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rxrpc: switch rxrpc_send_data() to iov_iter primitives

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Convert skb_add_data() to iov_iter; allows to get rid of the explicit
messing with iovec in its only caller - skb_add_data() will keep advancing
->msg_iter for us, so there's no need to similate that manually.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-11-27 21:44:24 -05:00
parent 4c946d9c11
commit af2b040e47
2 changed files with 15 additions and 39 deletions
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11
include/linux/skbuff.h
View file

@ -2484,19 +2484,18 @@ static inline int skb_put_padto(struct sk_buff *skb, unsigned int len)
}
static inline int skb_add_data(struct sk_buff *skb,
char __user *from, int copy)
struct iov_iter *from, int copy)
{
const int off = skb->len;
if (skb->ip_summed == CHECKSUM_NONE) {
int err = 0;
__wsum csum = csum_and_copy_from_user(from, skb_put(skb, copy),
copy, 0, &err);
if (!err) {
__wsum csum = 0;
if (csum_and_copy_from_iter(skb_put(skb, copy), copy,
&csum, from) == copy) {
skb->csum = csum_block_add(skb->csum, csum, off);
return 0;
}
} else if (!copy_from_user(skb_put(skb, copy), from, copy))
} else if (copy_from_iter(skb_put(skb, copy), copy, from) == copy)
return 0;
__skb_trim(skb, off);

43
net/rxrpc/ar-output.c
View file

@ -529,13 +529,11 @@ static int rxrpc_send_data(struct kiocb *iocb,
struct msghdr *msg, size_t len)
{
struct rxrpc_skb_priv *sp;
unsigned char __user *from;
struct sk_buff *skb;
const struct iovec *iov;
struct sock *sk = &rx->sk;
long timeo;
bool more;
int ret, ioc, segment, copied;
int ret, copied;
timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
@ -545,25 +543,17 @@ static int rxrpc_send_data(struct kiocb *iocb,
if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN))
return -EPIPE;
iov = msg->msg_iter.iov;
ioc = msg->msg_iter.nr_segs - 1;
from = iov->iov_base;
segment = iov->iov_len;
iov++;
more = msg->msg_flags & MSG_MORE;
skb = call->tx_pending;
call->tx_pending = NULL;
copied = 0;
do {
if (len > iov_iter_count(&msg->msg_iter))
len = iov_iter_count(&msg->msg_iter);
while (len) {
int copy;
if (segment > len)
segment = len;
_debug("SEGMENT %d @%p", segment, from);
if (!skb) {
size_t size, chunk, max, space;
@ -631,13 +621,13 @@ static int rxrpc_send_data(struct kiocb *iocb,
/* append next segment of data to the current buffer */
copy = skb_tailroom(skb);
ASSERTCMP(copy, >, 0);
if (copy > segment)
copy = segment;
if (copy > len)
copy = len;
if (copy > sp->remain)
copy = sp->remain;
_debug("add");
ret = skb_add_data(skb, from, copy);
ret = skb_add_data(skb, &msg->msg_iter, copy);
_debug("added");
if (ret < 0)
goto efault;
@ -646,18 +636,6 @@ static int rxrpc_send_data(struct kiocb *iocb,
copied += copy;
len -= copy;
segment -= copy;
from += copy;
while (segment == 0 && ioc > 0) {
from = iov->iov_base;
segment = iov->iov_len;
iov++;
ioc--;
}
if (len == 0) {
segment = 0;
ioc = 0;
}
/* check for the far side aborting the call or a network error
* occurring */
@ -665,7 +643,7 @@ static int rxrpc_send_data(struct kiocb *iocb,
goto call_aborted;
/* add the packet to the send queue if it's now full */
if (sp->remain <= 0 || (segment == 0 && !more)) {
if (sp->remain <= 0 || (!len && !more)) {
struct rxrpc_connection *conn = call->conn;
uint32_t seq;
size_t pad;
@ -711,11 +689,10 @@ static int rxrpc_send_data(struct kiocb *iocb,
memcpy(skb->head, &sp->hdr,
sizeof(struct rxrpc_header));
rxrpc_queue_packet(call, skb, segment == 0 && !more);
rxrpc_queue_packet(call, skb, !iov_iter_count(&msg->msg_iter) && !more);
skb = NULL;
}
} while (segment > 0);
}
success:
ret = copied;