mbcache2: rename to mbcache
Since old mbcache code is gone, let's rename new code to mbcache since
number 2 is now meaningless. This is just a mechanical replacement.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/include/linux/mbcache.h b/include/linux/mbcache.h
new file mode 100644
index 0000000..a74a1f3
--- /dev/null
+++ b/include/linux/mbcache.h
@@ -0,0 +1,53 @@
+#ifndef _LINUX_MBCACHE_H
+#define _LINUX_MBCACHE_H
+
+#include <linux/hash.h>
+#include <linux/list_bl.h>
+#include <linux/list.h>
+#include <linux/atomic.h>
+#include <linux/fs.h>
+
+struct mb_cache;
+
+struct mb_cache_entry {
+ /* List of entries in cache - protected by cache->c_list_lock */
+ struct list_head e_list;
+ /* Hash table list - protected by bitlock in e_hash_list_head */
+ struct hlist_bl_node e_hash_list;
+ atomic_t e_refcnt;
+ /* Key in hash - stable during lifetime of the entry */
+ u32 e_key;
+ /* Block number of hashed block - stable during lifetime of the entry */
+ sector_t e_block;
+ /*
+ * Head of hash list (for list bit lock) - stable. Combined with
+ * referenced bit of entry
+ */
+ unsigned long _e_hash_list_head;
+};
+
+struct mb_cache *mb_cache_create(int bucket_bits);
+void mb_cache_destroy(struct mb_cache *cache);
+
+int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key,
+ sector_t block);
+void __mb_cache_entry_free(struct mb_cache_entry *entry);
+static inline int mb_cache_entry_put(struct mb_cache *cache,
+ struct mb_cache_entry *entry)
+{
+ if (!atomic_dec_and_test(&entry->e_refcnt))
+ return 0;
+ __mb_cache_entry_free(entry);
+ return 1;
+}
+
+void mb_cache_entry_delete_block(struct mb_cache *cache, u32 key,
+ sector_t block);
+struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
+ u32 key);
+struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache,
+ struct mb_cache_entry *entry);
+void mb_cache_entry_touch(struct mb_cache *cache,
+ struct mb_cache_entry *entry);
+
+#endif /* _LINUX_MBCACHE_H */