zram: introduce zcomp_params structure

We will store a per-algorithm parameters there (compression level,
dictionary, dictionary size, etc.).

Link: https://lkml.kernel.org/r/20240902105656.1383858-14-senozhatsky@chromium.org
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nick Terrell <terrelln@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/block/zram/zcomp.h b/drivers/block/zram/zcomp.h
index e5eb5ec4c645..217a750fa908 100644
--- a/drivers/block/zram/zcomp.h
+++ b/drivers/block/zram/zcomp.h
@@ -2,8 +2,17 @@
 
 #ifndef _ZCOMP_H_
 #define _ZCOMP_H_
+
 #include <linux/local_lock.h>
 
+#define ZCOMP_PARAM_NO_LEVEL	INT_MIN
+
+struct zcomp_params {
+	void *dict;
+	size_t dict_sz;
+	s32 level;
+};
+
 struct zcomp_strm {
 	/* The members ->buffer and ->tfm are protected by ->lock. */
 	local_lock_t lock;
@@ -19,7 +28,7 @@ struct zcomp_ops {
 	int (*decompress)(void *ctx, const unsigned char *src, size_t src_len,
 			  unsigned char *dst, size_t dst_len);
 
-	void *(*create_ctx)(void);
+	void *(*create_ctx)(struct zcomp_params *params);
 	void (*destroy_ctx)(void *ctx);
 
 	const char *name;
@@ -29,6 +38,7 @@ struct zcomp_ops {
 struct zcomp {
 	struct zcomp_strm __percpu *stream;
 	const struct zcomp_ops *ops;
+	struct zcomp_params *params;
 	struct hlist_node node;
 };
 
@@ -37,7 +47,7 @@ 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 *alg);
+struct zcomp *zcomp_create(const char *alg, struct zcomp_params *params);
 void zcomp_destroy(struct zcomp *comp);
 
 struct zcomp_strm *zcomp_stream_get(struct zcomp *comp);