/*
 *  linux/kernel/vserver/legacy.c
 *
 *  Virtual Server: Legacy Funtions
 *
 *  Copyright (C) 2001-2003  Jacques Gelinas
 *  Copyright (C) 2003-2005  Herbert Pötzl
 *
 *  V0.01  broken out from vcontext.c V0.05
 *
 */

#include <linux/config.h>
#include <linux/sched.h>
#include <linux/vs_context.h>
#include <linux/vs_network.h>
#include <linux/vserver/legacy.h>
#include <linux/vserver/namespace.h>
#include <linux/namespace.h>

#include <asm/errno.h>
#include <asm/uaccess.h>



static int vx_set_initpid(struct vx_info *vxi, int pid)
{
	if (vxi->vx_initpid)
		return -EPERM;

	vxi->vx_initpid = pid;
	return 0;
}

int vc_new_s_context(uint32_t ctx, void __user *data)
{
	int ret = -ENOMEM;
	struct vcmd_new_s_context_v1 vc_data;
	struct vx_info *new_vxi;

	if (copy_from_user(&vc_data, data, sizeof(vc_data)))
		return -EFAULT;

	/* legacy hack, will be removed soon */
	if (ctx == -2) {
		/* assign flags and initpid */
		if (!current->vx_info)
			return -EINVAL;
		ret = 0;
		if (vc_data.flags & VX_INFO_INIT)
			ret = vx_set_initpid(current->vx_info, current->tgid);
		if (ret == 0) {
			/* We keep the same vx_id, but lower the capabilities */
			current->vx_info->vx_bcaps &= (~vc_data.remove_cap);
			ret = vx_current_xid();
			current->vx_info->vx_flags |= vc_data.flags;
		}
		return ret;
	}

	if (!vx_check(0, VX_ADMIN) || !capable(CAP_SYS_ADMIN)
		/* might make sense in the future, or not ... */
		|| vx_flags(VX_INFO_LOCK, 0))
		return -EPERM;

	/* ugly hack for Spectator */
	if (ctx == 1) {
		current->xid = 1;
		return 0;
	}

	if (((ctx > MAX_S_CONTEXT) && (ctx != VX_DYNAMIC_ID)) ||
		(ctx == 0))
		return -EINVAL;

	if ((ctx == VX_DYNAMIC_ID) || (ctx < MIN_D_CONTEXT))
		new_vxi = locate_or_create_vx_info(ctx);
	else
		new_vxi = locate_vx_info(ctx);

	if (!new_vxi)
		return -EINVAL;

	ret = -EPERM;
	if (!vx_info_flags(new_vxi, VXF_STATE_SETUP, 0) &&
		vx_info_flags(new_vxi, VX_INFO_PRIVATE, 0))
		goto out_put;

	new_vxi->vx_flags &= ~(VXF_STATE_SETUP|VXF_STATE_INIT);

	ret = vx_migrate_task(current, new_vxi);
	if (ret == 0) {
		current->vx_info->vx_bcaps &= (~vc_data.remove_cap);
		new_vxi->vx_flags |= vc_data.flags;
		if (vc_data.flags & VX_INFO_INIT)
			vx_set_initpid(new_vxi, current->tgid);
		if (vc_data.flags & VX_INFO_NAMESPACE)
			vx_set_namespace(new_vxi,
				current->namespace, current->fs);
		if (vc_data.flags & VX_INFO_NPROC)
			new_vxi->limit.rlim[RLIMIT_NPROC] =
				current->signal->rlim[RLIMIT_NPROC].rlim_max;
		ret = new_vxi->vx_id;
	}
out_put:
	put_vx_info(new_vxi);
	return ret;
}