struct rxrpc_conn_parameters *cp,
struct sockaddr_rxrpc *srx,
unsigned long user_call_ID,
s64 tx_total_len,
gfp_t gfp)
__releases(&rx->sk.sk_lock.slock)
{
struct rxrpc_call *call, *xcall;
struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
struct rb_node *parent, **pp;
const void *here = __builtin_return_address(0);
int ret;
_enter("%p,%lx", rx, user_call_ID);
call = rxrpc_alloc_client_call(srx, gfp);
if (IS_ERR(call)) {
release_sock(&rx->sk);
_leave(" = %ld", PTR_ERR(call));
return call;
}
call->tx_total_len = tx_total_len;
trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
here, (const void *)user_call_ID);
/* We need to protect a partially set up call against the user as we
* will be acting outside the socket lock.
*/
mutex_lock(&call->user_mutex);
/*
* set up a call for the given data
* - called in process context with IRQs enabled
*/
struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx,
struct rxrpc_transport *trans,
struct rxrpc_conn_bundle *bundle,
unsigned long user_call_ID,
int create,
gfp_t gfp)
{
struct rxrpc_call *call, *candidate;
struct rb_node *p, *parent, **pp;
_enter("%p,%d,%d,%lx,%d",
rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1,
user_call_ID, create);
/* search the extant calls first for one that matches the specified
* user ID */
read_lock(&rx->call_lock);
p = rx->calls.rb_node;
while (p) {
call = rb_entry(p, struct rxrpc_call, sock_node);
if (user_call_ID < call->user_call_ID)
p = p->rb_left;
else if (user_call_ID > call->user_call_ID)
p = p->rb_right;
else
goto found_extant_call;
}
read_unlock(&rx->call_lock);
if (!create || !trans)
return ERR_PTR(-EBADSLT);
/* not yet present - create a candidate for a new record and then
* redo the search */
candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp);
if (IS_ERR(candidate)) {
_leave(" = %ld", PTR_ERR(candidate));
return candidate;
}
candidate->user_call_ID = user_call_ID;
__set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags);
write_lock(&rx->call_lock);
pp = &rx->calls.rb_node;
parent = NULL;
while (*pp) {
parent = *pp;
call = rb_entry(parent, struct rxrpc_call, sock_node);
if (user_call_ID < call->user_call_ID)
pp = &(*pp)->rb_left;
else if (user_call_ID > call->user_call_ID)
pp = &(*pp)->rb_right;
else
goto found_extant_second;
}
/* second search also failed; add the new call */
call = candidate;
candidate = NULL;
rxrpc_get_call(call);
rb_link_node(&call->sock_node, parent, pp);
rb_insert_color(&call->sock_node, &rx->calls);
write_unlock(&rx->call_lock);
write_lock_bh(&rxrpc_call_lock);
list_add_tail(&call->link, &rxrpc_calls);
write_unlock_bh(&rxrpc_call_lock);
_net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
_leave(" = %p [new]", call);
return call;
/* we found the call in the list immediately */
found_extant_call:
rxrpc_get_call(call);
read_unlock(&rx->call_lock);
_leave(" = %p [extant %d]", call, atomic_read(&call->usage));
return call;
/* we found the call on the second time through the list */
found_extant_second:
rxrpc_get_call(call);
write_unlock(&rx->call_lock);
rxrpc_put_call(candidate);
_leave(" = %p [second %d]", call, atomic_read(&call->usage));
return call;
}
