staging: lustre: ksocknal_lib_send_iov(): sendmsg doesn't bugger iovec...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib.c
index 77bb29f..8eb4a68 100644 (file)
--- a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib.c
+++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib.c
@@ -73,9 +73,9 @@ ksocknal_lib_zc_capable(struct ksock_conn *conn)
 int
 ksocknal_lib_send_iov(struct ksock_conn *conn, struct ksock_tx *tx)
 {
+       struct msghdr msg = {.msg_flags = MSG_DONTWAIT};
        struct socket *sock = conn->ksnc_sock;
-       int nob;
-       int rc;
+       int nob, i;
 
        if (*ksocknal_tunables.ksnd_enable_csum && /* checksum enabled */
            conn->ksnc_proto == &ksocknal_protocol_v2x && /* V2.x connection  */
@@ -83,34 +83,16 @@ ksocknal_lib_send_iov(struct ksock_conn *conn, struct ksock_tx *tx)
            !tx->tx_msg.ksm_csum)                    /* not checksummed  */
                ksocknal_lib_csum_tx(tx);
 
-       /*
-        * NB we can't trust socket ops to either consume our iovs
-        * or leave them alone.
-        */
-       {
-#if SOCKNAL_SINGLE_FRAG_TX
-               struct kvec scratch;
-               struct kvec *scratchiov = &scratch;
-               unsigned int niov = 1;
-#else
-               struct kvec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
-               unsigned int niov = tx->tx_niov;
-#endif
-               struct msghdr msg = {.msg_flags = MSG_DONTWAIT};
-               int i;
-
-               for (nob = i = 0; i < niov; i++) {
-                       scratchiov[i] = tx->tx_iov[i];
-                       nob += scratchiov[i].iov_len;
-               }
+       for (nob = i = 0; i < tx->tx_niov; i++)
+               nob += tx->tx_iov[i].iov_len;
 
-               if (!list_empty(&conn->ksnc_tx_queue) ||
-                   nob < tx->tx_resid)
-                       msg.msg_flags |= MSG_MORE;
+       if (!list_empty(&conn->ksnc_tx_queue) ||
+           nob < tx->tx_resid)
+               msg.msg_flags |= MSG_MORE;
 
-               rc = kernel_sendmsg(sock, &msg, scratchiov, niov, nob);
-       }
-       return rc;
+       iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC,
+                     tx->tx_iov, tx->tx_niov, nob);
+       return sock_sendmsg(sock, &msg);
 }
 
 int