drbd: Leave IO suspended if the fence handler find the peer primary

Actually we are clearing the susp_fen flag if we are not going
to call a fencing handler.

For setting the susp_fen flag needs to be edge-triggerd, and not
level triggered.

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

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 526414bc2cab18db5fb290189cccfa8951af4050..5ccbd7164c78c6c175f2f67286e2da1cf367b2dd 100644 (file)
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -426,6 +426,14 @@ static enum drbd_fencing_p highest_fencing_policy(struct drbd_connection *connec
        }
        rcu_read_unlock();
 
+       if (fp == FP_NOT_AVAIL) {
+               /* IO Suspending works on the whole resource.
+                  Do it only for one device. */
+               vnr = 0;
+               peer_device = idr_get_next(&connection->peer_devices, &vnr);
+               drbd_change_state(peer_device->device, CS_VERBOSE | CS_HARD, NS(susp_fen, 0));
+       }
+
        return fp;
 }
 

diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index 1a84345a3868b90e79425a7770884192b1e54b85..37966624656978dd0fe582f2485ff26a6d2dad20 100644 (file)
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -54,8 +54,8 @@ static void after_state_ch(struct drbd_device *device, union drbd_state os,
 static enum drbd_state_rv is_valid_state(struct drbd_device *, union drbd_state);
 static enum drbd_state_rv is_valid_soft_transition(union drbd_state, union drbd_state, struct drbd_connection *);
 static enum drbd_state_rv is_valid_transition(union drbd_state os, union drbd_state ns);
-static union drbd_state sanitize_state(struct drbd_device *device, union drbd_state ns,
-                                      enum sanitize_state_warnings *warn);
+static union drbd_state sanitize_state(struct drbd_device *device, union drbd_state os,
+                                      union drbd_state ns, enum sanitize_state_warnings *warn);
 
 static inline bool is_susp(union drbd_state s)
 {
@@ -287,7 +287,7 @@ _req_st_cond(struct drbd_device *device, union drbd_state mask,
 
        spin_lock_irqsave(&device->resource->req_lock, flags);
        os = drbd_read_state(device);
-       ns = sanitize_state(device, apply_mask_val(os, mask, val), NULL);
+       ns = sanitize_state(device, os, apply_mask_val(os, mask, val), NULL);
        rv = is_valid_transition(os, ns);
        if (rv >= SS_SUCCESS)
                rv = SS_UNKNOWN_ERROR;  /* cont waiting, otherwise fail. */
@@ -333,7 +333,7 @@ drbd_req_state(struct drbd_device *device, union drbd_state mask,
 
        spin_lock_irqsave(&device->resource->req_lock, flags);
        os = drbd_read_state(device);
-       ns = sanitize_state(device, apply_mask_val(os, mask, val), NULL);
+       ns = sanitize_state(device, os, apply_mask_val(os, mask, val), NULL);
        rv = is_valid_transition(os, ns);
        if (rv < SS_SUCCESS) {
                spin_unlock_irqrestore(&device->resource->req_lock, flags);
@@ -740,8 +740,8 @@ static void print_sanitize_warnings(struct drbd_device *device, enum sanitize_st
  * When we loose connection, we have to set the state of the peers disk (pdsk)
  * to D_UNKNOWN. This rule and many more along those lines are in this function.
  */
-static union drbd_state sanitize_state(struct drbd_device *device, union drbd_state ns,
-                                      enum sanitize_state_warnings *warn)
+static union drbd_state sanitize_state(struct drbd_device *device, union drbd_state os,
+                                      union drbd_state ns, enum sanitize_state_warnings *warn)
 {
        enum drbd_fencing_p fp;
        enum drbd_disk_state disk_min, disk_max, pdsk_min, pdsk_max;
@@ -882,11 +882,13 @@ static union drbd_state sanitize_state(struct drbd_device *device, union drbd_st
        }
 
        if (fp == FP_STONITH &&
-           (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED))
+           (ns.role == R_PRIMARY && ns.conn < C_CONNECTED && ns.pdsk > D_OUTDATED) &&
+           !(os.role == R_PRIMARY && os.conn < C_CONNECTED && os.pdsk > D_OUTDATED))
                ns.susp_fen = 1; /* Suspend IO while fence-peer handler runs (peer lost) */
 
        if (device->resource->res_opts.on_no_data == OND_SUSPEND_IO &&
-           (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE))
+           (ns.role == R_PRIMARY && ns.disk < D_UP_TO_DATE && ns.pdsk < D_UP_TO_DATE) &&
+           !(os.role == R_PRIMARY && os.disk < D_UP_TO_DATE && os.pdsk < D_UP_TO_DATE))
                ns.susp_nod = 1; /* Suspend IO while no data available (no accessible data available) */
 
        if (ns.aftr_isp || ns.peer_isp || ns.user_isp) {
@@ -958,7 +960,7 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,
 
        os = drbd_read_state(device);
 
-       ns = sanitize_state(device, ns, &ssw);
+       ns = sanitize_state(device, os, ns, &ssw);
        if (ns.i == os.i)
                return SS_NOTHING_TO_DO;
 
@@ -1656,7 +1658,7 @@ conn_is_valid_transition(struct drbd_connection *connection, union drbd_state ma
        idr_for_each_entry(&connection->peer_devices, peer_device, vnr) {
                struct drbd_device *device = peer_device->device;
                os = drbd_read_state(device);
-               ns = sanitize_state(device, apply_mask_val(os, mask, val), NULL);
+               ns = sanitize_state(device, os, apply_mask_val(os, mask, val), NULL);
 
                if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
                        ns.disk = os.disk;
@@ -1718,7 +1720,7 @@ conn_set_state(struct drbd_connection *connection, union drbd_state mask, union
                number_of_volumes++;
                os = drbd_read_state(device);
                ns = apply_mask_val(os, mask, val);
-               ns = sanitize_state(device, ns, NULL);
+               ns = sanitize_state(device, os, ns, NULL);
 
                if (flags & CS_IGN_OUTD_FAIL && ns.disk == D_OUTDATED && os.disk < D_OUTDATED)
                        ns.disk = os.disk;