[XFS] Ensure max diosize reported is aligned with minimum diosize.

SGI-PV: 910890
SGI-Modid: xfs-linux-melb:xfs-kern:24689a
Signed-off-by: NNathan Scott <nathans@sgi.com>

fs/xfs/linux-2.6/xfs_ioctl.c

@@ -751,7 +751,7 @@ xfs_ioctl(
 			mp->m_rtdev_targp : mp->m_ddev_targp;
 
 		da.d_mem = da.d_miniosz = 1 << target->pbr_sshift;
-		da.d_maxiosz = INT_MAX;
+		da.d_maxiosz = INT_MAX & ~(da.d_miniosz - 1);
 
 		if (copy_to_user(arg, &da, sizeof(da)))
 			return -XFS_ERROR(EFAULT);