1 files changed, 72 insertions, 0 deletions
diff --git a/include/linux/mbcache.h b/include/linux/mbcache.h
new file mode 100644
index 000000000000..d457859791cb
--- /dev/null
+++ b/include/linux/mbcache.h
@@ -0,0 +1,72 @@
+/*
+  File: linux/mbcache.h
+
+  (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
+*/
+
+/* Hardwire the number of additional indexes */
+#define MB_CACHE_INDEXES_COUNT 1
+
+struct mb_cache_entry;
+
+struct mb_cache_op {
+	void (*free)(struct mb_cache_entry *);
+};
+
+struct mb_cache {
+	struct list_head		c_cache_list;
+	const char			*c_name;
+	struct mb_cache_op		c_op;
+	atomic_t			c_entry_count;
+	int				c_bucket_bits;
+#ifndef MB_CACHE_INDEXES_COUNT
+	int				c_indexes_count;
+#endif
+	kmem_cache_t			*c_entry_cache;
+	struct list_head		*c_block_hash;
+	struct list_head		*c_indexes_hash[0];
+};
+
+struct mb_cache_entry_index {
+	struct list_head		o_list;
+	unsigned int			o_key;
+};
+
+struct mb_cache_entry {
+	struct list_head		e_lru_list;
+	struct mb_cache			*e_cache;
+	atomic_t			e_used;
+	struct block_device		*e_bdev;
+	sector_t			e_block;
+	struct list_head		e_block_list;
+	struct mb_cache_entry_index	e_indexes[0];
+};
+
+/* Functions on caches */
+
+struct mb_cache * mb_cache_create(const char *, struct mb_cache_op *, size_t,
+				  int, int);
+void mb_cache_shrink(struct mb_cache *, struct block_device *);
+void mb_cache_destroy(struct mb_cache *);
+
+/* Functions on cache entries */
+
+struct mb_cache_entry *mb_cache_entry_alloc(struct mb_cache *);
+int mb_cache_entry_insert(struct mb_cache_entry *, struct block_device *,
+			  sector_t, unsigned int[]);
+void mb_cache_entry_rehash(struct mb_cache_entry *, unsigned int[]);
+void mb_cache_entry_release(struct mb_cache_entry *);
+void mb_cache_entry_takeout(struct mb_cache_entry *);
+void mb_cache_entry_free(struct mb_cache_entry *);
+struct mb_cache_entry *mb_cache_entry_dup(struct mb_cache_entry *);
+struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *,
+					  struct block_device *,
+					  sector_t);
+#if !defined(MB_CACHE_INDEXES_COUNT) || (MB_CACHE_INDEXES_COUNT > 0)
+struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache, int,
+						 struct block_device *, 
+						 unsigned int);
+struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *, int,
+						struct block_device *, 
+						unsigned int);
+#endif