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 10 struct 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 */ 19 struct zcomp { 20 struct zcomp_strm __percpu *stream; 21 const char *name; 22 struct hlist_node node; 23 }; 24 25 int zcomp_cpu_up_prepare(unsigned int cpu, struct hlist_node *node); 26 int zcomp_cpu_dead(unsigned int cpu, struct hlist_node *node); 27 ssize_t zcomp_available_show(const char *comp, char *buf); 28 bool zcomp_available_algorithm(const char *comp); 29 30 struct zcomp *zcomp_create(const char *alg); 31 void zcomp_destroy(struct zcomp *comp); 32 33 struct zcomp_strm *zcomp_stream_get(struct zcomp *comp); 34 void zcomp_stream_put(struct zcomp *comp); 35 36 int zcomp_compress(struct zcomp_strm *zstrm, 37 const void *src, unsigned int *dst_len); 38 39 int zcomp_decompress(struct zcomp_strm *zstrm, 40 const void *src, unsigned int src_len, void *dst); 41 42 bool zcomp_set_max_streams(struct zcomp *comp, int num_strm); 43 #endif /* _ZCOMP_H_ */ 44