Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux

[~andy/linux] / fs / cachefiles / interface.c

diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index d4c1206af9fca6009a7591a8d36b36684043bf52..43eb5592cdea83c83df854a489edea79d076cfda 100644 (file)
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -377,6 +377,31 @@ static void cachefiles_sync_cache(struct fscache_cache *_cache)
                                    ret);
 }
 
+/*
+ * check if the backing cache is updated to FS-Cache
+ * - called by FS-Cache when evaluates if need to invalidate the cache
+ */
+static bool cachefiles_check_consistency(struct fscache_operation *op)
+{
+       struct cachefiles_object *object;
+       struct cachefiles_cache *cache;
+       const struct cred *saved_cred;
+       int ret;
+
+       _enter("{OBJ%x}", op->object->debug_id);
+
+       object = container_of(op->object, struct cachefiles_object, fscache);
+       cache = container_of(object->fscache.cache,
+                            struct cachefiles_cache, cache);
+
+       cachefiles_begin_secure(cache, &saved_cred);
+       ret = cachefiles_check_auxdata(object);
+       cachefiles_end_secure(cache, saved_cred);
+
+       _leave(" = %d", ret);
+       return ret;
+}
+
 /*
  * notification the attributes on an object have changed
  * - called with reads/writes excluded by FS-Cache
@@ -522,4 +547,5 @@ const struct fscache_cache_ops cachefiles_cache_ops = {
        .write_page             = cachefiles_write_page,
        .uncache_page           = cachefiles_uncache_page,
        .dissociate_pages       = cachefiles_dissociate_pages,
+       .check_consistency      = cachefiles_check_consistency,
 };