linux/drivers/block/zram/zcomp.h

/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _ZCOMP_H_
#define _ZCOMP_H_

#include <linux/local_lock.h>

#define ZCOMP_PARAM_NO_LEVEL …

/*
 * Immutable driver (backend) parameters. The driver may attach private
 * data to it (e.g. driver representation of the dictionary, etc.).
 *
 * This data is kept per-comp and is shared among execution contexts.
 */
struct zcomp_params { … };

/*
 * Run-time driver context - scratch buffers, etc. It is modified during
 * request execution (compression/decompression), cannot be shared, so
 * it's in per-CPU area.
 */
struct zcomp_ctx { … };

struct zcomp_strm { … };

struct zcomp_req { … };

struct zcomp_ops { … };

/* dynamic per-device compression frontend */
struct zcomp { … };

int zcomp_cpu_up_prepare(unsigned int cpu, struct hlist_node *node);
int zcomp_cpu_dead(unsigned int cpu, struct hlist_node *node);
ssize_t zcomp_available_show(const char *comp, char *buf);
bool zcomp_available_algorithm(const char *comp);

struct zcomp *zcomp_create(const char *alg, struct zcomp_params *params);
void zcomp_destroy(struct zcomp *comp);

struct zcomp_strm *zcomp_stream_get(struct zcomp *comp);
void zcomp_stream_put(struct zcomp *comp);

int zcomp_compress(struct zcomp *comp, struct zcomp_strm *zstrm,
		   const void *src, unsigned int *dst_len);
int zcomp_decompress(struct zcomp *comp, struct zcomp_strm *zstrm,
		     const void *src, unsigned int src_len, void *dst);

#endif /* _ZCOMP_H_ */