drbd: Do not allow a fencing-policy of resource-and-stonith with protocol A

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 563a6ad..5288bd7 100644 (file)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -806,6 +806,15 @@ static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp
                goto fail;
        }
 
+       if (get_net_conf(mdev)) {
+               int prot = mdev->net_conf->wire_protocol;
+               put_net_conf(mdev);
+               if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) {
+                       retcode = ERR_STONITH_AND_PROT_A;
+                       goto fail;
+               }
+       }
+
        nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
        if (IS_ERR(nbc->lo_file)) {
                dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
@@ -1238,7 +1247,16 @@ static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
            && (new_conf->wire_protocol != DRBD_PROT_C)) {
                retcode = ERR_NOT_PROTO_C;
                goto fail;
-       };
+       }
+
+       if (get_ldev(mdev)) {
+               enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
+               put_ldev(mdev);
+               if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) {
+                       retcode = ERR_STONITH_AND_PROT_A;
+                       goto fail;
+               }
+       }
 
        if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
                retcode = ERR_DISCARD;

diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c
index 8259d4f..fbe0278 100644 (file)
--- a/drivers/block/drbd/drbd_req.c
+++ b/drivers/block/drbd/drbd_req.c
@@ -660,7 +660,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
 
        case resend:
                /* If RQ_NET_OK is already set, we got a P_WRITE_ACK or P_RECV_ACK
-                  before the connection loss; only P_BARRIER_ACK was missing.
+                  before the connection loss (B&C only); only P_BARRIER_ACK was missing.
                   Trowing them out of the TL here by pretending we got a BARRIER_ACK
                   TODO: Either resync them, or ensure peer was not rebooted. */
                if (!(req->rq_state & RQ_NET_OK)) {

diff --git a/include/linux/drbd.h b/include/linux/drbd.h
index 7be069f..0b2bfb5 100644 (file)
--- a/include/linux/drbd.h
+++ b/include/linux/drbd.h
@@ -145,6 +145,7 @@ enum drbd_ret_codes {
        ERR_CONNECTED           = 151, /* DRBD 8.3 only */
        ERR_PERM                = 152,
        ERR_NEED_APV_93         = 153,
+       ERR_STONITH_AND_PROT_A  = 154,
 
        /* insert new ones above this line */
        AFTER_LAST_ERR_CODE