tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#ifndef _ZCOMP_H_
11#define _ZCOMP_H_
12
13struct zcomp_strm {
14 /* compression/decompression buffer */
15 void *buffer;
16 /*
17 * The private data of the compression stream, only compression
18 * stream backend can touch this (e.g. compression algorithm
19 * working memory)
20 */
21 void *private;
22};
23
24/* static compression backend */
25struct zcomp_backend {
26 int (*compress)(const unsigned char *src, unsigned char *dst,
27 size_t *dst_len, void *private);
28
29 int (*decompress)(const unsigned char *src, size_t src_len,
30 unsigned char *dst);
31
32 void *(*create)(gfp_t flags);
33 void (*destroy)(void *private);
34
35 const char *name;
36};
37
38/* dynamic per-device compression frontend */
39struct zcomp {
40 struct zcomp_strm * __percpu *stream;
41 struct zcomp_backend *backend;
42 struct notifier_block notifier;
43};
44
45ssize_t zcomp_available_show(const char *comp, char *buf);
46bool zcomp_available_algorithm(const char *comp);
47
48struct zcomp *zcomp_create(const char *comp);
49void zcomp_destroy(struct zcomp *comp);
50
51struct zcomp_strm *zcomp_strm_find(struct zcomp *comp);
52void zcomp_strm_release(struct zcomp *comp, struct zcomp_strm *zstrm);
53
54int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
55 const unsigned char *src, size_t *dst_len);
56
57int zcomp_decompress(struct zcomp *comp, const unsigned char *src,
58 size_t src_len, unsigned char *dst);
59
60bool zcomp_set_max_streams(struct zcomp *comp, int num_strm);
61#endif /* _ZCOMP_H_ */