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 13 struct zcomp_strm { 14 /* compression/decompression buffer */ 15 void *buffer; 16 struct crypto_comp *tfm; 17 }; 18 19 /* static compression backend */ 20 struct zcomp_backend { 21 int (*compress)(const unsigned char *src, unsigned char *dst, 22 size_t *dst_len, void *private); 23 24 int (*decompress)(const unsigned char *src, size_t src_len, 25 unsigned char *dst); 26 27 void *(*create)(gfp_t flags); 28 void (*destroy)(void *private); 29 30 const char *name; 31 }; 32 33 /* dynamic per-device compression frontend */ 34 struct zcomp { 35 struct zcomp_strm * __percpu *stream; 36 struct zcomp_backend *backend; 37 struct notifier_block notifier; 38 39 const char *name; 40 }; 41 42 ssize_t zcomp_available_show(const char *comp, char *buf); 43 bool zcomp_available_algorithm(const char *comp); 44 45 struct zcomp *zcomp_create(const char *comp); 46 void zcomp_destroy(struct zcomp *comp); 47 48 struct zcomp_strm *zcomp_stream_get(struct zcomp *comp); 49 void zcomp_stream_put(struct zcomp *comp); 50 51 int zcomp_compress(struct zcomp_strm *zstrm, 52 const void *src, unsigned int *dst_len); 53 54 int zcomp_decompress(struct zcomp_strm *zstrm, 55 const void *src, unsigned int src_len, void *dst); 56 57 bool zcomp_set_max_streams(struct zcomp *comp, int num_strm); 58 #endif /* _ZCOMP_H_ */ 59