FS_GDATA_READ_IO
f2fs_update_iostat(sbi, NULL, FS_GDATA_READ_IO, F2FS_BLKSIZE);
f2fs_update_iostat(fio.sbi, NULL, FS_GDATA_READ_IO,
IOSTAT_INFO_SHOW("fs gc data", FS_GDATA_READ_IO);
__entry->fs_gdrio = iostat[FS_GDATA_READ_IO];