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Subject[PATCH 01/10] Introduce trivial sys_checkpoint and sys_restore system calls
Date
Right now they just return -ENOSYS. Later they will provide functionality
to checkpoint and restart a container.

Both syscalls take as arguments a file descriptor and flags.
Also sys_checkpoint take as the first argument a PID of container's init
(later it will be container ID); sys_restart takes as the first argument
a container ID (right now it will not be used).

Signed-off-by: Andrey Mirkin <major@openvz.org>
---
Makefile | 2 +-
arch/x86/kernel/syscall_table_32.S | 2 +
checkpoint/Makefile | 1 +
checkpoint/sys_core.c | 38 ++++++++++++++++++++++++++++++++++++
include/asm-x86/unistd_32.h | 2 +
5 files changed, 44 insertions(+), 1 deletions(-)
create mode 100644 checkpoint/Makefile
create mode 100644 checkpoint/sys_core.c
diff --git a/Makefile b/Makefile
index ea413fa..ce49afd 100644
--- a/Makefile
+++ b/Makefile
@@ -619,7 +619,7 @@ export mod_strip_cmd


ifeq ($(KBUILD_EXTMOD),)
-core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
+core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/ checkpoint/

vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
diff --git a/arch/x86/kernel/syscall_table_32.S b/arch/x86/kernel/syscall_table_32.S
index fd9d4f4..4a0d7fb 100644
--- a/arch/x86/kernel/syscall_table_32.S
+++ b/arch/x86/kernel/syscall_table_32.S
@@ -333,3 +333,5 @@ ENTRY(sys_call_table)
.long sys_pipe2
.long sys_inotify_init1
.long sys_hijack
+ .long sys_checkpoint
+ .long sys_restart /* 335 */
diff --git a/checkpoint/Makefile b/checkpoint/Makefile
new file mode 100644
index 0000000..2276fb1
--- /dev/null
+++ b/checkpoint/Makefile
@@ -0,0 +1 @@
+obj-y += sys_core.o
diff --git a/checkpoint/sys_core.c b/checkpoint/sys_core.c
new file mode 100644
index 0000000..1a97fb6
--- /dev/null
+++ b/checkpoint/sys_core.c
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2008 Parallels, Inc.
+ *
+ * Author: Andrey Mirkin <major@openvz.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ */
+
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/file.h>
+
+/**
+ * sys_checkpoint - checkpoint a container from outside
+ * @pid: pid of the container init(1) process
+ * TODO: should switch to container id later
+ * @fd: file to which save the checkpoint image
+ * @flags: checkpoint operation flags
+ */
+asmlinkage long sys_checkpoint(pid_t pid, int fd, unsigned long flags)
+{
+ return -ENOSYS;
+}
+
+/**
+ * sys_restart - restart a container
+ * @ctid: container id which should be used to restart a container
+ * @fd: file from which read the checkpoint image
+ * @flags: restart operation flags
+ */
+asmlinkage long sys_restart(int ctid, int fd, unsigned long flags)
+{
+ return -ENOSYS;
+}
diff --git a/include/asm-x86/unistd_32.h b/include/asm-x86/unistd_32.h
index 70280da..1a09604 100644
--- a/include/asm-x86/unistd_32.h
+++ b/include/asm-x86/unistd_32.h
@@ -339,6 +339,8 @@
#define __NR_pipe2 331
#define __NR_inotify_init1 332
#define __NR_hijack 333
+#define __NR_checkpoint 334
+#define __NR_restart 335

#ifdef __KERNEL__

--
1.5.6


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