drbd: Allow online change of replication protocol only with agreed_pv >= 100

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_nl.c b/drivers/block/drbd/drbd_nl.c
index 40de384..d4b29fd 100644 (file)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -1671,6 +1671,11 @@ check_net_options(struct drbd_tconn *tconn, struct net_conf *new_conf)
        struct drbd_conf *mdev;
        int i;
 
+       if (tconn->net_conf && tconn->agreed_pro_version < 100 &&
+           tconn->cstate == C_WF_REPORT_PARAMS &&
+           new_conf->wire_protocol != tconn->net_conf->wire_protocol)
+               return ERR_NEED_APV_100;
+
        if (new_conf->two_primaries &&
            (new_conf->wire_protocol != DRBD_PROT_C))
                return ERR_NOT_PROTO_C;

diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index fe8d6ba..6c7c85d 100644 (file)
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -160,6 +160,7 @@ enum drbd_ret_code {
        ERR_MINOR_CONFIGURED    = 160,
        ERR_MINOR_EXISTS        = 161,
        ERR_INVALID_REQUEST     = 162,
+       ERR_NEED_APV_100        = 163,
 
        /* insert new ones above this line */
        AFTER_LAST_ERR_CODE