generic/449: always fill up the data device

This is yet another one of those tests that looks at what happens when
we run out of space for more metadata (in this case, xattrs).  Make sure
that the 256M we write to the file to try to stimulate ENOSPC gets
written to the same place that xfs puts xattr data -- the data device.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
diff --git a/tests/generic/449 b/tests/generic/449
index a2d882d..5fd1536 100755
--- a/tests/generic/449
+++ b/tests/generic/449
@@ -43,6 +43,11 @@
 _scratch_mkfs_sized $((256 * 1024 * 1024)) >> $seqres.full 2>&1
 _scratch_mount || _fail "mount failed"
 
+# This is a test of xattr behavior when we run out of disk space for xattrs,
+# so make sure the pwrite goes to the data device and not the rt volume.
+test "$FSTYP" = "xfs" && \
+	$XFS_IO_PROG -c 'chattr -t' $SCRATCH_MNT
+
 TFILE=$SCRATCH_MNT/testfile.$seq
 
 # Create the test file and choose its permissions