vfs_write_suspend
error = vfs_write_suspend(mp, VS_SKIP_UNMOUNT);
error = vfs_write_suspend(mp, 0);
error = vfs_write_suspend(mp, 0);
int vfs_write_suspend(struct mount *mp, int flags);
if ((error = vfs_write_suspend(vp->v_mount, 0)) != 0) {
if ((error = vfs_write_suspend(mp, VS_SKIP_UNMOUNT)) != 0)