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Subject[PATCH v21 072/100] c/r: introduce checkpoint/restore methods to struct proto_ops
This adds new 'proto_ops' function for checkpointing and restoring
sockets. This allows the checkpoint/restart code to compile nicely
when, e.g., AF_UNIX sockets are selected as a module.

It also adds a function 'collecting' a socket for leak-detection
during full-container checkpoint. This is useful for those sockets
that hold references to other "collectable" objects. Two examples are
AF_UNIX buffers which reference the socket of origin, and sockets that
have file descriptors in-transit.

Signed-off-by: Oren Laadan <>
Acked-by: Serge E. Hallyn <>
Tested-by: Serge E. Hallyn <>
include/linux/net.h | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/linux/net.h b/include/linux/net.h
index 4157b5d..1f32c70 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -153,6 +153,9 @@ struct sockaddr;
struct msghdr;
struct module;

+struct ckpt_ctx;
+struct ckpt_hdr_socket;
struct proto_ops {
int family;
struct module *owner;
@@ -201,6 +204,12 @@ struct proto_ops {
int offset, size_t size, int flags);
ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len, unsigned int flags);
+ int (*checkpoint)(struct ckpt_ctx *ctx,
+ struct socket *sock);
+ int (*collect)(struct ckpt_ctx *ctx,
+ struct socket *sock);
+ int (*restore)(struct ckpt_ctx *ctx, struct socket *sock,
+ struct ckpt_hdr_socket *h);

#define DECLARE_SOCKADDR(type, dst, src) \

 \ /
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