xfs: disable FITRIM for zoned RT devices

The zoned allocator unconditionally issues zone resets or discards after
emptying an entire zone, so supporting FITRIM for a zoned RT device is
not useful.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

fs/xfs/xfs_discard.c

@@ -844,7 +844,8 @@ xfs_ioc_trim(
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
-	if (mp->m_rtdev_targp &&
+
+	if (mp->m_rtdev_targp && !xfs_has_zoned(mp) &&
 	    bdev_max_discard_sectors(mp->m_rtdev_targp->bt_bdev))
 		rt_bdev = mp->m_rtdev_targp->bt_bdev;
 	if (!bdev_max_discard_sectors(mp->m_ddev_targp->bt_bdev) && !rt_bdev)