drbd: New configuration parameters for dealing with network congestion

net {
    on_congestion {block|pull-ahead|disconnect};
    congestion-fill {sectors};
    congestion-extents {al-extents};
}

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index ef44c7a0638c..03a08baabf11 100644
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -96,6 +96,12 @@ enum drbd_on_no_data {
         OND_SUSPEND_IO
 };
 
+enum drbd_on_congestion {
+        OC_BLOCK,
+        OC_PULL_AHEAD,
+        OC_DISCONNECT,
+};
+
 /* KEEP the order, do not delete or insert. Only append. */
 enum drbd_ret_codes {
         ERR_CODE_BASE           = 100,
@@ -146,6 +152,7 @@ enum drbd_ret_codes {
         ERR_PERM                = 152,
         ERR_NEED_APV_93         = 153,
         ERR_STONITH_AND_PROT_A  = 154,
+        ERR_CONG_NOT_PROTO_A    = 155,
 
         /* insert new ones above this line */
         AFTER_LAST_ERR_CODE