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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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28
fs/afs/rxrpc.c
View file

@ -346,7 +346,6 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
struct rxrpc_call *rxcall;
struct msghdr msg;
struct kvec iov[1];
size_t offset;
s64 tx_total_len;
int ret;
@ -433,10 +432,10 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
rxrpc_kernel_abort_call(call->net->socket, rxcall,
RX_USER_ABORT, ret, "KSD");
} else {
offset = 0;
rxrpc_kernel_recv_data(call->net->socket, rxcall, NULL,
0, &offset, false, &call->abort_code,
&call->service_id);
iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, NULL, 0, 0);
rxrpc_kernel_recv_data(call->net->socket, rxcall,
&msg.msg_iter, false,
&call->abort_code, &call->service_id);
ac->abort_code = call->abort_code;
ac->responded = true;
}
@ -467,13 +466,14 @@ static void afs_deliver_to_call(struct afs_call *call)
state == AFS_CALL_SV_AWAIT_ACK
) {
if (state == AFS_CALL_SV_AWAIT_ACK) {
size_t offset = 0;
struct iov_iter iter;
iov_iter_kvec(&iter, READ | ITER_KVEC, NULL, 0, 0);
ret = rxrpc_kernel_recv_data(call->net->socket,
call->rxcall,
NULL, 0, &offset, false,
call->rxcall, &iter, false,
&remote_abort,
&call->service_id);
trace_afs_recv_data(call, 0, offset, false, ret);
trace_afs_recv_data(call, 0, 0, false, ret);
if (ret == -EINPROGRESS || ret == -EAGAIN)
return;
@ -894,6 +894,8 @@ int afs_extract_data(struct afs_call *call, void *buf, size_t count,
bool want_more)
{
struct afs_net *net = call->net;
struct iov_iter iter;
struct kvec iov;
enum afs_call_state state;
u32 remote_abort = 0;
int ret;
@ -903,10 +905,14 @@ int afs_extract_data(struct afs_call *call, void *buf, size_t count,
ASSERTCMP(call->offset, <=, count);
ret = rxrpc_kernel_recv_data(net->socket, call->rxcall,
buf, count, &call->offset,
iov.iov_base = buf + call->offset;
iov.iov_len = count - call->offset;
iov_iter_kvec(&iter, ITER_KVEC | READ, &iov, 1, count - call->offset);
ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, &iter,
want_more, &remote_abort,
&call->service_id);
call->offset += (count - call->offset) - iov_iter_count(&iter);
trace_afs_recv_data(call, count, call->offset, want_more, ret);
if (ret == 0 || ret == -EAGAIN)
return ret;

2
include/net/af_rxrpc.h
View file

@ -61,7 +61,7 @@ int rxrpc_kernel_send_data(struct socket *, struct rxrpc_call *,
struct msghdr *, size_t,
rxrpc_notify_end_tx_t);
int rxrpc_kernel_recv_data(struct socket *, struct rxrpc_call *,
void *, size_t, size_t *, bool, u32 *, u16 *);
struct iov_iter *, bool, u32 *, u16 *);
bool rxrpc_kernel_abort_call(struct socket *, struct rxrpc_call *,
u32, int, const char *);
void rxrpc_kernel_end_call(struct socket *, struct rxrpc_call *);

33
net/rxrpc/recvmsg.c
View file

@ -611,9 +611,7 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
* 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 @@ int rxrpc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
* 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 @@ int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
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 @@ int rxrpc_kernel_recv_data(struct socket *sock, struct rxrpc_call *call,
ret = call->error;
if (call->completion == RXRPC_CALL_SUCCEEDED) {
ret = 1;
if (size > 0)
if (iov_iter_count(iter) > 0)
ret = -ECONNRESET;
}
goto out;