FI_NEED_IPU
if (IS_F2FS_IPU_FSYNC(sbi) && is_inode_flag_set(inode, FI_NEED_IPU))
set_inode_flag(inode, FI_NEED_IPU);
clear_inode_flag(inode, FI_NEED_IPU);
is_inode_flag_set(inode, FI_NEED_IPU))