@@ -181,6 +181,7 @@ struct proto_ops {
size_t total_len, int flags);
int (*mmap) (struct file *file, struct socket *sock,
struct vm_area_struct * vma);
+ int (*mmap_hook) (struct socket *sock, enum mmap_hook);
ssize_t (*sendpage) (struct socket *sock, struct page *page,
int offset, size_t size, int flags);
ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
@@ -131,6 +131,14 @@ static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags);
+static int sock_mmap_hook(struct file *file, enum mmap_hook mode)
+{
+ struct socket *sock = file->private_data;
+
+ if (!sock->ops->mmap_hook)
+ return 0;
+ return sock->ops->mmap_hook(sock, mode);
+}
/*
* Socket files have a set of 'special' operations as well as the generic file ones. These don't appear
* in the operation structures but are done directly via the socketcall() multiplexor.
@@ -147,6 +155,7 @@ static const struct file_operations socket_file_ops = {
.compat_ioctl = compat_sock_ioctl,
#endif
.mmap = sock_mmap,
+ .mmap_hook = sock_mmap_hook,
.release = sock_close,
.fasync = sock_fasync,
.sendpage = sock_sendpage,
sock_mmap_hook() is the mmap_hook handler provided for socket_file_ops Following patch will provide tcp_mmap_hook() for TCP protocol. Signed-off-by: Eric Dumazet <edumazet@google.com> --- include/linux/net.h | 1 + net/socket.c | 9 +++++++++ 2 files changed, 10 insertions(+)