[PATCH 1/6] [net] drop 'size' argument of sock_recvmsg()

[Al Viro]

all callers have it equal to msg_data_left(msg).

Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
---
 drivers/target/iscsi/iscsi_target_util.c |  5 ++---
 include/linux/net.h                      |  3 +--
 net/socket.c                             | 23 ++++++++++-------------
 3 files changed, 13 insertions(+), 18 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target_util.c 
b/drivers/target/iscsi/iscsi_target_util.c
index 428b0d9..5772038 100644
--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -1283,9 +1283,8 @@ static int iscsit_do_rx_data(
        iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
                      count->iov, count->iov_count, data);
 
-       while (total_rx < data) {
-               rx_loop = sock_recvmsg(conn->sock, &msg,
-                                     (data - total_rx), MSG_WAITALL);
+       while (msg_data_left(&msg)) {
+               rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
                if (rx_loop <= 0) {
                        pr_debug("rx_loop: %d total_rx: %d\n",
                                rx_loop, total_rx);
diff --git a/include/linux/net.h b/include/linux/net.h
index 49175e4..72c1e06 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -218,8 +218,7 @@ int sock_create_lite(int family, int type, int proto, 
struct socket **res);
 struct socket *sock_alloc(void);
 void sock_release(struct socket *sock);
 int sock_sendmsg(struct socket *sock, struct msghdr *msg);
-int sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
-                int flags);
+int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags);
 struct file *sock_alloc_file(struct socket *sock, int flags, const char 
*dname);
 struct socket *sockfd_lookup(int fd, int *err);
 struct socket *sock_from_file(struct file *file, int *err);
diff --git a/net/socket.c b/net/socket.c
index 5f77a8e..956426e3 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -709,17 +709,16 @@ void __sock_recv_ts_and_drops(struct msghdr *msg, struct 
sock *sk,
 EXPORT_SYMBOL_GPL(__sock_recv_ts_and_drops);
 
 static inline int sock_recvmsg_nosec(struct socket *sock, struct msghdr *msg,
-                                    size_t size, int flags)
+                                    int flags)
 {
-       return sock->ops->recvmsg(sock, msg, size, flags);
+       return sock->ops->recvmsg(sock, msg, msg_data_left(msg), flags);
 }
 
-int sock_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
-                int flags)
+int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags)
 {
-       int err = security_socket_recvmsg(sock, msg, size, flags);
+       int err = security_socket_recvmsg(sock, msg, msg_data_left(msg), flags);
 
-       return err ?: sock_recvmsg_nosec(sock, msg, size, flags);
+       return err ?: sock_recvmsg_nosec(sock, msg, flags);
 }
 EXPORT_SYMBOL(sock_recvmsg);
 
@@ -746,7 +745,7 @@ int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 
        iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
        set_fs(KERNEL_DS);
-       result = sock_recvmsg(sock, msg, size, flags);
+       result = sock_recvmsg(sock, msg, flags);
        set_fs(oldfs);
        return result;
 }
@@ -796,7 +795,7 @@ static ssize_t sock_read_iter(struct kiocb *iocb, struct 
iov_iter *to)
        if (!iov_iter_count(to))        /* Match SYS5 behaviour */
                return 0;
 
-       res = sock_recvmsg(sock, &msg, iov_iter_count(to), msg.msg_flags);
+       res = sock_recvmsg(sock, &msg, msg.msg_flags);
        *to = msg.msg_iter;
        return res;
 }
@@ -1696,7 +1695,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, 
size_t, size,
        msg.msg_iocb = NULL;
        if (sock->file->f_flags & O_NONBLOCK)
                flags |= MSG_DONTWAIT;
-       err = sock_recvmsg(sock, &msg, iov_iter_count(&msg.msg_iter), flags);
+       err = sock_recvmsg(sock, &msg, flags);
 
        if (err >= 0 && addr != NULL) {
                err2 = move_addr_to_user(&address,
@@ -2073,7 +2072,7 @@ static int ___sys_recvmsg(struct socket *sock, struct 
user_msghdr __user *msg,
        struct iovec iovstack[UIO_FASTIOV];
        struct iovec *iov = iovstack;
        unsigned long cmsg_ptr;
-       int total_len, len;
+       int len;
        ssize_t err;
 
        /* kernel mode address */
@@ -2091,7 +2090,6 @@ static int ___sys_recvmsg(struct socket *sock, struct 
user_msghdr __user *msg,
                err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
        if (err < 0)
                return err;
-       total_len = iov_iter_count(&msg_sys->msg_iter);
 
        cmsg_ptr = (unsigned long)msg_sys->msg_control;
        msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
@@ -2101,8 +2099,7 @@ static int ___sys_recvmsg(struct socket *sock, struct 
user_msghdr __user *msg,
 
        if (sock->file->f_flags & O_NONBLOCK)
                flags |= MSG_DONTWAIT;
-       err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys,
-                                                         total_len, flags);
+       err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
        if (err < 0)
                goto out_freeiov;
        len = err;
-- 
2.8.0.rc3