[PATCH 19/20] drbd: consistently use list_add_tail for peer_request tracking

[Philipp Reisner]

From: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>

Keep the epoch entry lists (active_ee, read_ee, sync_ee, ...)
consistently "oldest first".  That way finding the oldest not yet
successfully processed request is simply list_first_entry_or_null.

Signed-off-by: Philipp Reisner <philipp.reisner@xxxxxxxxxx>
Signed-off-by: Lars Ellenberg <lars.ellenberg@xxxxxxxxxx>
---
 drivers/block/drbd/drbd_receiver.c | 4 ++--
 drivers/block/drbd/drbd_worker.c   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 3a3c489..db5c580 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1777,7 +1777,7 @@ static int recv_resync_read(struct drbd_peer_device *peer_device, sector_t secto
 	peer_req->w.cb = e_end_resync_block;
 
 	spin_lock_irq(&device->resource->req_lock);
-	list_add(&peer_req->w.list, &device->sync_ee);
+	list_add_tail(&peer_req->w.list, &device->sync_ee);
 	spin_unlock_irq(&device->resource->req_lock);
 
 	atomic_add(pi->size >> 9, &device->rs_sect_ev);
@@ -2341,7 +2341,7 @@ static int receive_Data(struct drbd_connection *connection, struct packet_info *
 	 * active_ee to become empty in drbd_submit_peer_request();
 	 * better not add ourselves here. */
 	if ((peer_req->flags & EE_IS_TRIM_USE_ZEROOUT) == 0)
-		list_add(&peer_req->w.list, &device->active_ee);
+		list_add_tail(&peer_req->w.list, &device->active_ee);
 	spin_unlock_irq(&device->resource->req_lock);
 
 	if (device->state.conn == C_SYNC_TARGET)
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index 49b8873..ad57129 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -410,7 +410,7 @@ static int read_for_csum(struct drbd_peer_device *peer_device, sector_t sector,
 
 	peer_req->w.cb = w_e_send_csum;
 	spin_lock_irq(&device->resource->req_lock);
-	list_add(&peer_req->w.list, &device->read_ee);
+	list_add_tail(&peer_req->w.list, &device->read_ee);
 	spin_unlock_irq(&device->resource->req_lock);
 
 	atomic_add(size >> 9, &device->rs_sect_ev);
-- 
1.9.1

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