1/* SPDX-License-Identifier: GPL-2.0-or-later */ 2/* 3 * Copyright (C) 2014 Sergey Senozhatsky. 4 */ 5 6#ifndef _ZCOMP_H_ 7#define _ZCOMP_H_ 8#include <linux/local_lock.h> 9 10struct zcomp_strm { 11 /* The members ->buffer and ->tfm are protected by ->lock. */ 12 local_lock_t lock; 13 /* compression/decompression buffer */ 14 void *buffer; 15 struct crypto_comp *tfm; 16}; 17 18/* dynamic per-device compression frontend */ 19struct zcomp { 20 struct zcomp_strm __percpu *stream; 21 const char *name; 22 struct hlist_node node; 23}; 24 25int zcomp_cpu_up_prepare(unsigned int cpu, struct hlist_node *node); 26int zcomp_cpu_dead(unsigned int cpu, struct hlist_node *node); 27ssize_t zcomp_available_show(const char *comp, char *buf); 28bool zcomp_available_algorithm(const char *comp); 29 30struct zcomp *zcomp_create(const char *comp); 31void zcomp_destroy(struct zcomp *comp); 32 33struct zcomp_strm *zcomp_stream_get(struct zcomp *comp); 34void zcomp_stream_put(struct zcomp *comp); 35 36int zcomp_compress(struct zcomp_strm *zstrm, 37 const void *src, unsigned int *dst_len); 38 39int zcomp_decompress(struct zcomp_strm *zstrm, 40 const void *src, unsigned int src_len, void *dst); 41 42bool zcomp_set_max_streams(struct zcomp *comp, int num_strm); 43#endif /* _ZCOMP_H_ */ 44