writeat
if (writeat(dirfd(debugfs), "failslab/ignore-gfp-wait", "N"))
writeat(dirfd(debugfs), "fail_page_alloc/ignore-gfp-wait", "N");
writeat(dirfd(debugfs), "fail_page_alloc/ignore-gfp-highmem", "N");
writeat(dirfd(debugfs), fn, "0");