[PATCH 28/38] C/R: formally checkpoint/restore struct ipc_namespace
From: Alexey Dobriyan
Date: Fri May 22 2009 - 01:02:44 EST
No IPC objects are done yet, only struct ipc_namespace itself and
tsk->nsproxy->ipc_ns skeleton.
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---
include/linux/ipc_namespace.h | 3 +
include/linux/kstate-image.h | 6 ++
include/linux/kstate.h | 19 ++++++++
ipc/namespace.c | 101 +++++++++++++++++++++++++++++++++++++++-
kernel/kstate/cpt-sys.c | 6 ++
kernel/kstate/kstate-context.c | 8 +++
kernel/kstate/kstate-object.c | 6 ++
kernel/nsproxy.c | 66 +++++++++++++++++++++++---
8 files changed, 206 insertions(+), 9 deletions(-)
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index e408722..2f75a2d 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -94,6 +94,7 @@ static inline int mq_init_ns(struct ipc_namespace *ns) { return 0; }
#endif
#if defined(CONFIG_IPC_NS)
+extern struct ipc_namespace *create_ipc_ns(void);
extern struct ipc_namespace *copy_ipcs(unsigned long flags,
struct ipc_namespace *ns);
static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
@@ -105,6 +106,8 @@ static inline struct ipc_namespace *get_ipc_ns(struct ipc_namespace *ns)
extern void put_ipc_ns(struct ipc_namespace *ns);
#else
+#include <linux/sched.h>
+
static inline struct ipc_namespace *copy_ipcs(unsigned long flags,
struct ipc_namespace *ns)
{
diff --git a/include/linux/kstate-image.h b/include/linux/kstate-image.h
index 2eef50b..43a1458 100644
--- a/include/linux/kstate-image.h
+++ b/include/linux/kstate-image.h
@@ -45,6 +45,7 @@ struct kstate_image_header {
#define KSTATE_OBJ_PAGE 5
#define KSTATE_OBJ_NSPROXY 6
#define KSTATE_OBJ_UTS_NS 7
+#define KSTATE_OBJ_IPC_NS 8
struct kstate_object_header {
__u32 obj_type;
@@ -211,6 +212,7 @@ struct kstate_image_nsproxy {
struct kstate_object_header hdr;
kstate_ref_t ref_uts_ns;
+ kstate_ref_t ref_ipc_ns; /* KSTATE_REF_UNDEF if IPC_NS=n */
} __packed;
struct kstate_image_uts_ns {
@@ -223,4 +225,8 @@ struct kstate_image_uts_ns {
__u8 machine[64];
__u8 domainname[64];
} __packed;
+
+struct kstate_image_ipc_ns {
+ struct kstate_object_header hdr;
+} __packed;
#endif
diff --git a/include/linux/kstate.h b/include/linux/kstate.h
index dba4803..61bed98 100644
--- a/include/linux/kstate.h
+++ b/include/linux/kstate.h
@@ -22,6 +22,9 @@ struct kstate_object {
/* Not visible to userspace! */
enum kstate_context_obj_type {
KSTATE_CTX_FILE,
+#ifdef CONFIG_IPC_NS
+ KSTATE_CTX_IPC_NS,
+#endif
KSTATE_CTX_MM_STRUCT,
KSTATE_CTX_NSPROXY,
KSTATE_CTX_TASK_STRUCT,
@@ -77,6 +80,22 @@ int kstate_collect_all_uts_ns(struct kstate_context *ctx);
int kstate_dump_all_uts_ns(struct kstate_context *ctx);
int kstate_restore_uts_ns(struct kstate_context *ctx, kstate_ref_t *ref);
+#ifdef CONFIG_IPC_NS
+int kstate_collect_all_ipc_ns(struct kstate_context *ctx);
+int kstate_dump_all_ipc_ns(struct kstate_context *ctx);
+int kstate_restore_ipc_ns(struct kstate_context *ctx, kstate_ref_t *ref);
+#else
+static inline int kstate_collect_all_ipc_ns(struct kstate_context *ctx)
+{
+ return 0;
+}
+
+static inline int kstate_dump_all_ipc_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/ipc/namespace.c b/ipc/namespace.c
index a1094ff..bfdc3dc 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -1,6 +1,7 @@
/*
* linux/ipc/namespace.c
* Copyright (C) 2006 Pavel Emelyanov <xemul@xxxxxxxxxx> OpenVZ, SWsoft Inc.
+ * Copyright (C) 2009 Parallels Holdings, Ltd.
*/
#include <linux/ipc.h>
@@ -14,7 +15,7 @@
#include "util.h"
-static struct ipc_namespace *create_ipc_ns(void)
+struct ipc_namespace *create_ipc_ns(void)
{
struct ipc_namespace *ns;
int err;
@@ -132,3 +133,101 @@ void put_ipc_ns(struct ipc_namespace *ns)
free_ipc_ns(ns);
}
}
+
+#ifdef CONFIG_CHECKPOINT
+#include <linux/kstate.h>
+#include <linux/kstate-image.h>
+
+static int collect_ipc_ns(struct kstate_context *ctx, struct ipc_namespace *ipc_ns)
+{
+ int rv;
+
+ rv = kstate_collect_object(ctx, ipc_ns, KSTATE_CTX_IPC_NS);
+ pr_debug("collect ipc_ns %p: rv %d\n", ipc_ns, rv);
+ return rv;
+}
+
+int kstate_collect_all_ipc_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_ipc_ns(ctx, nsproxy->ipc_ns);
+ if (rv < 0)
+ return rv;
+ }
+ for_each_kstate_object(ctx, obj, KSTATE_CTX_IPC_NS) {
+ struct ipc_namespace *ipc_ns = obj->o_obj;
+ unsigned int cnt = atomic_read(&ipc_ns->count);
+
+ if (obj->o_count + 1 != cnt) {
+ pr_err("ipc_ns %p has external references %lu:%u\n", ipc_ns, obj->o_count, cnt);
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static int dump_ipc_ns(struct kstate_context *ctx, struct kstate_object *obj)
+{
+ struct ipc_namespace *ipc_ns = obj->o_obj;
+ struct kstate_image_ipc_ns *i;
+ int rv;
+
+ i = kstate_prepare_image(KSTATE_OBJ_IPC_NS, sizeof(*i));
+ if (!i)
+ return -ENOMEM;
+
+ rv = kstate_write_image(ctx, i, sizeof(*i), obj);
+ kfree(i);
+ pr_debug("dump ipc_ns %p: ref {%llu, %u}, rv %d\n", ipc_ns, (unsigned long long)obj->o_ref.pos, obj->o_ref.id, rv);
+ return rv;
+}
+
+int kstate_dump_all_ipc_ns(struct kstate_context *ctx)
+{
+ struct kstate_object *obj;
+ int rv;
+
+ for_each_kstate_object(ctx, obj, KSTATE_CTX_IPC_NS) {
+ rv = dump_ipc_ns(ctx, obj);
+ if (rv < 0)
+ return rv;
+ }
+ return 0;
+}
+
+int kstate_restore_ipc_ns(struct kstate_context *ctx, kstate_ref_t *ref)
+{
+ struct kstate_image_ipc_ns *i;
+ struct ipc_namespace *ipc_ns;
+ int rv;
+
+ i = kstate_read_image(ctx, ref, KSTATE_OBJ_IPC_NS, sizeof(*i));
+ if (IS_ERR(i))
+ return PTR_ERR(i);
+
+ ipc_ns = create_ipc_ns();
+ if (!ipc_ns) {
+ rv = -ENOMEM;
+ goto out_free_image;
+ }
+
+ /* FIXME */
+ kfree(i);
+
+ rv = kstate_restore_object(ctx, ipc_ns, KSTATE_CTX_IPC_NS, ref);
+ if (rv < 0)
+ put_ipc_ns(ipc_ns);
+ pr_debug("restore ipc_ns %p: ref {%llu, %u}, rv %d\n", ipc_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
diff --git a/kernel/kstate/cpt-sys.c b/kernel/kstate/cpt-sys.c
index 7d4681a..1b03de5 100644
--- a/kernel/kstate/cpt-sys.c
+++ b/kernel/kstate/cpt-sys.c
@@ -71,6 +71,9 @@ static int kstate_collect(struct kstate_context *ctx)
rv = kstate_collect_all_uts_ns(ctx);
if (rv < 0)
return rv;
+ rv = kstate_collect_all_ipc_ns(ctx);
+ if (rv < 0)
+ return rv;
rv = kstate_collect_all_mm_struct(ctx);
if (rv < 0)
return rv;
@@ -133,6 +136,9 @@ static int kstate_dump(struct kstate_context *ctx)
rv = kstate_dump_all_mm_struct(ctx);
if (rv < 0)
return rv;
+ rv = kstate_dump_all_ipc_ns(ctx);
+ if (rv < 0)
+ return rv;
rv = kstate_dump_all_uts_ns(ctx);
if (rv < 0)
return rv;
diff --git a/kernel/kstate/kstate-context.c b/kernel/kstate/kstate-context.c
index 98dc0c0..c2449d5 100644
--- a/kernel/kstate/kstate-context.c
+++ b/kernel/kstate/kstate-context.c
@@ -1,5 +1,6 @@
/* Copyright (C) 2000-2009 Parallels Holdings, Ltd. */
#include <linux/file.h>
+#include <linux/ipc_namespace.h>
#include <linux/list.h>
#include <linux/nsproxy.h>
#include <linux/sched.h>
@@ -37,6 +38,13 @@ void kstate_context_destroy(struct kstate_context *ctx)
list_del(&obj->o_list);
kfree(obj);
}
+#ifdef CONFIG_IPC_NS
+ for_each_kstate_object_safe(ctx, obj, tmp, KSTATE_CTX_IPC_NS) {
+ put_ipc_ns((struct ipc_namespace *)obj->o_obj);
+ list_del(&obj->o_list);
+ kfree(obj);
+ }
+#endif
for_each_kstate_object_safe(ctx, obj, tmp, KSTATE_CTX_MM_STRUCT) {
mmput((struct mm_struct *)obj->o_obj);
list_del(&obj->o_list);
diff --git a/kernel/kstate/kstate-object.c b/kernel/kstate/kstate-object.c
index aeadd95..0056572 100644
--- a/kernel/kstate/kstate-object.c
+++ b/kernel/kstate/kstate-object.c
@@ -1,5 +1,6 @@
/* Copyright (C) 2000-2009 Parallels Holdings, Ltd. */
#include <linux/fs.h>
+#include <linux/ipc_namespace.h>
#include <linux/mm_types.h>
#include <linux/nsproxy.h>
#include <linux/sched.h>
@@ -34,6 +35,11 @@ int kstate_collect_object(struct kstate_context *ctx, void *p, enum kstate_conte
case KSTATE_CTX_FILE:
get_file((struct file *)obj->o_obj);
break;
+#ifdef CONFIG_IPC_NS
+ case KSTATE_CTX_IPC_NS:
+ get_ipc_ns((struct ipc_namespace *)obj->o_obj);
+ break;
+#endif
case KSTATE_CTX_MM_STRUCT:
atomic_inc(&((struct mm_struct *)obj->o_obj)->mm_users);
break;
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index b2a7ed3..7cb82e3 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -280,6 +280,12 @@ static int dump_nsproxy(struct kstate_context *ctx, struct kstate_object *obj)
tmp = find_kstate_obj_by_ptr(ctx, nsproxy->uts_ns, KSTATE_CTX_UTS_NS);
i->ref_uts_ns = tmp->o_ref;
+#ifdef CONFIG_IPC_NS
+ tmp = find_kstate_obj_by_ptr(ctx, nsproxy->ipc_ns, KSTATE_CTX_IPC_NS);
+ i->ref_ipc_ns = tmp->o_ref;
+#else
+ i->ref_ipc_ns = KSTATE_REF_UNDEF;
+#endif
rv = kstate_write_image(ctx, i, sizeof(*i), obj);
kfree(i);
@@ -320,13 +326,57 @@ static int restore_uts_ns(struct kstate_context *ctx, kstate_ref_t *ref, struct
return 0;
}
+#ifdef CONFIG_IPC_NS
+static int restore_ipc_ns(struct kstate_context *ctx, kstate_ref_t *ref, struct nsproxy *nsproxy)
+{
+ struct ipc_namespace *ipc_ns;
+ struct kstate_object *tmp;
+ int rv;
+
+ if (kstate_ref_undefined(ref)) {
+ /*
+ * IPC_NS=n => IPC_NS=y case: hope nobody is crazy enough
+ * to depend on IPC_NS absence.
+ */
+ ipc_ns = create_ipc_ns();
+ if (IS_ERR(ipc_ns))
+ return PTR_ERR(ipc_ns);
+ rv = kstate_restore_object(ctx, ipc_ns, KSTATE_CTX_IPC_NS, ref);
+ if (rv < 0) {
+ put_ipc_ns(ipc_ns);
+ return rv;
+ }
+ nsproxy->ipc_ns = ipc_ns;
+ return 0;
+ }
+ /* IPC_NS=y => IPC_NS=y case. */
+ tmp = find_kstate_obj_by_ref(ctx, ref, KSTATE_CTX_IPC_NS);
+ if (!tmp) {
+ rv = kstate_restore_ipc_ns(ctx, ref);
+ if (rv < 0)
+ return rv;
+ tmp = find_kstate_obj_by_ref(ctx, ref, KSTATE_CTX_IPC_NS);
+ }
+ ipc_ns = tmp->o_obj;
+
+ nsproxy->ipc_ns = get_ipc_ns(ipc_ns);
+ return 0;
+}
+#else
+static int restore_ipc_ns(struct kstate_context *ctx, kstate_ref_t *ref, struct nsproxy *nsproxy)
+{
+ /* IPC_NS=n => IPC_NS=n case. */
+ if (kstate_ref_undefined(ref))
+ return 0;
+ /* IPC_NS=y => IPC_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_IPC_NS
- struct ipc_namespace *ipc_ns;
-#endif
struct mnt_namespace *mnt_ns;
struct pid_namespace *pid_ns;
#ifdef CONFIG_NET_NS
@@ -347,11 +397,9 @@ int kstate_restore_nsproxy(struct kstate_context *ctx, kstate_ref_t *ref)
rv = restore_uts_ns(ctx, &i->ref_uts_ns, nsproxy);
if (rv < 0)
goto out_uts_ns;
-
-#ifdef CONFIG_IPC_NS
- ipc_ns = ctx->init_tsk->nsproxy->ipc_ns;
- nsproxy->ipc_ns = get_ipc_ns(ipc_ns);
-#endif
+ rv = restore_ipc_ns(ctx, &i->ref_ipc_ns, nsproxy);
+ if (rv < 0)
+ goto out_ipc_ns;
mnt_ns = ctx->init_tsk->nsproxy->mnt_ns;
get_mnt_ns(mnt_ns);
@@ -372,6 +420,8 @@ 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_ipc_ns:
+ put_uts_ns(nsproxy->uts_ns);
out_uts_ns:
kmem_cache_free(nsproxy_cachep, nsproxy);
out_free_image:
--
1.5.6.5
--
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