Why xfs_change_file_space is synchronous

[Shailendra Tripathi <stripathi@xxxxxxxxx>]

Hi,
	While looking at xfs_change_file_space, I noticed that the transaction 
is made synchronous.

xfs_change_file_space()
...
        if (setprealloc)
                ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC;
        else if (clrprealloc)
                ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC;

        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
        xfs_trans_set_sync(tp); --> Why do we need to make it synchronous ?


        error = xfs_trans_commit(tp, 0, NULL);

	Why this transaction is made synchronous. I can't think of the scenario 
where log will not be able to recover this if it is asynchronous. What 
might be the potential reason for making it synchronous ?

Regards,
Shailendra