diff options
Diffstat (limited to 'drivers/block/zram/zcomp.h')
| -rw-r--r-- | drivers/block/zram/zcomp.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h new file mode 100644 index 000000000..41c1002a7 --- /dev/null +++ b/drivers/block/zram/zcomp.h @@ -0,0 +1,44 @@ +/* + * Copyright (C) 2014 Sergey Senozhatsky. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef _ZCOMP_H_ +#define _ZCOMP_H_ + +struct zcomp_strm { + /* compression/decompression buffer */ + void *buffer; + struct crypto_comp *tfm; +}; + +/* dynamic per-device compression frontend */ +struct zcomp { + struct zcomp_strm * __percpu *stream; + const char *name; + struct hlist_node node; +}; + +int zcomp_cpu_up_prepare(unsigned int cpu, struct hlist_node *node); +int zcomp_cpu_dead(unsigned int cpu, struct hlist_node *node); +ssize_t zcomp_available_show(const char *comp, char *buf); +bool zcomp_available_algorithm(const char *comp); + +struct zcomp *zcomp_create(const char *comp); +void zcomp_destroy(struct zcomp *comp); + +struct zcomp_strm *zcomp_stream_get(struct zcomp *comp); +void zcomp_stream_put(struct zcomp *comp); + +int zcomp_compress(struct zcomp_strm *zstrm, + const void *src, unsigned int *dst_len); + +int zcomp_decompress(struct zcomp_strm *zstrm, + const void *src, unsigned int src_len, void *dst); + +bool zcomp_set_max_streams(struct zcomp *comp, int num_strm); +#endif /* _ZCOMP_H_ */ |