net: socket: add support for async operations

Add support for async operations.

Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 9 insertions, 2 deletions

diff --git a/include/linux/socket.h b/include/linux/socket.h
index fab4d0ddf4ed..c9852ef7e317 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -51,6 +51,7 @@ struct msghdr {
         void            *msg_control;   /* ancillary data */
         __kernel_size_t msg_controllen; /* ancillary data buffer length */
         unsigned int    msg_flags;      /* flags on received message */
+        struct kiocb    *msg_iocb;      /* ptr to iocb for async requests */
 };
  
 struct user_msghdr {
diff --git a/net/compat.c b/net/compat.c
index 13c0c9a25cd9..c4b6b0f43d5d 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -79,6 +79,8 @@ ssize_t get_compat_msghdr(struct msghdr *kmsg,
         if (nr_segs > UIO_MAXIOV)
                 return -EMSGSIZE;
 
+        kmsg->msg_iocb = NULL;
+
         err = compat_rw_copy_check_uvector(save_addr ? READ : WRITE,
                                            compat_ptr(uiov), nr_segs,
                                            UIO_FASTIOV, *iov, iov);
diff --git a/net/socket.c b/net/socket.c
index 3e776776f42c..073809f4125f 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -798,7 +798,8 @@ static ssize_t sock_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
         struct file *file = iocb->ki_filp;
         struct socket *sock = file->private_data;
-        struct msghdr msg = {.msg_iter = *to};
+        struct msghdr msg = {.msg_iter = *to,
+                             .msg_iocb = iocb};
         ssize_t res;
 
         if (file->f_flags & O_NONBLOCK)
@@ -819,7 +820,8 @@ static ssize_t sock_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
         struct file *file = iocb->ki_filp;
         struct socket *sock = file->private_data;
-        struct msghdr msg = {.msg_iter = *from};
+        struct msghdr msg = {.msg_iter = *from,
+                             .msg_iocb = iocb};
         ssize_t res;
 
         if (iocb->ki_pos != 0)
@@ -1894,6 +1896,8 @@ static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
         if (nr_segs > UIO_MAXIOV)
                 return -EMSGSIZE;
 
+        kmsg->msg_iocb = NULL;
+
         err = rw_copy_check_uvector(save_addr ? READ : WRITE,
                                     uiov, nr_segs,
                                     UIO_FASTIOV, *iov, iov);