GFS2: If we use up our block reservation, request more next time

If we run out of blocks for a given multi-block allocation, we obviously
did not reserve enough. We should reserve more blocks for the next
reservation to reduce fragmentation. This patch increases the size hint
for reservations when they run out.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/rgrp.c

@@ -2251,6 +2251,9 @@ static void gfs2_adjust_reservation(struct gfs2_inode *ip,
 			trace_gfs2_rs(rs, TRACE_RS_CLAIM);
 			if (rs->rs_free && !ret)
 				goto out;
+			/* We used up our block reservation, so we should
+			   reserve more blocks next time. */
+			atomic_add(RGRP_RSRV_ADDBLKS, &rs->rs_sizehint);
 		}
 		__rs_deltree(rs);
 	}