linux-kernel - Re: [PATCH 1/2] Add flags for user-space and in-kernel process creation

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Date:	Mon, 24 Nov 2008 17:02:11 +0100
From:	Louis Rilling <Louis.Rilling@...labs.com>
To:	Andrey Mirkin <major@...nvz.org>
Cc:	orenl@...columbia.edu, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Add flags for user-space and in-kernel process
	creation

On 24/11/08 18:39 +0300, Andrey Mirkin wrote:
> Introduce 2 flags for user-space and in-kernel process creation during
> restart procedure.
> Also a stub function for in-kernel process restart is introduced.
> 

[...]

> diff --git a/checkpoint/sys.c b/checkpoint/sys.c
> index 7745500..e4a9287 100644
> --- a/checkpoint/sys.c
> +++ b/checkpoint/sys.c
> @@ -264,8 +264,8 @@ asmlinkage long sys_restart(int crid, int fd, unsigned long flags)
>  	pid_t pid;
>  	int ret;
>  
> -	/* no flags for now */
> -	if (flags)
> +	if ((flags & (CR_CTX_RSTR_IN_USERSPACE | CR_CTX_RSTR_IN_USERSPACE)) ==
> +			(CR_CTX_RSTR_IN_USERSPACE | CR_CTX_RSTR_IN_USERSPACE))

I guess that the intent was:
+	if ((flags & (CR_CTX_RSTR_IN_USERSPACE | CR_CTX_RSTR_IN_KERNEL)) ==
+			(CR_CTX_RSTR_IN_USERSPACE | CR_CTX_RSTR_IN_KERNEL))

?

Louis

>  		return -EINVAL;
>  
>  	/* FIXME: for now, we use 'crid' as a pid */
> diff --git a/include/linux/checkpoint.h b/include/linux/checkpoint.h
> index cab5e19..947469a 100644
> --- a/include/linux/checkpoint.h
> +++ b/include/linux/checkpoint.h
> @@ -61,6 +61,8 @@ struct cr_ctx {
>  /* cr_ctx: flags */
>  #define CR_CTX_CKPT	0x1
>  #define CR_CTX_RSTR	0x2
> +#define CR_CTX_RSTR_IN_USERSPACE	0x4
> +#define CR_CTX_RSTR_IN_KERNEL		0x8
>  
>  extern int cr_kwrite(struct cr_ctx *ctx, void *buf, int count);
>  extern int cr_kread(struct cr_ctx *ctx, void *buf, int count);
> @@ -108,6 +110,7 @@ extern int cr_write_mm(struct cr_ctx *ctx, struct task_struct *t);
>  extern int cr_write_files(struct cr_ctx *ctx, struct task_struct *t);
>  
>  extern int do_restart(struct cr_ctx *ctx, pid_t pid);
> +extern int do_restart_in_kernel(struct cr_ctx *ctx);
>  extern int cr_read_mm(struct cr_ctx *ctx);
>  extern int cr_read_files(struct cr_ctx *ctx);
>  
> -- 
> 1.5.6
> 
> --
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-- 
Dr Louis Rilling			Kerlabs
Skype: louis.rilling			Batiment Germanium
Phone: (+33|0) 6 80 89 08 23		80 avenue des Buttes de Coesmes
http://www.kerlabs.com/			35700 Rennes

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