Release 4.7 drivers/block/zram/zcomp.h

/*
 * Copyright (C) 2014 Sergey Senozhatsky.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef _ZCOMP_H_

#define _ZCOMP_H_


struct zcomp_strm {
	/* compression/decompression buffer */
	
void *buffer;
	/*
         * The private data of the compression stream, only compression
         * stream backend can touch this (e.g. compression algorithm
         * working memory)
         */
	
void *private;
};

/* static compression backend */

struct zcomp_backend {
	
int (*compress)(const unsigned char *src, unsigned char *dst,
			size_t *dst_len, void *private);

	
int (*decompress)(const unsigned char *src, size_t src_len,
			unsigned char *dst);

	
void *(*create)(gfp_t flags);
	
void (*destroy)(void *private);

	
const char *name;
};

/* dynamic per-device compression frontend */

struct zcomp {
	
struct zcomp_strm * __percpu *stream;
	
struct zcomp_backend *backend;
	
struct notifier_block notifier;
};

ssize_t zcomp_available_show(const char *comp, char *buf);
bool zcomp_available_algorithm(const char *comp);

struct zcomp *zcomp_create(const char *comp);
void zcomp_destroy(struct zcomp *comp);

struct zcomp_strm *zcomp_strm_find(struct zcomp *comp);
void zcomp_strm_release(struct zcomp *comp, struct zcomp_strm *zstrm);

int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
		const unsigned char *src, size_t *dst_len);

int zcomp_decompress(struct zcomp *comp, const unsigned char *src,
		size_t src_len, unsigned char *dst);

bool zcomp_set_max_streams(struct zcomp *comp, int num_strm);
#endif /* _ZCOMP_H_ */
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sergey senozhatsky
sergey senozhatsky
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minchan kim
minchan kim
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Directory: drivers/block/zram

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