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Diffstat (limited to '')
| -rw-r--r-- | drivers/block/zram/zcomp.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h new file mode 100644 index 000000000..40f6420f4 --- /dev/null +++ b/drivers/block/zram/zcomp.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2014 Sergey Senozhatsky. + */ + +#ifndef _ZCOMP_H_ +#define _ZCOMP_H_ +#include <linux/local_lock.h> + +struct zcomp_strm { + /* The members ->buffer and ->tfm are protected by ->lock. */ + local_lock_t lock; + /* 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_ */ |