lustre lnet_sock_read(): switch to sock_recvmsg()

... and don't bother reinitializing msg.msg_iter

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/staging/lustre/lnet/lnet/lib-socket.c b/drivers/staging/lustre/lnet/lnet/lib-socket.c
index 539a264..984d768 100644 (file)
--- a/drivers/staging/lustre/lnet/lnet/lib-socket.c
+++ b/drivers/staging/lustre/lnet/lnet/lib-socket.c
@@ -318,19 +318,20 @@ lnet_sock_read(struct socket *sock, void *buffer, int nob, int timeout)
        long jiffies_left = timeout * msecs_to_jiffies(MSEC_PER_SEC);
        unsigned long then;
        struct timeval tv;
+       struct kvec  iov = {
+               .iov_base = buffer,
+               .iov_len  = nob
+       };
+       struct msghdr msg = {
+               .msg_flags = 0
+       };
 
        LASSERT(nob > 0);
        LASSERT(jiffies_left > 0);
 
-       for (;;) {
-               struct kvec  iov = {
-                       .iov_base = buffer,
-                       .iov_len  = nob
-               };
-               struct msghdr msg = {
-                       .msg_flags = 0
-               };
+       iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, &iov, 1, nob);
 
+       for (;;) {
                /* Set receive timeout to remaining time */
                jiffies_to_timeval(jiffies_left, &tv);
                rc = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO,
@@ -342,7 +343,7 @@ lnet_sock_read(struct socket *sock, void *buffer, int nob, int timeout)
                }
 
                then = jiffies;
-               rc = kernel_recvmsg(sock, &msg, &iov, 1, nob, 0);
+               rc = sock_recvmsg(sock, &msg, 0);
                jiffies_left -= jiffies - then;
 
                if (rc < 0)
@@ -351,10 +352,7 @@ lnet_sock_read(struct socket *sock, void *buffer, int nob, int timeout)
                if (!rc)
                        return -ECONNRESET;
 
-               buffer = ((char *)buffer) + rc;
-               nob -= rc;
-
-               if (!nob)
+               if (!msg_data_left(&msg))
                        return 0;
 
                if (jiffies_left <= 0)