xfs: add missing error check in xfs_prepare_shift()

commit 1749d1ea89bdf3181328b7d846e609d5a0e53e50 upstream.

xfs_prepare_shift() fails to check the error return from
xfs_flush_unmap_range(). If the latter fails, that could lead to an
insert/collapse range operation over a delalloc range, which is not
supported.

Add an error check and return appropriately. This is reproduced
rarely by generic/475.

Fixes: 7f9f71be84bc ("xfs: extent shifting doesn't fully invalidate page cache")
Signed-off-by: NBrian Foster <bfoster@redhat.com>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: NAllison Collins <allison.henderson@oracle.com>
Reviewed-by: NDave Chinner <dchinner@redhat.com>
Cc: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/xfs/xfs_bmap_util.c

@@ -1245,6 +1245,8 @@ xfs_prepare_shift(
 	 * about to shift down every extent from offset to EOF.
 	 */
 	error = xfs_flush_unmap_range(ip, offset, XFS_ISIZE(ip));
+	if (error)
+		return error;
 
 	/*
 	 * Clean out anything hanging around in the cow fork now that