Ensure passthrough and keep_cache are mutually exclusive

libfuse/lib/fuse.cpp

@@ -2373,7 +2373,7 @@ fuse_lib_open(fuse_req_t             req,
       err = f->fs->op.open(path,&ffi);
       if(!err)
         {
-          if(ffi.auto_cache)
+          if(ffi.auto_cache && (ffi.passthrough == false))
             open_auto_cache(f,hdr_->nodeid,path,&ffi);
         }
     }

src/option_parser.cpp

@@ -262,8 +262,8 @@ _postprocess_passthrough(Config::Write &cfg_)
   if(cfg_->cache_files == CacheFiles::ENUM::OFF)
     {
       SysLog::warning("'cache.files' can not be 'off' when using 'passthrough'."
-                      " Setting 'cache.files=auto-full'");
-      cfg_->cache_files = CacheFiles::ENUM::AUTO_FULL;
+                      " Setting 'cache.files=full'");
+      cfg_->cache_files = CacheFiles::ENUM::FULL;
     }
 
   if(cfg_->writeback_cache == true)