gfs2: call truncate_inode_pages_final for address space glocks

Before this patch, we were not calling truncate_inode_pages_final for the
address space for glocks, which left the possibility of a leak. We now
take care of the problem instead of complaining, and we do it during
glock tear-down..
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/glock.c

@@ -270,7 +270,12 @@ static void __gfs2_glock_put(struct gfs2_glock *gl)
 	gfs2_glock_remove_from_lru(gl);
 	spin_unlock(&gl->gl_lockref.lock);
 	GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
-	GLOCK_BUG_ON(gl, mapping && mapping->nrpages && !gfs2_withdrawn(sdp));
+	if (mapping) {
+		truncate_inode_pages_final(mapping);
+		if (!gfs2_withdrawn(sdp))
+			GLOCK_BUG_ON(gl, mapping->nrpages ||
+				     mapping->nrexceptional);
+	}
 	trace_gfs2_glock_put(gl);
 	sdp->sd_lockstruct.ls_ops->lm_put_lock(gl);
 }