netdev - [PATCH v21 097/100] c/r: Add loopback checkpoint support (v2)

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Date:	Sat,  1 May 2010 10:16:19 -0400
From:	Oren Laadan <orenl@...columbia.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, Serge Hallyn <serue@...ibm.com>,
	Matt Helsley <matthltc@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Dan Smith <danms@...ibm.com>, netdev@...r.kernel.org
Subject: [PATCH v21 097/100] c/r: Add loopback checkpoint support (v2)

From: Dan Smith <danms@...ibm.com>

Adds a small ndo_checkpoint() handler for loopback devices to write the
name and addresses like other interfaces.

Changelog[v21]:
 - Unbreak compiling with CONFIG_CHECKPOINT=n or CONFIG_NET_NS=n

Changes in v2:
 - Add CONFIG_CHECKPOINT around the handler

Cc: netdev@...r.kernel.org
Signed-off-by: Dan Smith <danms@...ibm.com>
Acked-by: David S. Miller <davem@...emloft.net>
Acked-by: Serge Hallyn <serue@...ibm.com>
Acked-by: Oren Laadan <orenl@...columbia.edu>
---
 drivers/net/loopback.c |   45 ++++++++++++++++++++++++++++++++++++++++++---
 1 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 72b7949..9a958a8 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -155,10 +155,49 @@ static void loopback_dev_free(struct net_device *dev)
 	free_netdev(dev);
 }
 
+#ifdef CONFIG_NETNS_CHECKPOINT
+#include <linux/checkpoint.h>
+#include <linux/checkpoint_hdr.h>
+
+static int loopback_checkpoint(struct ckpt_ctx *ctx, struct net_device *dev)
+{
+	struct ckpt_hdr_netdev *h;
+	struct ckpt_netdev_addr *addrs;
+	int ret;
+
+	h = ckpt_netdev_base(ctx, dev, &addrs);
+	if (IS_ERR(h))
+		return PTR_ERR(h);
+
+	h->type = CKPT_NETDEV_LO;
+
+	ret = ckpt_write_obj(ctx, (struct ckpt_hdr *)h);
+	if (ret < 0)
+		goto out;
+
+	ret = ckpt_write_buffer(ctx, dev->name, IFNAMSIZ);
+	if (ret < 0)
+		goto out;
+
+	if (h->inet_addrs > 0) {
+		int len = (sizeof(struct ckpt_netdev_addr) * h->inet_addrs);
+		ret = ckpt_write_buffer(ctx, addrs, len);
+	}
+
+ out:
+	ckpt_hdr_put(ctx, h);
+	kfree(addrs);
+
+	return ret;
+}
+#endif
 static const struct net_device_ops loopback_ops = {
-	.ndo_init      = loopback_dev_init,
-	.ndo_start_xmit= loopback_xmit,
-	.ndo_get_stats = loopback_get_stats,
+	.ndo_init       = loopback_dev_init,
+	.ndo_start_xmit = loopback_xmit,
+	.ndo_get_stats  = loopback_get_stats,
+#ifdef CONFIG_NETNS_CHECKPOINT
+	.ndo_checkpoint = loopback_checkpoint,
+#endif
 };
 
 /*
-- 
1.6.3.3

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