 | return ret == LZO_E_OK ? 0 : ret; | |
58 | } | |
59 | ||
60 | struct zcomp_backend zcomp_lzo = { | |
61 | .compress = lzo_compress, | |
62 | .decompress = lzo_decompress, | |
63 | .create = lzo_create, | |
64 | .destroy = lzo_destroy, | |
65 | .name = "lzo", | |
66 | }; |