F2FS_GET_BLOCK_PRECACHE
if (flag == F2FS_GET_BLOCK_PRECACHE)
case F2FS_GET_BLOCK_PRECACHE:
if (flag == F2FS_GET_BLOCK_PRECACHE) {
if (flag == F2FS_GET_BLOCK_PRECACHE) {
err = f2fs_map_blocks(inode, &map, F2FS_GET_BLOCK_PRECACHE);