xfs: advertise realtime quota support in the xqm stat files

Add a fifth column to this (really old) stat file to advertise that the
kernel supports quota for realtime volumes.  This will be used by
fstests to detect kernel support.

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

Author: Darrick J. Wong

fs/xfs/xfs_stats.c

@@ -115,10 +115,11 @@ void xfs_stats_clearall(struct xfsstats __percpu *stats)
 
 static int xqm_proc_show(struct seq_file *m, void *v)
 {
-	/* maximum; incore; ratio free to inuse; freelist */
-	seq_printf(m, "%d\t%d\t%d\t%u\n",
+	/* maximum; incore; ratio free to inuse; freelist; rtquota */
+	seq_printf(m, "%d\t%d\t%d\t%u\t%s\n",
 		   0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT),
-		   0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT + 1));
+		   0, counter_val(xfsstats.xs_stats, XFSSTAT_END_XQMSTAT + 1),
+		   IS_ENABLED(CONFIG_XFS_RT) ? "rtquota" : "quota");
 	return 0;
 }