drbd: Ensure that an epoch contains only requests of one kind
The assert in drbd_req.c:755 forces us to have only requests of
one kind in an epoch. The two kinds we distinguish here are:
local-only or mirrored.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 1061b9f..34ee8e4 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -1261,9 +1261,14 @@
if (os.conn < C_CONNECTED && ns.conn >= C_CONNECTED)
drbd_resume_al(mdev);
- if (os.conn == C_AHEAD && ns.conn != C_AHEAD)
+ /* Start a new epoch in case we start to mirror write requests */
+ if (!drbd_should_do_remote(os) && drbd_should_do_remote(ns))
tl_forget(mdev);
+ /* Do not add local-only requests to an epoch with mirrored requests */
+ if (drbd_should_do_remote(os) && !drbd_should_do_remote(ns))
+ set_bit(CREATE_BARRIER, &mdev->flags);
+
ascw = kmalloc(sizeof(*ascw), GFP_ATOMIC);
if (ascw) {
ascw->os = os;