[Devel] [PATCH 31/38] C/R: formally checkpoint/restore struct net_namespace
Alexey Dobriyan
adobriyan at gmail.com
Thu May 21 21:55:25 PDT 2009
Signed-off-by: Alexey Dobriyan <adobriyan at gmail.com>
---
include/linux/kstate-image.h | 6 ++
include/linux/kstate.h | 19 +++++++
include/net/net_namespace.h | 1 +
kernel/kstate/cpt-sys.c | 6 ++
kernel/kstate/kstate-context.c | 8 +++
kernel/kstate/kstate-object.c | 6 ++
kernel/nsproxy.c | 66 +++++++++++++++++++++++---
net/core/net_namespace.c | 102 +++++++++++++++++++++++++++++++++++++++-
8 files changed, 205 insertions(+), 9 deletions(-)
diff --git a/include/linux/kstate-image.h b/include/linux/kstate-image.h
index 64328e1..8119f2b 100644
--- a/include/linux/kstate-image.h
+++ b/include/linux/kstate-image.h
@@ -48,6 +48,7 @@ struct kstate_image_header {
#define KSTATE_OBJ_IPC_NS 8
#define KSTATE_OBJ_MNT_NS 9
#define KSTATE_OBJ_PID_NS 10
+#define KSTATE_OBJ_NET_NS 11
struct kstate_object_header {
__u32 obj_type;
@@ -217,6 +218,7 @@ struct kstate_image_nsproxy {
kstate_ref_t ref_ipc_ns; /* KSTATE_REF_UNDEF if IPC_NS=n */
kstate_ref_t ref_mnt_ns;
kstate_ref_t ref_pid_ns;
+ kstate_ref_t ref_net_ns; /* KSTATE_REF_UNDEF if NET_NS=n */
} __packed;
struct kstate_image_uts_ns {
@@ -244,4 +246,8 @@ struct kstate_image_pid_ns {
kstate_ref_t ref_parent; /* KSTATE_REF_UNDEF if root pid_ns */
__u32 last_pid;
} __packed;
+
+struct kstate_image_net_ns {
+ struct kstate_object_header hdr;
+} __packed;
#endif
diff --git a/include/linux/kstate.h b/include/linux/kstate.h
index c925cef..a2bea1a 100644
--- a/include/linux/kstate.h
+++ b/include/linux/kstate.h
@@ -27,6 +27,9 @@ enum kstate_context_obj_type {
#endif
KSTATE_CTX_MM_STRUCT,
KSTATE_CTX_MNT_NS,
+#ifdef CONFIG_NET_NS
+ KSTATE_CTX_NET_NS,
+#endif
KSTATE_CTX_NSPROXY,
KSTATE_CTX_PID_NS,
KSTATE_CTX_TASK_STRUCT,
@@ -105,6 +108,22 @@ int kstate_collect_all_pid_ns(struct kstate_context *ctx);
int kstate_dump_all_pid_ns(struct kstate_context *ctx);
int kstate_restore_pid_ns(struct kstate_context *ctx, kstate_ref_t *ref);
+#ifdef CONFIG_NET_NS
+int kstate_collect_all_net_ns(struct kstate_context *ctx);
+int kstate_dump_all_net_ns(struct kstate_context *ctx);
+int kstate_restore_net_ns(struct kstate_context *ctx, kstate_ref_t *ref);
+#else
+static inline int kstate_collect_all_net_ns(struct kstate_context *ctx)
+{
+ return 0;
+}
+
+static inline int kstate_dump_all_net_ns(struct kstate_context *ctx)
+{
+ return 0;
+}
+#endif
+
#if defined(CONFIG_X86_32) || defined(CONFIG_X86_64)
extern const __u32 kstate_kernel_arch;
int kstate_arch_check_image_header(struct kstate_image_header *i);
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index ded434b..a48e765 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -107,6 +107,7 @@ static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
extern struct list_head net_namespace_list;
#ifdef CONFIG_NET_NS
+extern struct net *net_create(void);
extern void __put_net(struct net *net);
static inline struct net *get_net(struct net *net)
diff --git a/kernel/kstate/cpt-sys.c b/kernel/kstate/cpt-sys.c
index cbaf038..620998a 100644
--- a/kernel/kstate/cpt-sys.c
+++ b/kernel/kstate/cpt-sys.c
@@ -80,6 +80,9 @@ static int kstate_collect(struct kstate_context *ctx)
rv = kstate_collect_all_pid_ns(ctx);
if (rv < 0)
return rv;
+ rv = kstate_collect_all_net_ns(ctx);
+ if (rv < 0)
+ return rv;
rv = kstate_collect_all_mm_struct(ctx);
if (rv < 0)
return rv;
@@ -145,6 +148,9 @@ static int kstate_dump(struct kstate_context *ctx)
rv = kstate_dump_all_mm_struct(ctx);
if (rv < 0)
return rv;
+ rv = kstate_dump_all_net_ns(ctx);
+ if (rv < 0)
+ return rv;
rv = kstate_dump_all_mnt_ns(ctx);
if (rv < 0)
return rv;
diff --git a/kernel/kstate/kstate-context.c b/kernel/kstate/kstate-context.c
index 7cd1f45..423b45b 100644
--- a/kernel/kstate/kstate-context.c
+++ b/kernel/kstate/kstate-context.c
@@ -8,6 +8,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/utsname.h>
+#include <net/net_namespace.h>
#include <linux/kstate.h>
@@ -57,6 +58,13 @@ void kstate_context_destroy(struct kstate_context *ctx)
list_del(&obj->o_list);
kfree(obj);
}
+#ifdef CONFIG_NET_NS
+ for_each_kstate_object_safe(ctx, obj, tmp, KSTATE_CTX_NET_NS) {
+ put_net((struct net *)obj->o_obj);
+ list_del(&obj->o_list);
+ kfree(obj);
+ }
+#endif
for_each_kstate_object_safe(ctx, obj, tmp, KSTATE_CTX_NSPROXY) {
put_nsproxy((struct nsproxy *)obj->o_obj);
list_del(&obj->o_list);
diff --git a/kernel/kstate/kstate-object.c b/kernel/kstate/kstate-object.c
index 13bb75c..d9b36fa 100644
--- a/kernel/kstate/kstate-object.c
+++ b/kernel/kstate/kstate-object.c
@@ -8,6 +8,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/utsname.h>
+#include <net/net_namespace.h>
#include <linux/kstate.h>
#include <linux/kstate-image.h>
@@ -48,6 +49,11 @@ int kstate_collect_object(struct kstate_context *ctx, void *p, enum kstate_conte
case KSTATE_CTX_MNT_NS:
get_mnt_ns((struct mnt_namespace *)obj->o_obj);
break;
+#ifdef CONFIG_NET_NS
+ case KSTATE_CTX_NET_NS:
+ get_net((struct net *)obj->o_obj);
+ break;
+#endif
case KSTATE_CTX_NSPROXY:
get_nsproxy((struct nsproxy *)obj->o_obj);
break;
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 0b1f66d..85c6677 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -290,6 +290,12 @@ static int dump_nsproxy(struct kstate_context *ctx, struct kstate_object *obj)
i->ref_mnt_ns = tmp->o_ref;
tmp = find_kstate_obj_by_ptr(ctx, nsproxy->pid_ns, KSTATE_CTX_PID_NS);
i->ref_pid_ns = tmp->o_ref;
+#ifdef CONFIG_NET_NS
+ tmp = find_kstate_obj_by_ptr(ctx, nsproxy->net_ns, KSTATE_CTX_NET_NS);
+ i->ref_net_ns = tmp->o_ref;
+#else
+ i->ref_net_ns = KSTATE_REF_UNDEF;
+#endif
rv = kstate_write_image(ctx, i, sizeof(*i), obj);
kfree(i);
@@ -408,13 +414,57 @@ static int restore_pid_ns(struct kstate_context *ctx, kstate_ref_t *ref, struct
return 0;
}
+#ifdef CONFIG_NET_NS
+static int restore_net_ns(struct kstate_context *ctx, kstate_ref_t *ref, struct nsproxy *nsproxy)
+{
+ struct net *net_ns;
+ struct kstate_object *tmp;
+ int rv;
+
+ if (kstate_ref_undefined(ref)) {
+ /*
+ * NET_NS=n => NET_NS=y case: hope nobody is crazy enough
+ * to depend on NET_NS absence.
+ */
+ net_ns = net_create();
+ if (IS_ERR(net_ns))
+ return PTR_ERR(net_ns);
+ rv = kstate_restore_object(ctx, net_ns, KSTATE_CTX_NET_NS, ref);
+ if (rv < 0) {
+ put_net(net_ns);
+ return rv;
+ }
+ nsproxy->net_ns = net_ns;
+ return 0;
+ }
+ /* NET_NS=y => NET_NS=y case. */
+ tmp = find_kstate_obj_by_ref(ctx, ref, KSTATE_CTX_NET_NS);
+ if (!tmp) {
+ rv = kstate_restore_net_ns(ctx, ref);
+ if (rv < 0)
+ return rv;
+ tmp = find_kstate_obj_by_ref(ctx, ref, KSTATE_CTX_NET_NS);
+ }
+ net_ns = tmp->o_obj;
+
+ nsproxy->net_ns = get_net(net_ns);
+ return 0;
+}
+#else
+static int restore_net_ns(struct kstate_context *ctx, kstate_ref_t *ref, struct nsproxy *nsproxy)
+{
+ /* NET_NS=n => NET_NS=n case. */
+ if (kstate_ref_undefined(ref))
+ return 0;
+ /* NET_NS=y => NET_NS=n case. */
+ return -EINVAL;
+}
+#endif
+
int kstate_restore_nsproxy(struct kstate_context *ctx, kstate_ref_t *ref)
{
struct kstate_image_nsproxy *i;
struct nsproxy *nsproxy;
-#ifdef CONFIG_NET_NS
- struct net *net_ns;
-#endif
int rv;
i = kstate_read_image(ctx, ref, KSTATE_OBJ_NSPROXY, sizeof(*i));
@@ -439,11 +489,9 @@ int kstate_restore_nsproxy(struct kstate_context *ctx, kstate_ref_t *ref)
rv = restore_pid_ns(ctx, &i->ref_pid_ns, nsproxy);
if (rv < 0)
goto out_pid_ns;
-
-#ifdef CONFIG_NET_NS
- net_ns = ctx->init_tsk->nsproxy->net_ns;
- nsproxy->net_ns = get_net(net_ns);
-#endif
+ rv = restore_net_ns(ctx, &i->ref_net_ns, nsproxy);
+ if (rv < 0)
+ goto out_net_ns;
kfree(i);
rv = kstate_restore_object(ctx, nsproxy, KSTATE_CTX_NSPROXY, ref);
@@ -452,6 +500,8 @@ int kstate_restore_nsproxy(struct kstate_context *ctx, kstate_ref_t *ref)
pr_debug("restore nsproxy %p, ref {%llu, %u}, rv %d\n", nsproxy, (unsigned long long)ref->pos, ref->id, rv);
return rv;
+out_net_ns:
+ put_pid_ns(nsproxy->pid_ns);
out_pid_ns:
put_mnt_ns(nsproxy->mnt_ns);
out_mnt_ns:
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 6b3edc9..f0073db 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -1,8 +1,10 @@
+/* Copyright (C) 2000-2009 Parallels Holdings, Ltd. */
#include <linux/workqueue.h>
#include <linux/rtnetlink.h>
#include <linux/cache.h>
#include <linux/slab.h>
#include <linux/list.h>
+#include <linux/nsproxy.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/idr.h>
@@ -115,7 +117,7 @@ static void net_free(struct net *net)
kmem_cache_free(net_cachep, net);
}
-static struct net *net_create(void)
+struct net *net_create(void)
{
struct net *net;
int rv;
@@ -500,3 +502,101 @@ assign:
return 0;
}
EXPORT_SYMBOL_GPL(net_assign_generic);
+
+#ifdef CONFIG_CHECKPOINT
+#include <linux/kstate.h>
+#include <linux/kstate-image.h>
+
+static int collect_net_ns(struct kstate_context *ctx, struct net *net_ns)
+{
+ int rv;
+
+ rv = kstate_collect_object(ctx, net_ns, KSTATE_CTX_NET_NS);
+ pr_debug("collect net_ns %p: rv %d\n", net_ns, rv);
+ return rv;
+}
+
+int kstate_collect_all_net_ns(struct kstate_context *ctx)
+{
+ struct kstate_object *obj;
+ int rv;
+
+ for_each_kstate_object(ctx, obj, KSTATE_CTX_NSPROXY) {
+ struct nsproxy *nsproxy = obj->o_obj;
+
+ rv = collect_net_ns(ctx, nsproxy->net_ns);
+ if (rv < 0)
+ return rv;
+ }
+ for_each_kstate_object(ctx, obj, KSTATE_CTX_NET_NS) {
+ struct net *net_ns = obj->o_obj;
+ unsigned int cnt = atomic_read(&net_ns->count);
+
+ if (obj->o_count + 1 != cnt) {
+ pr_err("net_ns %p has external references %lu:%u\n", net_ns, obj->o_count, cnt);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int dump_net_ns(struct kstate_context *ctx, struct kstate_object *obj)
+{
+ struct net *net_ns = obj->o_obj;
+ struct kstate_image_net_ns *i;
+ int rv;
+
+ i = kstate_prepare_image(KSTATE_OBJ_NET_NS, sizeof(*i));
+ if (!i)
+ return -ENOMEM;
+
+ rv = kstate_write_image(ctx, i, sizeof(*i), obj);
+ kfree(i);
+ pr_debug("dump net_ns %p: ref {%llu, %u}, rv %d\n", net_ns, (unsigned long long)obj->o_ref.pos, obj->o_ref.id, rv);
+ return rv;
+}
+
+int kstate_dump_all_net_ns(struct kstate_context *ctx)
+{
+ struct kstate_object *obj;
+ int rv;
+
+ for_each_kstate_object(ctx, obj, KSTATE_CTX_NET_NS) {
+ rv = dump_net_ns(ctx, obj);
+ if (rv < 0)
+ return rv;
+ }
+ return 0;
+}
+
+int kstate_restore_net_ns(struct kstate_context *ctx, kstate_ref_t *ref)
+{
+ struct kstate_image_net_ns *i;
+ struct net *net_ns;
+ int rv;
+
+ i = kstate_read_image(ctx, ref, KSTATE_OBJ_NET_NS, sizeof(*i));
+ if (IS_ERR(i))
+ return PTR_ERR(i);
+
+ net_ns = net_create();
+ if (!net_ns) {
+ rv = -ENOMEM;
+ goto out_free_image;
+ }
+
+ /* FIXME */
+ kfree(i);
+
+ rv = kstate_restore_object(ctx, net_ns, KSTATE_CTX_NET_NS, ref);
+ if (rv < 0)
+ put_net(net_ns);
+ pr_debug("restore net_ns %p: ref {%llu, %u}, rv %d\n", net_ns, (unsigned long long)ref->pos, ref->id, rv);
+ return rv;
+
+out_free_image:
+ kfree(i);
+ pr_debug("%s: return %d, ref {%llu, %u}\n", __func__, rv, (unsigned long long)ref->pos, ref->id);
+ return rv;
+}
+#endif
--
1.5.6.5
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