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 <eduma...@google.com>
---
include/linux/net.h | 1 +
net/socket.c | 9 +++++++++
2 files changed, 10 insertions(+)
diff --git a/include/linux/net.h b/include/linux/net.h
index
6554d3ba4396b3df49acac934ad16eeb71a695f4..5192bf502b11e42c3d9eb342ce67361916149bfa
100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -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,
diff --git a/net/socket.c b/net/socket.c
index
f10f1d947c78c193b49379b0ec641d81367fb4cf..75a5c2ebe57e0621dae17c6c9e1a796ee818b107
100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -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,
--
2.17.0.484.g0c8726318c-goog
