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Subject[PATCH 1/9] Create syscalls: sys_checkpoint, sys_restart
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From: Oren Laadan <orenl@cs.columbia.edu>

Create trivial sys_checkpoint and sys_restore system calls. They will
enable to checkpoint and restart an entire container, to and from a
checkpoint image file descriptor.

The syscalls take a file descriptor (for the image file) and flags as
arguments. For sys_checkpoint the first argument identifies the target
container; for sys_restart it will identify the checkpoint image.

Signed-off-by: Oren Laadan <orenl@cs.columbia.edu>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
---
linux-2.6.git-dave/arch/x86/kernel/syscall_table_32.S | 2
linux-2.6.git-dave/checkpoint/Kconfig | 11 ++++
linux-2.6.git-dave/checkpoint/Makefile | 5 ++
linux-2.6.git-dave/checkpoint/sys.c | 41 ++++++++++++++++++
linux-2.6.git-dave/include/asm-x86/unistd_32.h | 2
linux-2.6.git-dave/include/linux/syscalls.h | 2
linux-2.6.git-dave/init/Kconfig | 2
linux-2.6.git-dave/kernel/sys_ni.c | 4 +
8 files changed, 69 insertions(+)
diff -puN arch/x86/kernel/syscall_table_32.S~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart arch/x86/kernel/syscall_table_32.S
--- linux-2.6.git/arch/x86/kernel/syscall_table_32.S~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700
+++ linux-2.6.git-dave/arch/x86/kernel/syscall_table_32.S 2008-10-16 10:53:33.000000000 -0700
@@ -332,3 +332,5 @@ ENTRY(sys_call_table)
.long sys_dup3 /* 330 */
.long sys_pipe2
.long sys_inotify_init1
+ .long sys_checkpoint
+ .long sys_restart
diff -puN /dev/null checkpoint/Kconfig
--- /dev/null 2008-09-02 09:40:19.000000000 -0700
+++ linux-2.6.git-dave/checkpoint/Kconfig 2008-10-16 10:53:33.000000000 -0700
@@ -0,0 +1,11 @@
+config CHECKPOINT_RESTART
+ prompt "Enable checkpoint/restart (EXPERIMENTAL)"
+ def_bool n
+ depends on X86_32 && EXPERIMENTAL
+ help
+ Application checkpoint/restart is the ability to save the
+ state of a running application so that it can later resume
+ its execution from the time at which it was checkpointed.
+
+ Turning this option on will enable checkpoint and restart
+ functionality in the kernel.
diff -puN /dev/null checkpoint/Makefile
--- /dev/null 2008-09-02 09:40:19.000000000 -0700
+++ linux-2.6.git-dave/checkpoint/Makefile 2008-10-16 10:53:33.000000000 -0700
@@ -0,0 +1,5 @@
+#
+# Makefile for linux checkpoint/restart.
+#
+
+obj-$(CONFIG_CHECKPOINT_RESTART) += sys.o
diff -puN /dev/null checkpoint/sys.c
--- /dev/null 2008-09-02 09:40:19.000000000 -0700
+++ linux-2.6.git-dave/checkpoint/sys.c 2008-10-16 10:53:33.000000000 -0700
@@ -0,0 +1,41 @@
+/*
+ * Generic container checkpoint-restart
+ *
+ * Copyright (C) 2008 Oren Laadan
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of the Linux
+ * distribution for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+
+/**
+ * sys_checkpoint - checkpoint a container
+ * @pid: pid of the container init(1) process
+ * @fd: file to which dump the checkpoint image
+ * @flags: checkpoint operation flags
+ *
+ * Returns positive identifier on success, 0 when returning from restart
+ * or negative value on error
+ */
+asmlinkage long sys_checkpoint(pid_t pid, int fd, unsigned long flags)
+{
+ pr_debug("sys_checkpoint not implemented yet\n");
+ return -ENOSYS;
+}
+/**
+ * sys_restart - restart a container
+ * @crid: checkpoint image identifier
+ * @fd: file from which read the checkpoint image
+ * @flags: restart operation flags
+ *
+ * Returns negative value on error, or otherwise returns in the realm
+ * of the original checkpoint
+ */
+asmlinkage long sys_restart(int crid, int fd, unsigned long flags)
+{
+ pr_debug("sys_restart not implemented yet\n");
+ return -ENOSYS;
+}
diff -puN include/asm-x86/unistd_32.h~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart include/asm-x86/unistd_32.h
--- linux-2.6.git/include/asm-x86/unistd_32.h~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700
+++ linux-2.6.git-dave/include/asm-x86/unistd_32.h 2008-10-16 10:53:33.000000000 -0700
@@ -338,6 +338,8 @@
#define __NR_dup3 330
#define __NR_pipe2 331
#define __NR_inotify_init1 332
+#define __NR_checkpoint 333
+#define __NR_restart 334

#ifdef __KERNEL__

diff -puN include/linux/syscalls.h~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart include/linux/syscalls.h
--- linux-2.6.git/include/linux/syscalls.h~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700
+++ linux-2.6.git-dave/include/linux/syscalls.h 2008-10-16 10:53:33.000000000 -0700
@@ -622,6 +622,8 @@ asmlinkage long sys_timerfd_gettime(int
asmlinkage long sys_eventfd(unsigned int count);
asmlinkage long sys_eventfd2(unsigned int count, int flags);
asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len);
+asmlinkage long sys_checkpoint(pid_t pid, int fd, unsigned long flags);
+asmlinkage long sys_restart(int crid, int fd, unsigned long flags);

int kernel_execve(const char *filename, char *const argv[], char *const envp[]);

diff -puN init/Kconfig~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart init/Kconfig
--- linux-2.6.git/init/Kconfig~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700
+++ linux-2.6.git-dave/init/Kconfig 2008-10-16 10:53:33.000000000 -0700
@@ -779,6 +779,8 @@ config MARKERS

source "arch/Kconfig"

+source "checkpoint/Kconfig"
+
endmenu # General setup

config HAVE_GENERIC_DMA_COHERENT
diff -puN kernel/sys_ni.c~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart kernel/sys_ni.c
--- linux-2.6.git/kernel/sys_ni.c~v6_PATCH_1_9_Create_syscalls-_sys_checkpoint_sys_restart 2008-10-16 10:53:33.000000000 -0700
+++ linux-2.6.git-dave/kernel/sys_ni.c 2008-10-16 10:53:33.000000000 -0700
@@ -169,3 +169,7 @@ cond_syscall(compat_sys_timerfd_settime)
cond_syscall(compat_sys_timerfd_gettime);
cond_syscall(sys_eventfd);
cond_syscall(sys_eventfd2);
+
+/* checkpoint/restart */
+cond_syscall(sys_checkpoint);
+cond_syscall(sys_restart);
_

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