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Date: Wed, 27 May 2009 13:32:56 -0400
From: Oren Laadan <orenl@...columbia.edu>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...l.org>,
containers@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-api@...r.kernel.org, Serge Hallyn <serue@...ibm.com>,
Dave Hansen <dave@...ux.vnet.ibm.com>,
Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Pavel Emelyanov <xemul@...nvz.org>,
Alexey Dobriyan <adobriyan@...il.com>,
Dan Smith <danms@...ibm.com>,
Oren Laadan <orenl@...columbia.edu>
Subject: [RFC v16][PATCH 30/43] c/r: stub implementation for IPC namespace
From: Dan Smith <danms@...ibm.com>
Changes:
- Update to match UTS changes
Signed-off-by: Dan Smith <danms@...ibm.com>
Signed-off-by: Oren Laadan <orenl@...columbia.edu>
---
checkpoint/checkpoint.c | 2 --
checkpoint/objhash.c | 28 ++++++++++++++++++++++++++++
checkpoint/process.c | 24 ++++++++++++++++++++++--
include/linux/checkpoint.h | 15 +++++++++++++++
include/linux/checkpoint_hdr.h | 3 +++
5 files changed, 68 insertions(+), 4 deletions(-)
diff --git a/checkpoint/checkpoint.c b/checkpoint/checkpoint.c
index 904f19b..afc7300 100644
--- a/checkpoint/checkpoint.c
+++ b/checkpoint/checkpoint.c
@@ -310,8 +310,6 @@ static int may_checkpoint_task(struct ckpt_ctx *ctx, struct task_struct *t)
rcu_read_lock();
nsproxy = task_nsproxy(t);
- if (nsproxy->ipc_ns != ctx->root_nsproxy->ipc_ns)
- ret = -EPERM;
if (nsproxy->mnt_ns != ctx->root_nsproxy->mnt_ns)
ret = -EPERM;
if (nsproxy->pid_ns != ctx->root_nsproxy->pid_ns)
diff --git a/checkpoint/objhash.c b/checkpoint/objhash.c
index 8b7adc6..045a920 100644
--- a/checkpoint/objhash.c
+++ b/checkpoint/objhash.c
@@ -15,6 +15,8 @@
#include <linux/hash.h>
#include <linux/file.h>
#include <linux/fdtable.h>
+#include <linux/sched.h>
+#include <linux/ipc_namespace.h>
#include <linux/checkpoint.h>
#include <linux/checkpoint_hdr.h>
@@ -159,6 +161,22 @@ static int obj_uts_ns_users(void *ptr)
return atomic_read(&((struct uts_namespace *) ptr)->kref.refcount);
}
+static int obj_ipc_ns_grab(void *ptr)
+{
+ get_ipc_ns((struct ipc_namespace *) ptr);
+ return 0;
+}
+
+static void obj_ipc_ns_drop(void *ptr)
+{
+ put_ipc_ns((struct ipc_namespace *) ptr);
+}
+
+static int obj_ipc_ns_users(void *ptr)
+{
+ return atomic_read(&((struct ipc_namespace *) ptr)->count);
+}
+
static struct ckpt_obj_ops ckpt_obj_ops[] = {
/* ignored object */
{
@@ -226,6 +244,16 @@ static struct ckpt_obj_ops ckpt_obj_ops[] = {
.checkpoint = checkpoint_bad,
.restore = restore_bad,
},
+ /* ipc_ns object */
+ {
+ .obj_name = "IPC_NS",
+ .obj_type = CKPT_OBJ_IPC_NS,
+ .ref_drop = obj_ipc_ns_drop,
+ .ref_grab = obj_ipc_ns_grab,
+ .ref_users = obj_ipc_ns_users,
+ .checkpoint = checkpoint_bad,
+ .restore = restore_bad,
+ },
};
diff --git a/checkpoint/process.c b/checkpoint/process.c
index a827987..eff3d76 100644
--- a/checkpoint/process.c
+++ b/checkpoint/process.c
@@ -89,6 +89,7 @@ static int do_checkpoint_ns(struct ckpt_ctx *ctx, struct nsproxy *nsproxy)
struct ckpt_hdr_ns *h;
int ns_flags = 0;
int uts_objref;
+ int ipc_objref;
int first, ret;
uts_objref = ckpt_obj_lookup_add(ctx, nsproxy->uts_ns,
@@ -98,12 +99,20 @@ static int do_checkpoint_ns(struct ckpt_ctx *ctx, struct nsproxy *nsproxy)
if (first)
ns_flags |= CLONE_NEWUTS;
+ ipc_objref = ckpt_obj_lookup_add(ctx, nsproxy->ipc_ns,
+ CKPT_OBJ_IPC_NS, &first);
+ if (ipc_objref < 0)
+ return ipc_objref;
+ if (first)
+ ns_flags |= CLONE_NEWIPC;
+
h = ckpt_hdr_get_type(ctx, sizeof(*h), CKPT_HDR_NS);
if (!h)
return -ENOMEM;
h->flags = ns_flags;
h->uts_objref = uts_objref;
+ h->ipc_objref = ipc_objref;
ret = ckpt_write_obj(ctx, &h->h);
ckpt_hdr_put(ctx, h);
@@ -112,6 +121,10 @@ static int do_checkpoint_ns(struct ckpt_ctx *ctx, struct nsproxy *nsproxy)
if (ns_flags & CLONE_NEWUTS)
ret = checkpoint_uts_ns(ctx, nsproxy->uts_ns);
+#if 0
+ if (!ret && (ns_flags & CLONE_NEWIPC))
+ ret = checkpoint_ipc_ns(ctx, nsproxy->ipc_ns);
+#endif
/* FIX: Write other namespaces here */
return ret;
@@ -438,9 +451,10 @@ static struct nsproxy *do_restore_ns(struct ckpt_ctx *ctx)
return (struct nsproxy *) h;
ret = -EINVAL;
- if (h->uts_objref <= 0)
+ if (h->uts_objref <= 0 ||
+ h->ipc_objref <= 0)
goto out;
- if (h->flags & ~CLONE_NEWUTS)
+ if (h->flags & ~(CLONE_NEWUTS | CLONE_NEWIPC))
goto out;
/* each unseen-before namespace will be un-shared now */
@@ -456,6 +470,12 @@ static struct nsproxy *do_restore_ns(struct ckpt_ctx *ctx)
*/
ret = restore_uts_ns(ctx, h->uts_objref, h->flags);
ckpt_debug("uts ns: %d\n", ret);
+ if (ret < 0)
+ goto out;
+#if 0
+ ret = restore_ipc_ns(ctx, h->ipc_objref, h->flags);
+ ckpt_debug("ipc ns: %d\n", ret);
+#endif
/* FIX: add more namespaces here */
out:
diff --git a/include/linux/checkpoint.h b/include/linux/checkpoint.h
index a7125fc..5a42399 100644
--- a/include/linux/checkpoint.h
+++ b/include/linux/checkpoint.h
@@ -81,6 +81,21 @@ extern int restore_restart_block(struct ckpt_ctx *ctx);
extern int checkpoint_ns(struct ckpt_ctx *ctx, void *ptr);
extern void *restore_ns(struct ckpt_ctx *ctx);
+#if 0
+/* ipc-ns */
+#ifdef CONFIG_SYSVIPC
+extern int checkpoint_ipc_ns(struct ckpt_ctx *ctx,
+ struct ipc_namespace *ipc_ns);
+extern int restore_ipc_ns(struct ckpt_ctx *ctx, int ns_objref, int flags);
+#else
+static inline int checkpoint_ipc_ns(struct ckpt_ctx *ctx,
+ struct ipc_namespace *ipc_ns)
+{ return 0; }
+static inline int restore_ipc_ns(struct ckpt_ctx *ctx)
+{ return 0; }
+#endif /* CONFIG_SYSVIPC */
+#endif
+
/* file table */
extern int checkpoint_obj_file_table(struct ckpt_ctx *ctx,
struct task_struct *t);
diff --git a/include/linux/checkpoint_hdr.h b/include/linux/checkpoint_hdr.h
index 1603279..44a48dc 100644
--- a/include/linux/checkpoint_hdr.h
+++ b/include/linux/checkpoint_hdr.h
@@ -55,6 +55,7 @@ enum {
CKPT_HDR_CPU,
CKPT_HDR_NS,
CKPT_HDR_UTS_NS,
+ CKPT_HDR_IPC_NS,
/* 201-299: reserved for arch-dependent */
@@ -95,6 +96,7 @@ enum obj_type {
CKPT_OBJ_MM,
CKPT_OBJ_NS,
CKPT_OBJ_UTS_NS,
+ CKPT_OBJ_IPC_NS,
CKPT_OBJ_MAX
};
@@ -167,6 +169,7 @@ struct ckpt_hdr_ns {
struct ckpt_hdr h;
__u32 flags;
__s32 uts_objref;
+ __u32 ipc_objref;
} __attribute__((aligned(8)));
/* task's shared resources */
--
1.6.0.4
--
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