linux-kernel - [C/R v20][PATCH 75/96] c/r: introduce checkpoint/restore methods to struct proto

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Message-Id: <1268842164-5590-76-git-send-email-orenl@cs.columbia.edu>
Date:	Wed, 17 Mar 2010 12:09:03 -0400
From:	Oren Laadan <orenl@...columbia.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-api@...r.kernel.org, Serge Hallyn <serue@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	containers@...ts.linux-foundation.org,
	Oren Laadan <orenl@...columbia.edu>
Subject: [C/R v20][PATCH 75/96] 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 <orenl@...columbia.edu>
Acked-by: Serge E. Hallyn <serue@...ibm.com>
Tested-by: Serge E. Hallyn <serue@...ibm.com>
---
 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 5e8083c..72a53b9 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;
@@ -197,6 +200,12 @@ 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)	\
-- 
1.6.3.3

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