mbcache: remove mbcache

Both ext2 and ext4 are now converted to mbcache2. Remove the old mbcache
code.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
(cherry picked from commit ecd1e644)
CVE-2015-8952
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

fs/Makefile

@@ -41,7 +41,7 @@ obj-$(CONFIG_COMPAT_BINFMT_ELF)	+= compat_binfmt_elf.o
 obj-$(CONFIG_BINFMT_ELF_FDPIC)	+= binfmt_elf_fdpic.o
 obj-$(CONFIG_BINFMT_FLAT)	+= binfmt_flat.o
 
-obj-$(CONFIG_FS_MBCACHE)	+= mbcache.o mbcache2.o
+obj-$(CONFIG_FS_MBCACHE)	+= mbcache2.o
 obj-$(CONFIG_FS_POSIX_ACL)	+= posix_acl.o
 obj-$(CONFIG_NFS_COMMON)	+= nfs_common/
 obj-$(CONFIG_COREDUMP)		+= coredump.o

include/linux/mbcache.h

-/*
-  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);