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-rw-r--r--include/linux/mbcache.h52
1 files changed, 52 insertions, 0 deletions
diff --git a/include/linux/mbcache.h b/include/linux/mbcache.h
new file mode 100644
index 000000000000..8e5a10410a30
--- /dev/null
+++ b/include/linux/mbcache.h
@@ -0,0 +1,52 @@
+/*
+ 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 list_head e_lru_list;
+ struct mb_cache *e_cache;
+ unsigned short e_used;
+ unsigned short e_queued;
+ struct block_device *e_bdev;
+ sector_t e_block;
+ struct list_head e_block_list;
+ struct {
+ struct list_head o_list;
+ unsigned int o_key;
+ } e_indexes[0];
+};
+
+struct mb_cache_op {
+ int (*free)(struct mb_cache_entry *, int);
+};
+
+/* 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_release(struct mb_cache_entry *);
+void mb_cache_entry_free(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