[PATCH v3 net-next 1/3] net: socket: add support for async operations

[Tadeusz Struk]

Add support for async operations.

Signed-off-by: Tadeusz Struk <tadeusz.st...@intel.com>
---
 include/linux/socket.h |    1 +
 net/compat.c           |    2 ++
 net/socket.c           |    8 ++++++--
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/include/linux/socket.h b/include/linux/socket.h
index fab4d0d..c9852ef 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 4784431..7fb7ad1 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -72,6 +72,8 @@ 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 95d3085..fafc50a 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)
@@ -1890,6 +1892,8 @@ 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);

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