delay(HZ/2);
delay(msecs_to_jiffies(500));
xfs_flush_device(	xfs_inode_t	*ip){	struct inode	*inode = LINVFS_GET_IP(XFS_ITOV(ip));	struct vfs	*vfs = XFS_MTOVFS(ip->i_mount);	igrab(inode);	xfs_syncd_queue_work(vfs, inode, xfs_flush_device_work);	delay(HZ/2);	xfs_log_force(ip->i_mount, (xfs_lsn_t)0, XFS_LOG_FORCE|XFS_LOG_SYNC);}