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rxrpc: Push iov_iter up from rxrpc_kernel_recv_data() to caller

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Push iov_iter up from rxrpc_kernel_recv_data() to its caller to allow
non-contiguous iovs to be passed down, thereby permitting file reading to
be simplified in the AFS filesystem in a future patch.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Howells
2018-08-03 17:06:56 +01:00
committed by David S. Miller
parent 3424b70022
commit eb9950eb31
3 changed files with 29 additions and 34 deletions
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33
net/rxrpc/recvmsg.c
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@@ -611,9 +611,7 @@ wait_error:
* rxrpc_kernel_recv_data - Allow a kernel service to receive data/info
* @sock: The socket that the call exists on
* @call: The call to send data through
* @buf: The buffer to receive into
* @size: The size of the buffer, including data already read
* @_offset: The running offset into the buffer.
* @iter: The buffer to receive into
* @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)
@@ -626,39 +624,30 @@ wait_error:
* Note that we may return -EAGAIN to drain empty packets at the end of the
* data, even if we've already copied over the requested data.
*
* This function adds the amount it transfers to *_offset, so this should be
* precleared as appropriate. Note that the amount remaining in the buffer is
* taken to be size - *_offset.
*
* *_abort should also be initialised to 0.
*/
int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
void *buf, size_t size, size_t *_offset,
struct iov_iter *iter,
bool want_more, u32 *_abort, u16 *_service)
{
struct iov_iter iter;
struct kvec iov;
size_t offset = 0;
int ret;
_enter("{%d,%s},%zu/%zu,%d",
_enter("{%d,%s},%zu,%d",
call->debug_id, rxrpc_call_states[call->state],
*_offset, size, want_more);
iov_iter_count(iter), want_more);
ASSERTCMP(*_offset, <=, size);
ASSERTCMP(call->state, !=, RXRPC_CALL_SERVER_ACCEPTING);
iov.iov_base = buf + *_offset;
iov.iov_len = size - *_offset;
iov_iter_kvec(&iter, ITER_KVEC | READ, &iov, 1, size - *_offset);
mutex_lock(&call->user_mutex);
switch (READ_ONCE(call->state)) {
case RXRPC_CALL_CLIENT_RECV_REPLY:
case RXRPC_CALL_SERVER_RECV_REQUEST:
case RXRPC_CALL_SERVER_ACK_REQUEST:
ret = rxrpc_recvmsg_data(sock, call, NULL, &iter, size, 0,
_offset);
ret = rxrpc_recvmsg_data(sock, call, NULL, iter,
iov_iter_count(iter), 0,
&offset);
if (ret < 0)
goto out;
@@ -667,7 +656,7 @@ int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
* full buffer or have been given -EAGAIN.
*/
if (ret == 1) {
if (*_offset < size)
if (iov_iter_count(iter) > 0)
goto short_data;
if (!want_more)
goto read_phase_complete;
@@ -704,7 +693,7 @@ out:
if (_service)
*_service = call->service_id;
mutex_unlock(&call->user_mutex);
_leave(" = %d [%zu,%d]", ret, *_offset, *_abort);
_leave(" = %d [%zu,%d]", ret, iov_iter_count(iter), *_abort);
return ret;
short_data:
@@ -720,7 +709,7 @@ call_complete:
ret = call->error;
if (call->completion == RXRPC_CALL_SUCCEEDED) {
ret = 1;
if (size > 0)
if (iov_iter_count(iter) > 0)
ret = -ECONNRESET;
}
goto out;