[PATCH] mbcache: add gfp_mask parameter to free() callback,

Patch from Andreas Gruenbacher <agruen@suse.de>

Add a gfp_mask parameter to the free() callback so that the callback can
safely do I/O, etc. The free callback can now also fail.  This will be
needed by reiserfs.

The order of entries on the cache entry lru is reversed so that
list_for_each_safe() can be used. Several helper functions that don't
make the code any better are removed. Finally, a couple of cosmetic
things.

include/linux/mbcache.h

@@ -10,7 +10,7 @@
 struct mb_cache_entry;
 
 struct mb_cache_op {
-	void (*free)(struct mb_cache_entry *);
+	int (*free)(struct mb_cache_entry *, int);
 };
 
 struct mb_cache {