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rxrpc: Support service upgrade from a kernel service

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Provide support for a kernel service to make use of the service upgrade
facility.  This involves:

 (1) Pass an upgrade request flag to rxrpc_kernel_begin_call().

 (2) Make rxrpc_kernel_recv_data() return the call's current service ID so
     that the caller can detect service upgrade and see what the service
     was upgraded to.

Signed-off-by: David Howells <[email protected]>
This commit is contained in:
David Howells 2017-10-18 11:36:39 +01:00
commit a68f4a27f5
6 changed files with 34 additions and 10 deletions
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5
net/rxrpc/af_rxrpc.c
View file

@ -265,6 +265,7 @@ static int rxrpc_listen(struct socket *sock, int backlog)
* @tx_total_len: Total length of data to transmit during the call (or -1)
* @gfp: The allocation constraints
* @notify_rx: Where to send notifications instead of socket queue
* @upgrade: Request service upgrade for call
*
* Allow a kernel service to begin a call on the nominated socket. This just
* sets up all the internal tracking structures and allocates connection and
@ -279,7 +280,8 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
unsigned long user_call_ID,
s64 tx_total_len,
gfp_t gfp,
rxrpc_notify_rx_t notify_rx)
rxrpc_notify_rx_t notify_rx,
bool upgrade)
{
struct rxrpc_conn_parameters cp;
struct rxrpc_call *call;
@ -304,6 +306,7 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
cp.key = key;
cp.security_level = 0;
cp.exclusive = false;
cp.upgrade = upgrade;
cp.service_id = srx->srx_service;
call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, tx_total_len,
gfp);

5
net/rxrpc/recvmsg.c
View file

@ -607,6 +607,7 @@ wait_error:
* @_offset: The running offset into the buffer.
* @want_more: True if more data is expected to be read
* @_abort: Where the abort code is stored if -ECONNABORTED is returned
* @_service: Where to store the actual service ID (may be upgraded)
*
* Allow a kernel service to receive data and pick up information about the
* state of a call. Returns 0 if got what was asked for and there's more
@ -624,7 +625,7 @@ wait_error:
*/
int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
void *buf, size_t size, size_t *_offset,
bool want_more, u32 *_abort)
bool want_more, u32 *_abort, u16 *_service)
{
struct iov_iter iter;
struct kvec iov;
@ -680,6 +681,8 @@ int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
read_phase_complete:
ret = 1;
out:
if (_service)
*_service = call->service_id;
mutex_unlock(&call->user_mutex);
_leave(" = %d [%zu,%d]", ret, *_offset, *_abort);
return ret;