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Subject[PATCH 3/7] drbd: fix race between role change and handshake
Date
Symptoms:
If DRBD was "cleanly shut down" (all in sync, both Secondary before
disconnect, identical data generation uuids), and then one side was
promoted *during* the next connection handshake, the role change
could confuse the handshake.

The Primary would get stuck in WFBitmapS, the Secondary would log
unexpected cstate (Connected) in receive_bitmap
and get stuck in WFBitmapT.

Fix:
The test in is_valid_soft_transition wrong. It works because
the not allowed actions (promote/attach) do not touch the
cstate. The previous condition failed to demand a cstate change
in one clause.

In order to avoid deadlocks give up the state_mutex while waiting
for the transient state to go away.

Conflicts:
drbd/drbd_state.c
drbd/drbd_state.h
drbd/drbd_wrappers.h

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---
drivers/block/drbd/drbd_nl.c | 2 +-
drivers/block/drbd/drbd_state.c | 41 ++++++++++++++++++++++++++++++++++-------
drivers/block/drbd/drbd_state.h | 5 +++++
3 files changed, 40 insertions(+), 8 deletions(-)

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 4782d07..74df8cf 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -588,7 +588,7 @@ drbd_set_role(struct drbd_device *const device, enum drbd_role new_role, int for
val.i = 0; val.role = new_role;

while (try++ < max_tries) {
- rv = _drbd_request_state(device, mask, val, CS_WAIT_COMPLETE);
+ rv = _drbd_request_state_holding_state_mutex(device, mask, val, CS_WAIT_COMPLETE);

/* in case we first succeeded to outdate,
* but now suddenly could establish a connection */
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index 84b11f8..4529d92 100644
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -215,6 +215,18 @@ static bool no_peer_wf_report_params(struct drbd_connection *connection)
return rv;
}

+static void wake_up_all_devices(struct drbd_connection *connection)
+{
+ struct drbd_peer_device *peer_device;
+ int vnr;
+
+ rcu_read_lock();
+ idr_for_each_entry(&connection->peer_devices, peer_device, vnr)
+ wake_up(&peer_device->device->state_wait);
+ rcu_read_unlock();
+
+}
+

/**
* cl_wide_st_chg() - true if the state change is a cluster wide one
@@ -410,6 +422,22 @@ _drbd_request_state(struct drbd_device *device, union drbd_state mask,
return rv;
}

+enum drbd_state_rv
+_drbd_request_state_holding_state_mutex(struct drbd_device *device, union drbd_state mask,
+ union drbd_state val, enum chg_state_flags f)
+{
+ enum drbd_state_rv rv;
+
+ BUG_ON(f & CS_SERIALIZE);
+
+ wait_event_cmd(device->state_wait,
+ (rv = drbd_req_state(device, mask, val, f)) != SS_IN_TRANSIENT_STATE,
+ mutex_unlock(device->state_mutex),
+ mutex_lock(device->state_mutex));
+
+ return rv;
+}
+
static void print_st(struct drbd_device *device, const char *name, union drbd_state ns)
{
drbd_err(device, " %s = { cs:%s ro:%s/%s ds:%s/%s %c%c%c%c%c%c }\n",
@@ -629,14 +657,11 @@ is_valid_soft_transition(union drbd_state os, union drbd_state ns, struct drbd_c
if (ns.conn == C_DISCONNECTING && os.conn == C_UNCONNECTED)
rv = SS_IN_TRANSIENT_STATE;

- /* if (ns.conn == os.conn && ns.conn == C_WF_REPORT_PARAMS)
- rv = SS_IN_TRANSIENT_STATE; */
-
/* While establishing a connection only allow cstate to change.
- Delay/refuse role changes, detach attach etc... */
+ Delay/refuse role changes, detach attach etc... (they do not touch cstate) */
if (test_bit(STATE_SENT, &connection->flags) &&
- !(os.conn == C_WF_REPORT_PARAMS ||
- (ns.conn == C_WF_REPORT_PARAMS && os.conn == C_WF_CONNECTION)))
+ !((ns.conn == C_WF_REPORT_PARAMS && os.conn == C_WF_CONNECTION) ||
+ (ns.conn >= C_CONNECTED && os.conn == C_WF_REPORT_PARAMS)))
rv = SS_IN_TRANSIENT_STATE;

if ((ns.conn == C_VERIFY_S || ns.conn == C_VERIFY_T) && os.conn < C_CONNECTED)
@@ -1032,8 +1057,10 @@ __drbd_set_state(struct drbd_device *device, union drbd_state ns,

/* Wake up role changes, that were delayed because of connection establishing */
if (os.conn == C_WF_REPORT_PARAMS && ns.conn != C_WF_REPORT_PARAMS &&
- no_peer_wf_report_params(connection))
+ no_peer_wf_report_params(connection)) {
clear_bit(STATE_SENT, &connection->flags);
+ wake_up_all_devices(connection);
+ }

wake_up(&device->misc_wait);
wake_up(&device->state_wait);
diff --git a/drivers/block/drbd/drbd_state.h b/drivers/block/drbd/drbd_state.h
index cc41605..7f53c40 100644
--- a/drivers/block/drbd/drbd_state.h
+++ b/drivers/block/drbd/drbd_state.h
@@ -117,6 +117,11 @@ extern enum drbd_state_rv _drbd_request_state(struct drbd_device *,
union drbd_state,
union drbd_state,
enum chg_state_flags);
+
+extern enum drbd_state_rv
+_drbd_request_state_holding_state_mutex(struct drbd_device *, union drbd_state,
+ union drbd_state, enum chg_state_flags);
+
extern enum drbd_state_rv __drbd_set_state(struct drbd_device *, union drbd_state,
enum chg_state_flags,
struct completion *done);
--
1.9.1


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