Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / linux / mbcache.h

diff --git a/kernel/include/linux/mbcache.h b/kernel/include/linux/mbcache.h
new file mode 100644 (file)
index 0000000..6a392e7
--- /dev/null
+++ b/kernel/include/linux/mbcache.h
@@ -0,0 +1,55 @@
+/*
+  File: linux/mbcache.h
+
+  (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
+*/
+struct mb_cache_entry {
+       struct list_head                e_lru_list;
+       struct mb_cache                 *e_cache;
+       unsigned short                  e_used;
+       unsigned short                  e_queued;
+       atomic_t                        e_refcnt;
+       struct block_device             *e_bdev;
+       sector_t                        e_block;
+       struct hlist_bl_node            e_block_list;
+       struct {
+               struct hlist_bl_node    o_list;
+               unsigned int            o_key;
+       } e_index;
+       struct hlist_bl_head            *e_block_hash_p;
+       struct hlist_bl_head            *e_index_hash_p;
+};
+
+struct mb_cache {
+       struct list_head                c_cache_list;
+       const char                      *c_name;
+       atomic_t                        c_entry_count;
+       int                             c_max_entries;
+       int                             c_bucket_bits;
+       struct kmem_cache               *c_entry_cache;
+       struct hlist_bl_head            *c_block_hash;
+       struct hlist_bl_head            *c_index_hash;
+};
+
+/* Functions on caches */
+
+struct mb_cache *mb_cache_create(const char *, int);
+void mb_cache_shrink(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 *, gfp_t);
+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);
+struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
+                                                struct block_device *, 
+                                                unsigned int);
+struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache_entry *,
+                                               struct block_device *, 
+                                               unsigned int);