filemap_check_wb_err 2177 fs/btrfs/file.c 		ret = filemap_check_wb_err(inode->i_mapping, file->f_wb_err);
filemap_check_wb_err  587 fs/gfs2/lops.c 		ret = filemap_check_wb_err(mapping, since);
filemap_check_wb_err  238 fs/nfsd/filecache.c 	return filemap_check_wb_err(file->f_mapping, READ_ONCE(file->f_wb_err));