drivers/block/zram/zcomp.h

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