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rxrpc: Calls should only have one terminal state

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Condense the terminal states of a call state machine to a single state,
plus a separate completion type value.  The value is then set, along with
error and abort code values, only when the call is transitioned to the
completion state.

Helpers are provided to simplify this.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2016-08-30 09:49:28 +01:00
parent ccbd3dbe85
commit f5c17aaeb2
12 changed files with 226 additions and 184 deletions
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43
net/rxrpc/call_object.c
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@@ -30,7 +30,7 @@ unsigned int rxrpc_max_call_lifetime = 60 * HZ;
unsigned int rxrpc_dead_call_expiry = 2 * HZ;
const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
[RXRPC_CALL_UNINITIALISED] = "Uninit",
[RXRPC_CALL_UNINITIALISED] = "Uninit ",
[RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
[RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
[RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
@@ -43,11 +43,16 @@ const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
[RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
[RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
[RXRPC_CALL_COMPLETE] = "Complete",
[RXRPC_CALL_DEAD] = "Dead ",
};
const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
[RXRPC_CALL_SUCCEEDED] = "Complete",
[RXRPC_CALL_SERVER_BUSY] = "SvBusy ",
[RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
[RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
[RXRPC_CALL_LOCAL_ERROR] = "LocError",
[RXRPC_CALL_NETWORK_ERROR] = "NetError",
[RXRPC_CALL_DEAD] = "Dead ",
};
struct kmem_cache *rxrpc_call_jar;
@@ -358,7 +363,7 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
_debug("CALL: %u { %s }",
call->debug_id, rxrpc_call_states[call->state]);
if (call->state >= RXRPC_CALL_COMPLETE) {
if (call->state == RXRPC_CALL_COMPLETE) {
__rxrpc_disconnect_call(conn, call);
} else {
spin_unlock(&conn->channel_lock);
@@ -472,8 +477,7 @@ void rxrpc_release_call(struct rxrpc_call *call)
if (call->state < RXRPC_CALL_COMPLETE &&
call->state != RXRPC_CALL_CLIENT_FINAL_ACK) {
_debug("+++ ABORTING STATE %d +++\n", call->state);
call->state = RXRPC_CALL_LOCALLY_ABORTED;
call->local_abort = RX_CALL_DEAD;
__rxrpc_abort_call(call, RX_CALL_DEAD, ECONNRESET);
}
write_unlock_bh(&call->state_lock);
@@ -538,20 +542,13 @@ static void rxrpc_mark_call_released(struct rxrpc_call *call)
write_lock(&call->state_lock);
if (call->state < RXRPC_CALL_DEAD) {
sched = false;
if (call->state < RXRPC_CALL_COMPLETE) {
_debug("abort call %p", call);
call->state = RXRPC_CALL_LOCALLY_ABORTED;
call->local_abort = RX_CALL_DEAD;
if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events))
sched = true;
}
sched = __rxrpc_abort_call(call, RX_CALL_DEAD, ECONNRESET);
if (!test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events))
sched = true;
if (sched)
rxrpc_queue_call(call);
}
write_unlock(&call->state_lock);
if (sched)
rxrpc_queue_call(call);
}
/*
@@ -749,16 +746,13 @@ static void rxrpc_call_life_expired(unsigned long _call)
{
struct rxrpc_call *call = (struct rxrpc_call *) _call;
_enter("{%d}", call->debug_id);
if (call->state >= RXRPC_CALL_COMPLETE)
return;
_enter("{%d}", call->debug_id);
read_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_COMPLETE) {
set_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events);
rxrpc_queue_call(call);
}
read_unlock_bh(&call->state_lock);
set_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events);
rxrpc_queue_call(call);
}
/*
@@ -791,9 +785,6 @@ static void rxrpc_ack_time_expired(unsigned long _call)
if (call->state >= RXRPC_CALL_COMPLETE)
return;
read_lock_bh(&call->state_lock);
if (call->state < RXRPC_CALL_COMPLETE &&
!test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events))
if (!test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events))
rxrpc_queue_call(call);
read_unlock_bh(&call->state_lock);
}