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 /* dynamic per-device compression frontend */ 20 struct zcomp { 21 struct zcomp_strm * __percpu *stream; 22 struct notifier_block notifier; 23 24 const char *name; 25 }; 26 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 *comp); 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