linux-kernel - Re: [PATCH 4/6] BC: user interface (syscalls)

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Message-ID: <20060823134147.GC10449@martell.zuzino.mipt.ru>
Date:	Wed, 23 Aug 2006 17:41:47 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Kirill Korotaev <dev@...ru>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Pavel Emelianov <xemul@...nvz.org>,
	Andrey Savochkin <saw@...ru>, devel@...nvz.org,
	Rik van Riel <riel@...hat.com>, Andi Kleen <ak@...e.de>,
	Greg KH <greg@...ah.com>, Oleg Nesterov <oleg@...sign.ru>,
	Matt Helsley <matthltc@...ibm.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Chandra Seetharaman <sekharan@...ibm.com>
Subject: Re: [PATCH 4/6] BC: user interface (syscalls)

On Wed, Aug 23, 2006 at 03:06:05PM +0400, Kirill Korotaev wrote:
> --- ./kernel/bc/sys.c.ve3
> +++ ./kernel/bc/sys.c

> +asmlinkage long sys_set_bclimit(uid_t id, unsigned long resource,
> +		unsigned long *limits)

		unsigned long __user *limits

> +{
> +	int error;
> +	unsigned long flags;
> +	struct beancounter *bc;
> +	unsigned long new_limits[2];
> +
> +	error = -EPERM;
> +	if(!capable(CAP_SYS_RESOURCE))
> +		goto out;
> +
> +	error = -EINVAL;
> +	if (resource >= BC_RESOURCES)
> +		goto out;
> +
> +	error = -EFAULT;
> +	if (copy_from_user(&new_limits, limits, sizeof(new_limits)))
> +		goto out;

> +int sys_get_bcstat(uid_t id, unsigned long resource,
> +		struct bc_resource_parm *uparm)

				__user *uparm
> +{
> +	int error;
> +	unsigned long flags;
> +	struct beancounter *bc;
> +	struct bc_resource_parm parm;
> +
> +	error = -EINVAL;
> +	if (resource > BC_RESOURCES)
> +		goto out;
> +
> +	error = -ENOENT;
> +	bc = beancounter_findcreate(id, 0);
> +	if (bc == NULL)
> +		goto out;
> +
> +	spin_lock_irqsave(&bc->bc_lock, flags);
> +	parm = bc->bc_parms[resource];
> +	spin_unlock_irqrestore(&bc->bc_lock, flags);
> +	put_beancounter(bc);
> +
> +	error = 0;
> +	if (copy_to_user(uparm, &parm, sizeof(parm)))
> +		error = -EFAULT;

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