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new helper: msg_data_left()

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convert open-coded instances

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-12-15 21:39:31 -05:00
commit 01e97e6517
8 changed files with 27 additions and 23 deletions
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4
crypto/algif_hash.c
View file

@ -56,8 +56,8 @@ static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
ctx->more = 0;
while (iov_iter_count(&msg->msg_iter)) {
int len = iov_iter_count(&msg->msg_iter);
while (msg_data_left(msg)) {
int len = msg_data_left(msg);
if (len > limit)
len = limit;

4
crypto/algif_skcipher.c
View file

@ -641,7 +641,7 @@ static int skcipher_recvmsg_sync(struct socket *sock, struct msghdr *msg,
long copied = 0;
lock_sock(sk);
while (iov_iter_count(&msg->msg_iter)) {
while (msg_data_left(msg)) {
sgl = list_first_entry(&ctx->tsgl,
struct skcipher_sg_list, list);
sg = sgl->sg;
@ -655,7 +655,7 @@ static int skcipher_recvmsg_sync(struct socket *sock, struct msghdr *msg,
goto unlock;
}
used = min_t(unsigned long, ctx->used, iov_iter_count(&msg->msg_iter));
used = min_t(unsigned long, ctx->used, msg_data_left(msg));
used = af_alg_make_sg(&ctx->rsgl, &msg->msg_iter, used);
err = used;

4
drivers/vhost/net.c
View file

@ -357,13 +357,13 @@ static void handle_tx(struct vhost_net *net)
iov_iter_init(&msg.msg_iter, WRITE, vq->iov, out, len);
iov_iter_advance(&msg.msg_iter, hdr_size);
/* Sanity check */
if (!iov_iter_count(&msg.msg_iter)) {
if (!msg_data_left(&msg)) {
vq_err(vq, "Unexpected header len for TX: "
"%zd expected %zd\n",
len, hdr_size);
break;
}
len = iov_iter_count(&msg.msg_iter);
len = msg_data_left(&msg);
zcopy_used = zcopy && len >= VHOST_GOODCOPY_LEN
&& (nvq->upend_idx + 1) % UIO_MAXIOV !=

5
include/linux/socket.h
View file

@ -139,6 +139,11 @@ static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr
return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
}
static inline size_t msg_data_left(struct msghdr *msg)
{
return iov_iter_count(&msg->msg_iter);
}
/* "Socket"-level control message types: */
#define SCM_RIGHTS 0x01 /* rw: access rights (array of int) */

2
net/core/datagram.c
View file

@ -673,7 +673,7 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb,
if (!chunk)
return 0;
if (iov_iter_count(&msg->msg_iter) < chunk) {
if (msg_data_left(msg) < chunk) {
if (__skb_checksum_complete(skb))
goto csum_error;
if (skb_copy_datagram_msg(skb, hlen, msg, chunk))

8
net/ipv4/tcp.c
View file

@ -1119,7 +1119,7 @@ int tcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
sg = !!(sk->sk_route_caps & NETIF_F_SG);
while (iov_iter_count(&msg->msg_iter)) {
while (msg_data_left(msg)) {
int copy = 0;
int max = size_goal;
@ -1163,8 +1163,8 @@ new_segment:
}
/* Try to append data to the end of skb. */
if (copy > iov_iter_count(&msg->msg_iter))
copy = iov_iter_count(&msg->msg_iter);
if (copy > msg_data_left(msg))
copy = msg_data_left(msg);
/* Where to copy to? */
if (skb_availroom(skb) > 0) {
@ -1221,7 +1221,7 @@ new_segment:
tcp_skb_pcount_set(skb, 0);
copied += copy;
if (!iov_iter_count(&msg->msg_iter)) {
if (!msg_data_left(msg)) {
tcp_tx_timestamp(sk, skb);
goto out;
}

19
net/rxrpc/ar-output.c
View file

@ -564,8 +564,8 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
max &= ~(call->conn->size_align - 1UL);
chunk = max;
if (chunk > iov_iter_count(&msg->msg_iter) && !more)
chunk = iov_iter_count(&msg->msg_iter);
if (chunk > msg_data_left(msg) && !more)
chunk = msg_data_left(msg);
space = chunk + call->conn->size_align;
space &= ~(call->conn->size_align - 1UL);
@ -608,11 +608,11 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
sp = rxrpc_skb(skb);
/* append next segment of data to the current buffer */
if (iov_iter_count(&msg->msg_iter) > 0) {
if (msg_data_left(msg) > 0) {
int copy = skb_tailroom(skb);
ASSERTCMP(copy, >, 0);
if (copy > iov_iter_count(&msg->msg_iter))
copy = iov_iter_count(&msg->msg_iter);
if (copy > msg_data_left(msg))
copy = msg_data_left(msg);
if (copy > sp->remain)
copy = sp->remain;
@ -633,7 +633,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
/* add the packet to the send queue if it's now full */
if (sp->remain <= 0 ||
(iov_iter_count(&msg->msg_iter) == 0 && !more)) {
(msg_data_left(msg) == 0 && !more)) {
struct rxrpc_connection *conn = call->conn;
uint32_t seq;
size_t pad;
@ -663,7 +663,7 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
sp->hdr.serviceId = conn->service_id;
sp->hdr.flags = conn->out_clientflag;
if (iov_iter_count(&msg->msg_iter) == 0 && !more)
if (msg_data_left(msg) == 0 && !more)
sp->hdr.flags |= RXRPC_LAST_PACKET;
else if (CIRC_SPACE(call->acks_head, call->acks_tail,
call->acks_winsz) > 1)
@ -679,11 +679,10 @@ static int rxrpc_send_data(struct rxrpc_sock *rx,
memcpy(skb->head, &sp->hdr,
sizeof(struct rxrpc_header));
rxrpc_queue_packet(call, skb,
iov_iter_count(&msg->msg_iter) == 0 && !more);
rxrpc_queue_packet(call, skb, !msg_data_left(msg) && !more);
skb = NULL;
}
} while (iov_iter_count(&msg->msg_iter) > 0);
} while (msg_data_left(msg) > 0);
success:
ret = copied;

4
net/socket.c
View file

@ -612,7 +612,7 @@ EXPORT_SYMBOL(__sock_tx_timestamp);
static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
{
int ret = sock->ops->sendmsg(sock, msg, iov_iter_count(&msg->msg_iter));
int ret = sock->ops->sendmsg(sock, msg, msg_data_left(msg));
BUG_ON(ret == -EIOCBQUEUED);
return ret;
}
@ -620,7 +620,7 @@ static inline int sock_sendmsg_nosec(struct socket *sock, struct msghdr *msg)
int sock_sendmsg(struct socket *sock, struct msghdr *msg)
{
int err = security_socket_sendmsg(sock, msg,
iov_iter_count(&msg->msg_iter));
msg_data_left(msg));
return err ?: sock_sendmsg_nosec(sock, msg);
}