CacheFiles: Implement interface to check cache consistency
Implement the FS-Cache interface to check the consistency of a cache object in
CacheFiles.
Original-author: Hongyi Jia <jiayisuse@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Hongyi Jia <jiayisuse@gmail.com>
cc: Milosz Tanski <milosz@adfin.com>
diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c
index d4c1206..43eb559 100644
--- a/fs/cachefiles/interface.c
+++ b/fs/cachefiles/interface.c
@@ -378,6 +378,31 @@
}
/*
+ * 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 @@
.write_page = cachefiles_write_page,
.uncache_page = cachefiles_uncache_page,
.dissociate_pages = cachefiles_dissociate_pages,
+ .check_consistency = cachefiles_check_consistency,
};