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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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