gfs2: Set qd_sync_gen in do_sync

Func do_sync was called in two places: gfs2_quota_unlock and
gfs2_quota_sync. In gfs2_quota_sync it updated qd_sync_gen to the latest
superblock sync gen, if do_sync was successful. In gfs2_quota_unlock it
didn't update the value. That can only lead to extra work, for example,
if the value is synced by gfs2_quota_unlock but still has the old value.

This patch moves the setting of qd_sync_gen inside do_sync so we are
guaranteed consistency.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Author: AstralBob

fs/gfs2/quota.c

@@ -991,6 +991,10 @@ static int do_sync(unsigned int num_qd, struct gfs2_quota_data **qda)
 		       GFS2_LOG_HEAD_FLUSH_NORMAL | GFS2_LFC_DO_SYNC);
 out:
 	gfs2_qa_put(ip);
+	if (!error) {
+		for (x = 0; x < num_qd; x++)
+			qda[x]->qd_sync_gen = sdp->sd_quota_sync_gen;
+	}
 	return error;
 }
 
@@ -1334,10 +1338,6 @@ int gfs2_quota_sync(struct super_block *sb, int type)
 		if (num_qd) {
 			if (!error)
 				error = do_sync(num_qd, qda);
-			if (!error)
-				for (x = 0; x < num_qd; x++)
-					qda[x]->qd_sync_gen =
-						sdp->sd_quota_sync_gen;
 
 			for (x = 0; x < num_qd; x++)
 				qd_unlock(qda[x]);