linux-kernel - Re: [PATCH 2/3] netcls_cgroup: introduce cgroup_cls_state->is

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Date:	Mon, 19 Nov 2012 13:54:26 +0100
From:	Daniel Wagner <wagi@...om.org>
To:	Tejun Heo <tj@...nel.org>
CC:	serge.hallyn@...onical.com, ebiederm@...ssion.com,
	nhorman@...driver.com, tgraf@...g.ch, davem@...emloft.net,
	lizefan@...wei.com, cgroups@...r.kernel.org,
	containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] netcls_cgroup: introduce cgroup_cls_state->is_local

Hi Tejun,

On 17.11.2012 04:31, Tejun Heo wrote:
> -static int write_classid(struct cgroup *cgrp, struct cftype *cft, u64 value)
> +static int write_classid(struct cgroup *cgrp, struct cftype *cft,
> +			 const char *buf)
>   {
> +	struct cgroup_cls_state *cs = cgrp_cls_state(cgrp);
> +	s64 v;
> +
> +	if (sscanf(buf, "%lld", &v) != 1)
> +		return -EINVAL;
> +

This changes the user API slightly. cgroup_write_u64() uses 
simple_stroull() to parse the string. simple_stroull() allows to use 
either 0x1234 or 1234 as input. sscanf() will only handle the later type 
of input.

I noticed this because my test script stopped working:

    mkdir /sys/fs/cgroup/net_cls/a
    echo 0x100002 > /sys/fs/cgroup/net_cls/a/net_cls.classid # 10:2

    tc qdisc add dev $DEV root handle 10: htb
    tc class add dev $DEV parent 10: classid 10:2 htb rate 1mbit
    tc qdisc add dev $DEV parent 10:2 handle 20: sfq perturb 10

I am not completely sure if my setup is 100% correct, but at least
it seems to make something :)

cheers,
daniel

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