drivers/block/zram/zcomp.h

   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
   9 struct zcomp_strm {
  10         /* compression/decompression buffer */
  11         void *buffer;
  12         struct crypto_comp *tfm;
  13 };
  14
  15 /* dynamic per-device compression frontend */
  16 struct zcomp {
  17         struct zcomp_strm * __percpu *stream;
  18         const char *name;
  19         struct hlist_node node;
  20 };
  21
  22 int zcomp_cpu_up_prepare(unsigned int cpu, struct hlist_node *node);
  23 int zcomp_cpu_dead(unsigned int cpu, struct hlist_node *node);
  24 ssize_t zcomp_available_show(const char *comp, char *buf);
  25 bool zcomp_available_algorithm(const char *comp);
  26
  27 struct zcomp *zcomp_create(const char *comp);
  28 void zcomp_destroy(struct zcomp *comp);
  29
  30 struct zcomp_strm *zcomp_stream_get(struct zcomp *comp);
  31 void zcomp_stream_put(struct zcomp *comp);
  32
  33 int zcomp_compress(struct zcomp_strm *zstrm,
  34                 const void *src, unsigned int *dst_len);
  35
  36 int zcomp_decompress(struct zcomp_strm *zstrm,
  37                 const void *src, unsigned int src_len, void *dst);
  38
  39 bool zcomp_set_max_streams(struct zcomp *comp, int num_strm);
  40 #endif /* _ZCOMP_H_ */