/*
* perform processing on an asynchronous call
* - on a multiple-thread workqueue this work item may try to run on several
* CPUs at the same time
*/
static void afs_process_async_call(struct work_struct *work)
{
struct afs_call *call =
container_of(work, struct afs_call, async_work);
_enter("");
if (!skb_queue_empty(&call->rx_queue))
afs_deliver_to_call(call);
if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) {
if (call->wait_mode->async_complete)
call->wait_mode->async_complete(call->reply,
call->error);
call->reply = NULL;
/* kill the call */
rxrpc_kernel_end_call(call->rxcall);
call->rxcall = NULL;
if (call->type->destructor)
call->type->destructor(call);
/* we can't just delete the call because the work item may be
* queued */
call->async_workfn = afs_delete_async_call;
queue_work(afs_async_calls, &call->async_work);
}
_leave("");
}
/*
* Perform I/O processing on an asynchronous call. The work item carries a ref
* to the call struct that we either need to release or to pass on.
*/
static void afs_process_async_call(struct work_struct *work)
{
struct afs_call *call = container_of(work, struct afs_call, async_work);
_enter("");
if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
call->need_attention = false;
afs_deliver_to_call(call);
}
if (call->state == AFS_CALL_COMPLETE) {
call->reply[0] = NULL;
/* We have two refs to release - one from the alloc and one
* queued with the work item - and we can't just deallocate the
* call because the work item may be queued again.
*/
call->async_work.func = afs_delete_async_call;
if (!queue_work(afs_async_calls, &call->async_work))
afs_put_call(call);
}
afs_put_call(call);
_leave("");
}
/*
* wait synchronously for a call to complete
*/
static int afs_wait_for_call_to_complete(struct afs_call *call)
{
struct sk_buff *skb;
int ret;
DECLARE_WAITQUEUE(myself, current);
_enter("");
add_wait_queue(&call->waitq, &myself);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
/* deliver any messages that are in the queue */
if (!skb_queue_empty(&call->rx_queue)) {
__set_current_state(TASK_RUNNING);
afs_deliver_to_call(call);
continue;
}
ret = call->error;
if (call->state >= AFS_CALL_COMPLETE)
break;
ret = -EINTR;
if (signal_pending(current))
break;
schedule();
}
remove_wait_queue(&call->waitq, &myself);
__set_current_state(TASK_RUNNING);
/* kill the call */
if (call->state < AFS_CALL_COMPLETE) {
_debug("call incomplete");
rxrpc_kernel_abort_call(call->rxcall, RX_CALL_DEAD);
while ((skb = skb_dequeue(&call->rx_queue)))
afs_free_skb(skb);
}
_debug("call complete");
rxrpc_kernel_end_call(call->rxcall);
call->rxcall = NULL;
call->type->destructor(call);
afs_free_call(call);
_leave(" = %d", ret);
return ret;
}
/*
* perform processing on an asynchronous call
* - on a multiple-thread workqueue this work item may try to run on several
* CPUs at the same time
*/
static void afs_process_async_call(struct afs_call *call)
{
_enter("");
if (!skb_queue_empty(&call->rx_queue))
afs_deliver_to_call(call);
if (call->state >= AFS_CALL_COMPLETE && call->wait_mode) {
if (call->wait_mode->async_complete)
call->wait_mode->async_complete(call->reply,
call->error);
call->reply = NULL;
/* kill the call */
afs_end_call_nofree(call);
/* we can't just delete the call because the work item may be
* queued */
call->async_workfn = afs_delete_async_call;
queue_work(afs_async_calls, &call->async_work);
}
_leave("");
}
/*
* wait synchronously for a call to complete
*/
static long afs_wait_for_call_to_complete(struct afs_call *call,
struct afs_addr_cursor *ac)
{
signed long rtt2, timeout;
long ret;
u64 rtt;
u32 life, last_life;
DECLARE_WAITQUEUE(myself, current);
_enter("");
rtt = rxrpc_kernel_get_rtt(call->net->socket, call->rxcall);
rtt2 = nsecs_to_jiffies64(rtt) * 2;
if (rtt2 < 2)
rtt2 = 2;
timeout = rtt2;
last_life = rxrpc_kernel_check_life(call->net->socket, call->rxcall);
add_wait_queue(&call->waitq, &myself);
for (;;) {
set_current_state(TASK_UNINTERRUPTIBLE);
/* deliver any messages that are in the queue */
if (!afs_check_call_state(call, AFS_CALL_COMPLETE) &&
call->need_attention) {
call->need_attention = false;
__set_current_state(TASK_RUNNING);
afs_deliver_to_call(call);
continue;
}
if (afs_check_call_state(call, AFS_CALL_COMPLETE))
break;
life = rxrpc_kernel_check_life(call->net->socket, call->rxcall);
if (timeout == 0 &&
life == last_life && signal_pending(current))
break;
if (life != last_life) {
timeout = rtt2;
last_life = life;
}
timeout = schedule_timeout(timeout);
}
remove_wait_queue(&call->waitq, &myself);
__set_current_state(TASK_RUNNING);
/* Kill off the call if it's still live. */
if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
_debug("call interrupted");
if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
RX_USER_ABORT, -EINTR, "KWI"))
afs_set_call_complete(call, -EINTR, 0);
}
spin_lock_bh(&call->state_lock);
ac->abort_code = call->abort_code;
ac->error = call->error;
spin_unlock_bh(&call->state_lock);
ret = ac->error;
switch (ret) {
case 0:
if (call->ret_reply0) {
ret = (long)call->reply[0];
call->reply[0] = NULL;
}
/* Fall through */
case -ECONNABORTED:
ac->responded = true;
break;
}
_debug("call complete");
afs_put_call(call);
_leave(" = %p", (void *)ret);
return ret;
}
