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Date: Sat, 11 Apr 2015 22:18:28 +0100
From: Al Viro <viro@...IV.linux.org.uk>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org
Subject: [PATCH 17/17] new helper: msg_data_left()
From: Al Viro <viro@...iv.linux.org.uk>
convert open-coded instances
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
crypto/algif_hash.c | 4 ++--
crypto/algif_skcipher.c | 4 ++--
drivers/vhost/net.c | 4 ++--
include/linux/socket.h | 5 +++++
net/core/datagram.c | 2 +-
net/ipv4/tcp.c | 8 ++++----
net/rxrpc/ar-output.c | 19 +++++++++----------
net/socket.c | 4 ++--
8 files changed, 27 insertions(+), 23 deletions(-)
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index 0a465e0..1396ad0 100644
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -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;
diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 8f903b6..9450752 100644
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -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;
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 18f05bf..7d137a4 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -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 !=
diff --git a/include/linux/socket.h b/include/linux/socket.h
index c9852ef..5bf59c8 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -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) */
diff --git a/net/core/datagram.c b/net/core/datagram.c
index df493d6..b80fb91 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -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))
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 094a682..18e3a12 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -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;
}
diff --git a/net/rxrpc/ar-output.c b/net/rxrpc/ar-output.c
index 7a31a39..c004280 100644
--- a/net/rxrpc/ar-output.c
+++ b/net/rxrpc/ar-output.c
@@ -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;
diff --git a/net/socket.c b/net/socket.c
index 21676e4..5b01262 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -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);
}
--
2.1.4
--
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